Noise-induced hearing loss
|Noise-induced hearing loss|
|The international symbol of deafness and hearing loss|
Noise-induced hearing loss (NIHL) is hearing impairment resulting from exposure to loud sound. People may have a loss of perception of a narrow range of frequencies or impaired perception of sound including sensitivity to sound or ringing in the ears. When exposure to hazards such as noise occur at work and is associated with hearing loss, it is referred to as occupational hearing loss.
Hearing may deteriorate gradually from chronic and repeated noise exposure (such as to loud music or background noise) or suddenly from exposure to impulse noise, which is a short high intensity noise (such as a gunshot or airhorn). In both types, loud sound overstimulates delicate hearing cells, leading to the permanent injury or death of the cells. Once lost this way, hearing cannot be restored in humans.
There are a variety of prevention strategies available to avoid or reduce hearing loss. Lowering the volume of sound at its source, limiting the time of exposure and physical protection can reduce the impact of excessive noise. If not prevented, hearing loss can be managed through assistive devices and communication strategies.
The largest burden of NIHL has been through occupational exposures; however, noise-induced hearing loss can also be due to unsafe recreational, residential, social and military service-related noise exposures. It is estimated that 15% of young people are exposed to sufficient leisure noises (i.e. concerts, sporting events, daily activities, personal listening devices, etc.) to cause NIHL. There is not a limited list of noise sources that can cause hearing loss; rather, exposure to excessively high levels from any sound source over time can cause hearing loss.
- 1 Signs and symptoms
- 2 Cause
- 3 Mechanisms
- 4 Diagnosis
- 5 Prevention
- 6 Treatment
- 7 Management
- 8 Epidemiology
- 9 See also
- 10 References
- 11 External links
Signs and symptoms
The first symptom of NIHL may be difficulty hearing a conversation against a noisy background. The effect of hearing loss on speech perception has two components. The first component is the loss of audibility, which may be perceived as an overall decrease in volume. Modern hearing aids compensate this loss with amplification. The second component is known as "distortion" or "clarity loss" due to selective frequency loss. Consonants, due to their higher frequency, are typically affected first. For example, the sounds "s" and "t" are often difficult to hear for those with hearing loss, affecting clarity of speech. NIHL can affect either one or both ears. Unilateral hearing loss causes problems with directional hearing, affecting the ability to localize sound.
Temporary and permanent hearing changes
- PTS (Permanent Threshold Shift) is a permanent change of the hearing threshold (the intensity necessary for one to detect a sound) following an event, which will never recover. PTS is measured in decibels.
- TTS (Temporary Threshold Shift) is a temporary change of the hearing threshold the hearing loss that will be recovered after a few hours to couple of days. Also called auditory fatigue. TTS is also measured in decibels.
In addition to hearing loss, other external symptoms of an acoustic trauma can be:
- Dizziness or vertigo; in the case of vestibular damages, in the inner-ear
Tinnitus is described as hearing a sound when an external sound is not present. Noise-induced hearing loss can cause high-pitched tinnitus. An estimated 50 million Americans have some degree of tinnitus in one or both ears; 16 million of them have symptoms serious enough for them to see a doctor or hearing specialist. As many as 2 million become so debilitated by the unrelenting ringing, hissing, chirping, clicking, whooshing or screeching, that they cannot carry out normal daily activities.
Tinnitus is the largest single category for disability claims in the military, with hearing loss a close second. The third largest category is post-traumatic stress disorder, which itself may be accompanied by tinnitus and may exacerbate it.
Quality of life
NIHL has implications on quality of life that extend beyond related symptoms and the ability to hear. The annual disability-adjusted life years (DALYs) were estimated for noise-exposed U.S. workers. DALYs represent the number of healthy years lost due to a disease or other health condition. They were defined by the 2013 Global Burden of Disease (GBD) Study. The DALYs calculation accounts for life limitations experienced because of hearing loss as a lost portion of a healthy year of life. So the results indicate the number of healthy years lost by a group of people over a specific time period.
NIOSH used DALYs to estimate the impact of hearing loss on quality of life in the CDC Morbidity and Mortality Weekly Report article "Hearing Impairment Among Noise-Exposed Workers in the United States, 2003-2012." It reported that 2.5 healthy years were lost each year for every 1,000 noise-exposed U.S. workers because of hearing impairment (hearing loss that impacts day-to-day activities). These lost years were shared among the 13% of workers with hearing impairment (about 130 workers out of each 1,000 workers). Mining, Construction and Manufacturing workers lost more healthy years than workers in other industry sectors; specifically and respectively in those sectors, 3.5, 3.1 and 2.7 healthy years were lost each year for every 1,000 workers.
The negative impacts of NIHL on one’s ability to reciprocate communication, socialize and interact with society are largely invisible. Hearing loss, in general, is not just an issue of volume; individuals may experience difficulty in understanding what is said over the phone, when several people are talking at once, in a large space, or when the speaker’s face cannot be seen. Subsequently, challenging social interactions can negatively lead to decreased self-esteem, shame, and fear. This can be more acutely felt by those who experience hearing impairment or loss earlier in life, rather than later when it is more socially accepted. Such psychosocial states, regardless of age, can lead to social isolation, which is known to negatively impact one’s overall health and well-being. The compounding impacts can also lead to depression, especially if hearing impairment leads to tinnitus. Research suggests that those with hearing impairment or loss may be at a greater risk for deterioration of quality of life, as captured by a quote from Helen Keller: "Blindness cuts us off from things, but deafness cuts us off from people." Hearing impairment and loss of hearing, regardless of source or age, also limits experiencing the many benefits of sound on quality of life. In addition to the interpersonal social benefits, new studies suggest the effects of nature sounds, such as birds chirping and water, can positively affect an individual’s capacity to recover after being stressed or to increase cognitive focus.
Quality of life questionnaire
Hearing loss is typically quantified by results from an audiogram; however, the degree of loss of hearing does not predict the impact on one’s quality of life. The impact that NIHL can have on daily life and psychosocial function can be assessed and quantified using a validated questionnaire tool, such as the Hearing Handicap Inventory for the Elderly (HHIE). The HHIE is considered a "useful tool for quantifying the perceived emotional and social/situational consequences of hearing loss." The original tool was designed to test adults 65 years of age and older; however, modified versions exist. For adults the Hearing Handicap Inventory for Adults (HHIA) can be used and for adolescents the modified 28-item Hearing Environments And Reflection on Quality of Life (HEAR-QL-28) can be used. The HHIA, for example, is a 25-item questionnaire that asks both social and emotional-specific questions such as: Does a hearing problem cause you to avoid groups of people?" (social) and "Does a hearing problem cause you to feel frustrated when talking to members of your family?" (emotional). Response options are yes, no and sometimes. A greater score indicates greater perceived handicap.
The ear can be exposed to short periods of sound in excess of 120 dB without permanent harm — albeit with discomfort and possibly pain; but long term exposure to sound levels over 85 dB(A) can cause permanent hearing loss.
There are two basic types of NIHL:
- NIHL caused by acoustic trauma and
- gradually developing NIHL.
Acute acoustic trauma
NIHL caused by acute acoustic trauma refers to permanent cochlear damage from a one-time exposure to excessive sound pressure. This form of NIHL commonly results from exposure to high-intensity sounds such as explosions, gunfire, a large drum hit loudly, and firecrackers. According to one US study, excessive noise levels in cinemas are sufficiently brief that movie-goers do not experience hearing loss.
Perceived harmfulness vs. actual harmfulness
The discomfort threshold is the loudness level from which a sound starts to be felt as too loud and thus painful by an individual. Industry workers tend to have a higher discomfort threshold (i.e. the sounds must be louder to feel painful than for non-industry workers), but the sound is just as harmful to their ears. Industry workers often suffer from NIHL because the discomfort threshold is not a relevant indicator of the harmfulness of a sound.
Gradually developing NIHL refers to permanent cochlear damage from repeated exposure to loud sounds over a period of time. Unlike acoustic trauma, this form of NIHL does not occur from a single exposure to a high-intensity sound pressure level. Gradually developing NIHL can be caused by multiple exposures to excessive noise in the workplace or any source of repetitive, frequent exposures to sounds of excessive volume, such as home and vehicle stereos, concerts, nightclubs, and personal media players.
About 22 million workers are exposed to hazardous noise, with additional millions exposed to solvents and metals that could put them at increased risk for hearing loss. Occupational hearing loss is one of the most common occupational diseases. 49% of male miners have hearing loss by the age of 50. By the age of 60, this number goes up to 70%. Construction workers also suffer an elevated risk. A screening program focused on construction workers employed at US Department of Energy facilities found 58% with significant abnormal hearing loss due to noise exposures at work. Occupational hearing loss is present in up to 33% of workers overall. Occupational exposure to noise causes 16% of adult disabling hearing loss worldwide.
The following is a list of occupations that are most susceptible to hearing loss:
- Orchestra conductors
Musicians, from classical orchestras to rock groups, are exposed to high decibel ranges. Some rock musicians experience noise-induced hearing loss from their music, and some studies have found that "symphonic musicians suffer from hearing impairment and that the impairment might be ascribed to symphonic music."
Music-induced hearing loss is still a controversial topic for hearing researchers. While some population studies have shown that the risk for hearing loss increases as music exposure increases, other studies found little to no correlation between the two. Experts at the 2006 "Noise-Induced Hearing Loss in Children at Work and Play" Conference agreed that further research into this field was still required before making a broad generalization about music-induced hearing loss.
Given the extensive research suggesting that industrial noise exposure can cause sensorineural hearing loss, a link between hearing loss and music exposures of similar level and duration (to industrial noise) seems highly plausible. Determining which individuals or groups are at risk for such exposures may be a difficult task. Despite concerns about the proliferation of personal music players, the there is only scarce evidence supporting their impact on hearing loss, and some small-sample studies suggest that only a fraction of users are affected. People from ages to 6–19 have an approximately 15% rate of hearing loss. Recommendations for musicians to protect their hearing were released in 2015 by NIOSH. The recommendations emphasized education of musicians and those who work in or around the music industry. Annual hearing assessments were also recommended to monitor thresholds as were sound level assessments to help determine the amount of time musicians and related professionals should spend in that environment. Hearing protection was also recommended, and the authors of the NIOSH recommendations even suggested that musicians consider custom earplugs as a way to combat NIHL. Despite these recommendations, musicians continue to face unique challenges in protecting their hearing when compared to individuals in industrial settings. Typically environmental controls are the first line of defense in a hearing conservation program, and depending on the type of musicians some recommendations have been set in place. These recommendations can include adjusting risers or level of the speakers and adjusting the layout of a band or orchestra. These changes in the environment can be beneficial to musicians, but the ability to accomplish them is not always possible. In the cases where these changes cannot be made, hearing protection is recommended. Hearing protection in musicians offers its own sets of benefits and complications. When used properly, hearing protection can limit the exposure of noise in individuals. Musicians have the ability to pick from several different types of hearing protection from conventional ear plugs to custom or high fidelity hearing protection. Despite this, use of hearing protection among musicians is low for several different reasons. Musicians often feel that hearing protective devices can distort how music sounds or makes it too quiet for them to hear important cues which makes them less likely to wear hearing protection even when aware of the risks. Research suggests that educations programs can be beneficial to musicians as well as working with hearing care professionals to help address the specific issues that musicians face.
In 2018, a musician named Chris Goldscheider won a case against Royal Opera House for damaging his hearing in a rehearsal of Wagner's thunderous opera Die Walkure.
In the United States, the Occupational Safety and Health Administration (OSHA) describes standards for occupational noise exposure in articles 1910.95 and 1926.52. OSHA states that an employer must implement hearing conservation programs for employees if the noise level of the workplace is equal to or above 85 dB(A) for an averaged eight-hour time period. OSHA also states that "exposure to impulsive or impact noise should not exceed 140 dB peak sound pressure level". The National Institute for Occupational Safety and Health (NIOSH) recommends that all worker exposures to noise should be controlled below a level equivalent to 85 dBA for eight hours to minimize occupational noise induced hearing loss. NIOSH also recommends a 3 dBA exchange rate so that every increase by 3 dBA doubles the amount of the noise and halves the recommended amount of exposure time. The United States Department of Defense (DoD) instruction 605512 has some differences from OSHA 1910.95 standard, for example, OSHA 1910.95 uses a 5 dB exchange rate and DoD instruction 605512 uses a 3 dB exchange rate.
There are programs that seek to increase compliance and therefore effectiveness of hearing protection rules; the programs include the use of hearing tests and educating people that loud sound is dangerous
Employees are required to wear hearing protection when it is identified that their eight-hour time weighted average (TWA) is above the exposure action value of 90 dB. If subsequent monitoring shows that 85 dB is not surpassed for an eight-hour TWA, the employee is no longer required to wear hearing protection.
In the European Union, directive 2003/10/EC mandates that employers shall provide hearing protection at noise levels exceeding 80 dB(A), and that hearing protection is mandatory for noise levels exceeding 85 dB(A). Both values are based on 8 hours per day, with a 3 dB exchange rate.
Several sports stadiums pride themselves in having louder stadiums than their opponents because it may create a more difficult environment for opposing teams to play in. Currently, there are few studies on noise in sports stadiums, but some preliminary measurements show noise levels reaching 120 dB, and informal studies suggest that people may receive up to a 117% noise dose in one game. There are many challenges that face hearing conservationists such as sports culture. Sports fans will create noise in an attempt to distract other teams, and some sports teams have been known to create artificial noise in an attempt to make the stadium louder. In doing that, workers, teams, and fans may be at potential risk for damage to the auditory system.
NIOSH conducted a health hazard evaluation and studies at Monster Trucking and Stock Car racing events, spectators average noise levels ranged from 95 to 100 dBA at the Monster Truck event and over 100 dBA at the stock car racing event. NIOSH researchers also published noise exposure levels for drivers, crew members, and staff. Noise levels at the Bristol Motor Speedway ranged from 96 dBA in the stands to 114 dBA for a driver inside a car during practice. Peak noise levels in the Pit area reached or exceeded 130 dB SPL, a level often associated with human hearing threshold for pain. Several prominent NASCAR drivers have complete or partial hearing loss and other symptoms from their many years of exposure.
During the FIFA World Cup in 2010, noise levels created by fans blowing Vuvuzela averaged 131 dBA at the horn opening and 113 dBA at 2 meter distance. Peak levels reached 144 dB SPL, louder than a jet engine at takeoff.
A study of occupational and recreational noise exposure at indoor hockey arenas found noise levels from 81 dBA to 97 dBA, with peak sound pressure levels ranging from 105 dB SPLto 124 dB SPL. Another study examined the hearing threshold of hockey officials and found mean noise exposures of 93 dBA. Hearing threshold shifts were observed in 86% of the officials (25/29).
In a study of noise levels at 10 intercollegiate basketball games showed noise levels in 6 of the 10 basketball games to exceed the national workplace noise exposure standards, with participants showing temporary threshold levels at one of the games.
While there is no agency that currently monitors sports stadium noise exposure, organizations such as NIOSH or OSHA use occupational standards for industrial settings that some experts feel could be applied for those working at sporting events. Workers often will not exceed OSHA standards of 90 dBA, but NIOSH, whose focus is on best practice, has stricter standards which say that when exposed to noise at or exceeding 85 dBA workers need to be put on a hearing conservation program. Workers may also be at risk for overexposure because of impact noises that can cause instant damage. Experts are suggesting that sports complexes create hearing conservation programs for workers and warn fans of the potential damage that may occur with their hearing.
Studies are still being done on fan exposure, but some preliminary findings show that there are often noises that can be at or exceed 120 dB which, unprotected, can cause damage to the ears in seconds.
NIHL occurs when too much sound intensity is transmitted into and through the auditory system. An acoustic signal from a sound source, such as a radio, enters into the external auditory canal (ear canal), and is funneled through to the tympanic membrane (eardrum), causing it to vibrate. The vibration of the tympanic membrane drives the middle ear ossicles, the malleus, incus, and stapes to vibrate in sync with the eardrum. The middle ear ossicles transfer mechanical energy to the cochlea by way of the stapes footplate hammering against the oval window of the cochlea, effectively amplifying the sound signal. This hammering causes the fluid within the cochlea (perilymph and endolymph) to be displaced. Displacement of the fluid causes movement of the hair cells (sensory cells in the cochlea) and an electrochemical signal to be sent from the auditory nerve (CN VIII) to the central auditory system within the brain. This is where sound is perceived. Different groups of hair cells are responsive to different frequencies. Hair cells at or near the base of the cochlea are most sensitive to higher frequency sounds while those at the apex are most sensitive to lower frequency sounds. There are two known biological mechanisms of NIHL from excessive sound intensity: damage to the structures called stereocilia that sit atop hair cells and respond to sound, and damage to the synapses that the auditory nerve makes with hair cells, also termed "hidden hearing loss".
The symptoms mentioned above are the external signs of the physiological response to cochlear overstimulation. Here are some elements of this response:
- Damaged sensory hairs (stereocilia) of the hair cells; damaged hair cells degenerate and die. In humans and other mammals, dead hair-cells are never replaced; the resulting hearing loss is permanent.
- Inflammation of the exposed areas. This inflammation causes poor blood flow in the exposed blood vessels (vascular stasis), and poor oxygen supply for the liquid inside the cochlea (endolymphatic hypoxia) Those noxious conditions worsen the damaged hair cell degeneration.
- Synaptic damages, by excitotoxicity. Noise over-stimulation causes an excessive release of glutamate, causing the postsynaptic bouton to swell and burst. However the neuron connection can be repaired, and the hearing loss only caused by the "wiring" (i.e. excitotoxicity) can thus be recovered within 2–3 days.
Hair cell damage or death
When the ear is exposed to excessive sound levels or loud sounds over time, the overstimulation of the hair cells leads to heavy production of reactive oxygen species, leading to oxidative cell death. In animal experiments, antioxidant vitamins have been found to reduce hearing loss even when administered the day after noise exposure. They were not able to fully prevent it. Damage ranges from exhaustion of the hair (hearing) cells in the ear to loss of those cells. NIHL is therefore the consequence of overstimulation of the hair cells and supporting structures. Structural damage to hair cells (primarily the outer hair cells) will result in hearing loss that can be characterized by an attenuation and distortion of incoming auditory stimuli.
During hair cell death ‘scars’ develop, which prevent potassium rich fluid of the endolymph from mixing with the fluid on the basal domain. The potassium rich fluid is toxic to the neuronal endings and can damage hearing of the entire ear. If the endolymph fluid mixes with the fluid on the basal domain the neurons become depolarized, causing complete hearing loss. In addition to complete hearing loss, if the area is not sealed and leakage continues further tissue damage will occur. The ‘scars’ that form to replace the damaged hair cell are caused by supporting hair cells undergoing apoptosis and sealing the reticular lamina, which prevents fluid leakage. The cell death of two supporting hair cells rapidly expands their apical domain, which compresses the hair cell beneath its apical domain.
Recent studies have investigated additional mechanisms of NIHL involving delayed or disabled electrochemical transmission of nerve impulses from the hair cell to and along the auditory nerve. In cases of extreme acute acoustic trauma, a portion of the postsynaptic dendrite (where the hair cell transfers electrochemical signals to the auditory nerve) can rupture from overstimulation, temporarily stopping all transmission of auditory input to the auditory nerve. This is known as excitotoxicity. Usually, this sort of rupture heals within about five days, resulting in functional recovery of that synapse. While healing, an over-expression of glutamate receptors can result in temporary tinnitus, or ringing in the ears. Repeated ruptures at the same synapse may eventually fail to heal, leading to permanent hearing loss.
Prolonged exposure to high intensity noise has also been linked to the disruption of ribbon synapses located in the synaptic cleft between inner hair cells and spiral ganglion nerve fibers, leading to a disorder referred to as cochlear synaptopathy or hidden hearing loss. This disorder is cumulative and over time, leads to degeneration of the spiral ganglion cells of the inner ear and overall dysfunction in the neural transmission between auditory nerve fibers and the central auditory pathway. The most common symptom of cochlear synaptopathy is difficulty understanding speech, especially in the presence of competing noise. However, this type of hearing impairment is often undetectable by conventional pure tone audiometry, thus the name "hidden" hearing loss.
Acoustic over-exposure can also result in decreased myelination at specific points on the auditory nerve. Myelin, an insulating sheath surrounding nerve axons, expedites electrical impulses along nerves throughout the nervous system. Thinning of the myelin sheath on the auditory nerve significantly slows the transmission of electrical signals from hair cell to auditory cortex, reducing comprehension of auditory stimuli by delaying auditory perception, particularly in noisy environments.
Individual susceptibility towards noise
There appear to be large differences in individual susceptibility to NIHL. The following factors have been implicated:
- missing acoustic reflex
- previous sensorineural hearing loss
- a bad general health state: bad cardiovascular function, insufficient intake of oxygen, a high platelet aggregation rate; and most importantly, a high viscosity of the blood
- cigarette smoking
- exposure to ototoxic chemicals (medication or environmental chemicals that can damage the ear), including certain solvents and heavy metals
- type 2 diabetes
Both NIHL caused by acoustic trauma and gradually-developed-NIHL can often be characterized by a specific pattern presented in audiological findings. NIHL is generally observed to decrease hearing sensitivity in the higher frequencies, also called an audiometric notch, especially at 4000 Hz, but sometimes at 3000 or 6000 Hz. The symptoms of NIHL are usually presented equally in both ears.
This typical 4000 Hz notch is due to the transfer function of the ear. As does any object facing a sound, the ear acts as a passive filter, although the inner ear is not an absolute passive filter because the outer hair cells provide active mechanisms. A passive filter is a low pass: the high frequencies are more absorbed by the object because high frequencies impose a higher pace of compression-decompression to the object. The high frequency harmonics of a sound are more harmful to the inner-ear.
However, not all audiological results from people with NIHL match this typical notch. Often a decline in hearing sensitivity will occur at frequencies other than at the typical 3000–6000 Hz range. Variations arise from differences in people's ear canal resonance, the frequency of the harmful acoustic signal, and the length of exposure. As harmful noise exposure continues, the commonly affected frequencies will broaden to lower frequencies and worsen in severity.
NIHL can be prevented through the use of simple, widely available, and economical tools. This includes but is not limited to personal noise reduction through the use of ear protection (i.e. earplugs and earmuffs), education, and hearing conservation programs. For the average person, there are three basic things that one can do to prevent NIHL: turn down the volume on devices, move away from the source of noise, and wear hearing protectors in loud environments.
Non-occupational noise exposure is not regulated or governed in the same manner as occupational noise exposure; therefore prevention efforts rely heavily on education awareness campaigns and public policy. The WHO cites that nearly half of those affected by hearing loss could have been prevented through primary prevention efforts such as: "reducing exposure (both occupational and recreational) to loud sounds by raising awareness about the risks; developing and enforcing relevant legislation; and encouraging individuals to use personal protective devices such as earplugs and noise-cancelling earphones and headphones."
Personal noise reduction devices
Personal noise reduction devices can be passive, active or a combination. Passive ear protection includes earplugs or earmuffs which can block noise up to a specific frequency. Earplugs and earmuffs can provide the wearer with 10 dB to 40 dB of attenuation. However, use of earplugs is only effective if the users have been educated and use them properly; without proper use, protection falls far below manufacturer ratings. Higher consistency of performance has been found with custom-molded earplugs. Because of their ease of use without education, and ease of application or removal, earmuffs have more consistency with both compliance and noise attenuation. Active ear protection (electronic pass-through hearing protection devices or EPHPs) electronically filter out noises of specific frequencies or decibels while allowing the remaining noise to pass through. A personal attenuation rating can be objectively measured by using a hearing protection fit testing system.
Education is key to prevention. Before hearing protective actions will take place, a person must understand they are at risk for NIHL and know their options for prevention. Hearing protection programs have been hindered by people not wearing the protection for various reasons, including the desire to converse, uncomfortable devices, lack of concern about the need for protection, and social pressure against wearing protection. Although youth are at risk for hearing loss, one study found that 96.3% of parents did not believe their adolescents were at risk, and only 69% had talked to their children about hearing protection; those aware of NIHL risks were more likely to talk to their teens.
A systematic review of the effectiveness of interventions to promote the use of hearing protection devices such as earplugs and earmuffs among workers found that tailored interventions improve the average use of such devices when compared with no intervention. Tailored interventions involve the use of communication or other types of interventions that are specific to an individual or a group and aim to change behavior. Mixed interventions such as mailings, distribution of hearing protection devices, noise assessments, and hearing testing are also more effective in improving the use of hearing protection devices compared with hearing testing alone. Programs that increased the proportion of workers wearing hearing protection equipment did reduce overall hearing loss.
Personal listening devices
Although research is limited, it suggests that increased exposure to loud noise through personal listening devices is a risk factor for noise induced hearing loss. More than half of people are exposed to sound through music exposure on personal devices greater than recommended levels. Research suggests stronger correlations between extended duration or elevated usage of personal listening devices and hearing loss.
Hearing conservation programs
Workers in general industry who are exposed to noise levels above 85 dBA are required by the Occupational Safety and Health Administration (OSHA) to be in a hearing conservation program (HCP), which includes noise measurement, noise control, periodic audiometric testing, hearing protection, worker education, and record keeping. Twenty-four states, Puerto Rico, and the U.S. Virgin Islands have OSHA-approved state plans and have adopted their own standards and enforcement policies. Most of these state standards are identical to those of federal OSHA. However, some states have adopted different standards or may have different enforcement policies. Most health and safety regulations are designed to keep damage risk within "acceptable limits" — that is, some people are likely to incur a hearing loss even when exposed to less than the maximum daily amount of noise specified in a regulation. Hearing conservation programs in other arenas (schools, military) have become more common, and it has been established that unsafe listening behaviors, such as listening to loud noise for extended periods of time without protection, persist despite knowledge of potential hearing loss effects.
However, it is understood that HCPs are designed to change behavior, which is known to be a complex issue that requires a multi-faceted approach. According to Keppler et al. in their 2015 study of such programming, they cite the necessary attitude change towards the susceptibility of risk and degree of severity of hearing loss. Among young adults, the concept of severity is most crucial because it has been found that behavior change may not occur unless an individual experiences NIHL or similarly related NIHL tinnitus, furthering warranting a multi-pronged approach based on hearing conservation programming and education.
Interventions to prevent noise-induced hearing loss often have many components. A 2017 Cochrane review found that hearing loss prevention programs suggest that stricter legislation might reduce noise levels. Giving workers information on their noise exposure levels by itself was not shown to decrease exposure to noise. Ear protection, if used correctly, has the potential to reduce noise to safer levels, but does not necessarily prevent hearing loss. External solutions such as proper maintenance of equipment can lead to noise reduction, but further study of this issue under real-life conditions is needed. Other possible solutions include improved enforcement of existing legislation and better implementation of well-designed prevention programmes, which have not yet been proven conclusively to be effective. The implications is that further research could affect conclusions reached.
Several hearing conservation programs have been developed to educate a variety of audiences about the dangers of NIHL and how to prevent it. Dangerous Decibels aims to significantly reduce the prevalence of noise induced hearing loss and tinnitus through exhibits, education and research. We’re hEAR for You is a small non-profit that distributes information and ear plugs at concert and music festival venues. The Buy Quiet program was created to combat occupational noise exposures by promoting the purchase of quieter tools and equipment and encourage manufacturers to design quieter equipment. The National Institute on Deafness and Other Communication Disorders developed the It's a Noisy Planet. Protect their Hearing educational campaign to inform preteens, parents, and educators about the causes and prevention of NIHL. The National Institute for Occupational Safety and Health partnered with the National Hearing Conservation Association in 2007 to establish the Safe-in-Sound Excellence and Innovation in Hearing Loss Prevention Awards to recognize organizations that are successfully implementing hearing loss prevention concepts into their daily routines.
Medications are still being researched to determine if they can prevent NIHL. No medication has been proven to prevent or repair NIHL in humans.
There is evidence that hearing loss can be minimized by taking high doses of magnesium for a few days, starting as soon as possible after exposure to the loud noise. A magnesium-high diet also seems to be helpful as an NIHL-preventative if taken in advance of exposure to loud noises. Consuming sizable amounts of magnesium can be potentially harmful, so this treatment should be followed with caution.
Sound or stress training
Despite different people having different thresholds for what noises are painful, this pain threshold had no correlation with which noises cause hearing damage. The ear can not get more resistant to noise harmfulness by training it to noise. The cochlea is partially protected by the acoustic reflex, but being frequently exposed to noise does not lower the reflex threshold. It had been observed that noise conditioning (i.e. exposure to loud non-traumatizing noise) several hours prior to the exposure to traumatizing sound level, significantly reduced the damages inflicted to the hair-cells. The same "protective effect" was also observed with other stressors such as heat-shock conditioning and stress (by restraint) conditioning. This “protective effect" only happens if the traumatizing noise is presented within an optimum interval of time after the sound-conditioning session (-24 hours for a 15 min. sound-conditioning; no more protection after 48 hours). This "protective effect" had long been thought to involve the active mechanisms of the outer hair cells and the efferent system commanding them. The contractile effect of the outer hair cells, activated by the efferent nervous system has been proven to provide a protective effect against acoustic trauma.
However, a 2006 study revealed a different protective mechanism for stress conditioning. The study revealed that the stressor (sound, heat, or stress) conditioning increases the receptibility to glucocorticoid, a kind of anti-inflammatory hormone. The effects of glucocorticoid thus mitigate the inflammation from an acoustic trauma that can lead to hearing loss. In fact, high doses of corticoids are often prescribed by physicians after an acoustic-trauma in order to mitigate the inflammatory response.
Summarized, sound (or other stressor) conditioning is a pre-emptive medication against cochlea inflammation. It does not make the ear more resistant to noise. It reduces the inflammation caused by the acoustic trauma, which would cause subsequent damages to hair cells. While an anti-inflammatory medication would increase the quantity of anti-inflammatory hormone in the whole body, noise conditioning increases the number of receptors for the anti-inflammatory hormone, and only in the areas where it is much needed (i.e. cochlea).
- stressor (noise, heat shock or stress) conditioning activates hormonal glands: the HPA axis. Note that the HPA axis is associated to the immune system
- this HPA axis activation results in the up regulation of glucocorticoid receptors (GR) in the cochlea and the paraventricular nucleus (PVN) of the hypothalamus. Note that the glucocorticoid hormone is a kind of immune-reaction-inhibitor, including the inflammation reaction.
- This up regulation of GR thus prevents GR down regulation induced by acoustic trauma
- The protective effect of noise-conditioning is blocked by adrenalectomy or pharmacological treatment with RU486 + metyrapone (a glucocorticoid receptor antagonist).
Treatment options that offer "cures" for NIHL are under research and development. Currently there are no commonly used cures, but rather assistive devices and therapies to try and manage the symptoms of NIHL.
Acute acoustic trauma
Several clinical trials have been conducted to treat temporary NIHL occurring after a traumatic noise event, such as a gunshot or firework. In 2007, individuals with acute acoustic trauma after firecracker exposure were injected intratympanically with a cell permeable ligand, AM-111. The trial found AM-111 to have a therapeutic effect on at least two cases of those with acute trauma. Treatment with a combination of prednisolone and piracetam appeared to rescue patients with acute trauma after exposure to gunshots. However, those who received the treatment within an hour of exposure had higher rates of recovery and significantly lower threshold shifts compared to those who received treatment after one hour.
Additionally, clinical trials using antioxidants after a traumatic noise event to reduce reactive oxygen species have displayed promising results. Antibiotic injections with allopurinol, lazaroids, α-D-tocopherol, and mannitol were found to reduce the threshold shift after noise exposure. Another antioxidant, Ebselen, has been shown to have promising results for both TTS and PTS. Ebselen mimics gluthathione peroxide, an enzyme that has many functions, including scavenging hydrogen peroxide and reactive oxygen species. After noise exposure, gluthathione peroxide decreases in the ear. An oral administration of ebselen in both preclinical tests on guinea pigs and human trials indicate that noise induced TTS and PTS was reduced.
Recently, combination therapy with hyperbaric oxygen therapy (HBO) and corticosteroids has been found to be effective for acute acoustic trauma. Acute noise exposure causes inflammation and lower oxygen supply in the inner ear. Corticosteroids hinder the inflammatory reaction and HBO provides an adequate oxygen supply. This therapy has been shown to be effective when initiated within three days after acoustic trauma. Therefore, this condition is considered an ENT emergency.
Gradually occurring NIHL
At the present time, no established clinical treatments exist to reverse the effects of permanent NIHL. However, current research for the possible use of drug and genetic therapies look hopeful. In addition, management options such as hearing aids and counseling exist.
Many studies have been conducted looking at regeneration of hair cells in the inner ear. While hair cells are generally not replaced through cell regeneration, mechanisms are being studied to induce replacement of these important cells. One study involves the replacement of damaged hair cells with regenerated cells, via the mechanism of gene transfer of atonal gene Math1 to pluripotent stem cells within the inner ear. Other atonal genes are being studied to induce regeneration of hair cells in the inner ear.
For people living with NIHL, there are several management options that can improve the ability to communicate. These options include counseling, amplification, and other assisted listening devices, such as frequency modulation (FM) systems. FM systems can enhance the use of hearing aids and overcome the effects of poor listening conditions because the signal is sent from the microphone worn by the speaker directly to the listener. The prognosis has improved with the recent advancements in digital hearing aid technology, such as directional microphones, open-fit hearing aids, and more advanced algorithms. Hearing aids can mask or cover up the tinnitus, and many with hearing loss and tinnitus find relief by using hearing aids. Though there is no cure or agreed-upon treatment for tinnitus, some drugs have been shown to provide temporary reduction of tinnitus. Other treatments for tinnitus include cognitive-behavioral therapy, biofeedback, and electrical stimulation. Annual audiological evaluations are recommended to monitor any changes in a patient's hearing and to modify hearing-aid prescriptions.
A systematic-review conducted by the American Academy of Audiology Task Force On the Health-Related Quality of Life Benefits of Amplification in Adults found the use of hearing aids to increase quality of life. The review pertained to adults who experienced sensorineural hearing loss, which can be caused by excessive, loud noise.
The World Health Organization estimates that nearly 360 million people have moderate to profound hearing loss from all causes. Rates of hearing loss has traditionally been attributed to occupational or firearm-related exposure, as well as recreational exposure. The World Health Organization estimated in 2015 that 1.1 billion young people are at risk for hearing loss caused by unsafe listening practices. The over-exposure to excessive loud noise is partially attributed to recreational exposure, such as the use of personal audio devices with music at high volumes for long durations, or social settings such as bars, entertainment and sporting events.
While there is no perfect way to pinpoint hearing loss from excessive noise, researchers look for audiometric notches in a hearing test—dips in the ability to hear certain frequencies—as signs of possible NIHL. As of 2011 data, approximately 24% adults age 20-69 in the United States has an audiometric notch. This data identified differences in NIHL based on age, gender, race/ethnicity, and whether or not a person is exposed to noise at work. Among people aged 20–29, 19.2% had an audiometric notch, compared to 27.3% of people aged 50–59. Males in general had a notch more often than females, regardless of occupational noise exposure, for both unilateral and bilateral audiometric notches. An epidemiological study of 6557 automotive manufacturing workers in China (median age 28 years old) reported that in 62% of the settings where noise exposures were evaluated, levels exceeded the recommended level of 85 dBA. The prevalence of hearing loss was 41% among auto part manufacturing workers, followed by 31% of power train workers and 24% in automotive manufacturing. Across job categories, the highest prevalence rate was observed among welders, of 53%. The prevalance rates were associted with noise levels and the workers' cumulative noise exposure.
Occupational noise exposure is a risk factor for noise induced hearing loss. One study examined hearing test results obtained between 2000-2008 for workers ages 18–65 who had a higher occupational noise exposure than the average worker. Of the sample taken, 18% of the workers had hearing loss. Of the occupations considered, the Mining industry had the highest prevalence and risk of hearing loss, at approximately 27%. Other industries with a higher prevalence and risk included Construction (23.48%) and Manufacturing, especially Wood Product and Non-metallic Mineral Product (19.89%), Apparel (20.18%), and Machinery (21.51%). Estimates of rates of hearing loss have been reported for workers in the Agriculture, Forestry, Fishing, and Hunting (AFFH) sector. The overall prevalence of hearing loss (defined as a pure‐tone average threshold across frequencies 1000, 2000, 3000, and 4000 Hz of 25 dB or more in either ear) was 15% but that rate was exceeded in several of the subsectors of those industries. Prevalences were highest among workers in Forest Nurseries and Gathering of Forest Products at 36% and Timber Tract Operations at 22%. The Aquaculture sub‐sector had the highest adjusted risk (adjusted probability ratio of 1.7) of all sub‐sectors of the Agriculture, Forestry, Fishing, and Hunting industries. The same methodology was used to estimate the prevalence of hearing loss for noise-exposed U.S. workers within the Health Care and Social Assistance sector. The prevalence of hearing loss in the Medical Laboratories subsector was 31% and in the Offices of All Other Miscellaneous Health Practitioners subsector was 24%. The Child Day Care Services subsector had a 52% higher risk than the reference industry.While the overall HSA sector prevalence for hearing loss was 19%, the prevalence in the Medical Laboratories subsector and the Offices of All Other Miscellaneous Health Practitioners subsector were 31% and 24%, respectively. The Child Day Care Services subsector had a 52% higher risk than the reference industry of workers who are not exposed to noise at work (Couriers and Messengers).
- Sensorineural hearing loss
- Auditory fatigue
- Health effects from noise
- Hearing aid
- Hearing loss
- Hearing protection fit testing
- Occupational hearing loss
Organizations and awareness-raising initiatives
- Don't Lose The Music
- Safe-In-Sound Award
- Youth hearing conservation programs
- Hearing conservation program
Noise from power sources
- Alberti PW (February 1992). "Noise induced hearing loss". BMJ. 304 (6826): 522. doi:10.1136/bmj.304.6826.522. PMC 1881413. PMID 1559054.
- National Institute for Occupational Safety and Health, CDC (1996). Preventing Occupational Hearing Loss - A Practical Guide. Cincinnati: DHHS- 96-110. pp. iii.
- Henderson D, Hamernik RP, Dosanjh DS, Mills JH (1976). Noise-induced hearing loss. New York: Raven. pp. 41–68.
- "CDC - Engineering Noise Control - NIOSH Workplace Safety and Health Topic". www.cdc.gov. 5 February 2018.
- Saunders GH, Griest SE (2009). "Hearing loss in veterans and the need for hearing loss prevention programs". Noise & Health. 11 (42): 14–21. doi:10.4103/1463-1741.45308. PMID 19265249.
- Carter L, Williams W, Black D, Bundy A (2014). "The leisure-noise dilemma: hearing loss or hearsay? What does the literature tell us?". Ear and Hearing. 35 (5): 491–505. doi:10.1097/01.aud.0000451498.92871.20. PMID 25144250.
- Agius B. "Noise induced hearing loss". Health, Work & Environment.
- Phatak SA, Yoon YS, Gooler DM, Allen JB (November 2009). "Consonant recognition loss in hearing impaired listeners". The Journal of the Acoustical Society of America. 126 (5): 2683–94. Bibcode:2009ASAJ..126.2683P. doi:10.1121/1.3238257. PMC 2787079. PMID 19894845.
- Lowth M (2013). "Hearing Problems". Patient.
- Temmel AF, Kierner AC, Steurer M, Riedl S, Innitzer J (November 1999). "Hearing loss and tinnitus in acute acoustic trauma". Wiener Klinische Wochenschrift. 111 (21): 891–3. PMID 10599152.
- Axelsson A, Hamernik RP (January 1987). "Acute acoustic trauma". Acta Oto-Laryngologica. 104 (3–4): 225–33. doi:10.3109/00016488709107322. PMID 3673553.
- Raghunath G, Suting LB, Maruthy S (July 2012). "Vestibular symptoms in factory workers subjected to noise for a long period" (PDF). The International Journal of Occupational and Environmental Medicine. 3 (3): 136–44. PMID 23022863.
- Levine RA, Oron Y (2015). Tinnitus. Handbook of Clinical Neurology. 129. pp. 409–31. doi:10.1016/B978-0-444-62630-1.00023-8. ISBN 9780444626301. PMID 25726282.
- LaMarte, Frank P.; Tyler, Richard S. (September 1987). "Noise-Induced Tinnitus". AAOHN Journal. 35 (9): 403–406. doi:10.1177/216507998703500905. ISSN 0891-0162.
- Adoga AA, Obindo TJ (2013). The Association between tinnitus and mental illness, mental disorders - Theoretical and Empirical Perspectives. InTech. ISBN 978-953-51-0919-8.
- US Department of Veterans Affairs. "New Treatment Options for Tinnitus Sufferers".
- Masterson EA, Bushnell PT, Themann CL, Morata TC (April 2016). "Hearing Impairment Among Noise-Exposed Workers - United States, 2003-2012". MMWR. Morbidity and Mortality Weekly Report. 65 (15): 389–94. doi:10.15585/mmwr.mm6515a2. PMID 27101435.
- Global Burden of Disease Study 2013 Collaborators (August 2015). "Global, regional, and national incidence, prevalence, and years lived with disability for 301 acute and chronic diseases and injuries in 188 countries, 1990-2013: a systematic analysis for the Global Burden of Disease Study 2013". Lancet. 386 (9995): 743–800. doi:10.1016/s0140-6736(15)60692-4. PMC 4561509. PMID 26063472.
- Dewane C (2010). "Hearing loss in older adults- its effect on mental health". Social Work Today. 10 (4): 18.
- Tambs K (2004). "Moderate effects of hearing loss on mental health and subjective well-being: results from the Nord-Trøndelag Hearing Loss Study". Psychosomatic Medicine. 66 (5): 776–82. CiteSeerX 10.1.1.561.5850. doi:10.1097/01.psy.0000133328.03596.fb. PMID 15385706.
- Hawton A, Green C, Dickens AP, Richards SH, Taylor RS, Edwards R, Greaves CJ, Campbell JL (February 2011). "The impact of social isolation on the health status and health-related quality of life of older people". Quality of Life Research. 20 (1): 57–67. doi:10.1007/s11136-010-9717-2. PMID 20658322.
- Chen J, Liang J, Ou J, Cai W (July 2013). "Mental health in adults with sudden sensorineural hearing loss: an assessment of depressive symptoms and its correlates". Journal of Psychosomatic Research. 75 (1): 72–4. doi:10.1016/j.jpsychores.2013.03.006. PMID 23751242.
- Gopinath B, Schneider J, Hickson L, McMahon CM, Burlutsky G, Leeder SR, Mitchell P (June 2012). "Hearing handicap, rather than measured hearing impairment, predicts poorer quality of life over 10 years in older adults". Maturitas. 72 (2): 146–51. doi:10.1016/j.maturitas.2012.03.010. PMID 22521684.
- Hearing Loss Association of America. "Hearing Loss and relationships". Hearing Loss Association of America.
- Alvarsson JJ, Wiens S, Nilsson ME (March 2010). "Stress recovery during exposure to nature sound and environmental noise". International Journal of Environmental Research and Public Health. 7 (3): 1036–46. doi:10.3390/ijerph7031036. PMC 2872309. PMID 20617017.
- Ratcliffe E, Gatersleben B, Sowden PT (2013). "Bird sounds and their contributions to perceived attention restoration and stress recovery". Journal of Environmental Psychology. 36: 221–228. doi:10.1016/j.jenvp.2013.08.004.
- Newman CW, Weinstein BE, Jacobson GP, Hug GA (December 1990). "The Hearing Handicap Inventory for Adults: psychometric adequacy and audiometric correlates". Ear and Hearing. 11 (6): 430–3. doi:10.1097/00003446-199012000-00004. PMID 2073976.
- Newman CW, Weinstein BE, Jacobson GP, Hug GA (October 1991). "Test-retest reliability of the hearing handicap inventory for adults". Ear and Hearing. 12 (5): 355–7. doi:10.1097/00003446-199110000-00009. PMID 1783240.
- Rachakonda T, Jeffe DB, Shin JJ, Mankarious L, Fanning RJ, Lesperance MM, Lieu JE (February 2014). "Validity, discriminative ability, and reliability of the hearing-related quality of life questionnaire for adolescents". The Laryngoscope. 124 (2): 570–8. doi:10.1002/lary.24336. PMC 3951892. PMID 23900836.
- "Hearing Handicap Inventory for Adults (HHIA)" (PDF). Academy of Doctors of Audiology. Retrieved 12 December 2017.
- "Criteria for a Recommended Standard: Occupational Noise Exposure". www.cdc.gov/niosh. 1998. doi:10.26616/NIOSHPUB98126. Retrieved 15 June 2018.
- Ferguson MA, Davis AC, Lovell EA (1 July 2000). "Cinemas - do they pose a risk to hearing?". Noise & Health. 2 (8): 55–58. PMID 12689462.
- Niemeyer W (1971). "Relations between the discomfort level and the reflex threshold of the middle ear muscles". Audiology. 10 (3): 172–6. doi:10.3109/00206097109072555. PMID 5163659.
- Tak S, Davis RR, Calvert GM (May 2009). "Exposure to hazardous workplace noise and use of hearing protection devices among US workers--NHANES, 1999-2004". American Journal of Industrial Medicine. 52 (5): 358–71. doi:10.1002/ajim.20690. PMID 19267354.
- "Work-Related Hearing Loss". National Institute for Occupational Safety and Health. 2001.
- "The Construction Chart Book: The US Construction Industry and its Workers" (PDF). CPWR. Retrieved 12 June 2013.
- Ehlers J, Graydon PS (11 October 2012). "Even a Dummy Knows October is Protect Your Hearing Month". National Institute for Occupational Safety and Health (NIOSH). Retrieved 22 January 2015.
- Tikka, Christina; Verbeek, Jos H.; Kateman, Erik; Morata, Thais C.; Dreschler, Wouter A.; Ferrite, Silvia (2017). "Interventions to prevent occupational noise-induced hearing loss". The Cochrane Database of Systematic Reviews. 7: CD006396. doi:10.1002/14651858.CD006396.pub4. PMC 6353150. PMID 28685503.
- Jansson E, Karlsson K (1983). "Sound levels recorded within the symphony orchestra and risk criteria for hearing loss". Scandinavian Audiology. 12 (3): 215–21. doi:10.3109/01050398309076249. PMID 6648318.
- Maia JR, Russo IC (2008). "[Study of the hearing of rock and roll musicians]" [Study of the hearing of rock and roll musicians]. Pro-Fono (in Portuguese). 20 (1): 49–54. doi:10.1590/S0104-56872008000100009. PMID 18408864.
- "Rock and Roll Hard of Hearing Hall of Fame". Guitar Player. 2006. Archived from the original on 4 March 2009.
- Ostri B, Eller N, Dahlin E, Skylv G (1989). "Hearing impairment in orchestral musicians". Scandinavian Audiology. 18 (4): 243–9. doi:10.3109/14992028909042202. PMID 2609103.
- Morata TC (March 2007). "Young people: their noise and music exposures and the risk of hearing loss". International Journal of Audiology. 46 (3): 111–2. doi:10.1080/14992020601103079. PMID 17365063.
- Fligor BJ (2009). "Risk for Noise-Induced Hearing Loss from Use of Portable Media Players: A Summary of Evidence Through 2008". Perspectives on Audiology. 5: 10. doi:10.1044/poa5.1.10.
- Williams W (April 2005). "Noise exposure levels from personal stereo use". International Journal of Audiology. 44 (4): 231–6. doi:10.1080/14992020500057673. PMID 16011051.
- Kardous C, Themann C, Morata T, Reynolds J, Afanuh S (June 2015). "Reducing the risk of hearing disorders among musicians" (PDF). Publication No. 2015–184. Cincinnati, OH: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health. DHHS (NIOSH).
- "Hearing Protection for Musicians - Hearing Review". Hearing Review. Retrieved 30 November 2018.
- Santucci M. "Protecting Musicians from Hearing Damage: A Review of Evidence-based Research - ProQuest". search.proquest.com. Retrieved 30 November 2018.
- Coleman C (28 March 2018). "Musician wins ruling over hearing damage". BBC News. Retrieved 30 March 2018.
- Gelfand S (2001). Auditory System and Related Disorders. Essentials of Audiology (2nd ed.). New York: Thieme. p. 202.
- "Occupational Noise Exposure". Centers for Disease Control and Prevention. June 1998. doi:10.26616/NIOSHPUB98126.
- Fausti SA, Wilmington DJ, Helt PV, Helt WJ, Konrad-Martin D (2005). "Hearing health and care: the need for improved hearing loss prevention and hearing conservation practices". Journal of Rehabilitation Research and Development. 42 (4 Suppl 2): 45–62. doi:10.1682/JRRD.2005.02.0039. PMID 16470464.
- "Hearing Conservation". Occupational Safety & Health Administration. 2002.
- Directive 2003/10/EC of the European Parliament and of the Council of 6 February 2003 on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (noise)
- Ammon R, Mahoney K, Fried G, Al Arkoubi Ka, Finn D (1 February 2015). "Roar of the Crowd: Noise-Related Safety Concerns in Sport". Journal of Legal Aspects of Sport. 25 (1): 10–26. doi:10.1123/jlas.2013-0020.
- "Noise Exposure in Sports: Studying How Noise Affects Fans, Players, and Personnel in Stadium Settings – soundscapes". sites.duke.edu. Retrieved 16 October 2017.
- "Loudest crowd roar at a sports stadium". Guinness World Records. Retrieved 16 October 2017.
- Hickey J. "Power Ranking the NFL's 10 Loudest Stadiums". Bleacher Report. Retrieved 16 October 2017.
- Engard DJ, Sandfort DR, Gotshall RW, Brazile WJ (November 2010). "Noise exposure, characterization, and comparison of three football stadiums". Journal of Occupational and Environmental Hygiene. 7 (11): 616–21. doi:10.1080/15459624.2010.510107. hdl:10217/21586. PMID 20835945.
- NIOSH (1998). "U.S. Hot Rod Monster Truck and Motocross Show" (PDF). Retrieved 9 July 2018.
- NIOSH (2000). "Human Performance International, Inc" (PDF). Retrieved 9 July 2018.
- Kardous CA, Morata TC (2010). "Occupational and recreational noise exposures at stock car racing circuits: An exploratory survey of three professional race tracks". Noise Control Engineering Journal. 58 (1): 54. doi:10.3397/1.3270506. ISSN 0736-2501.
- Kardous CA, Morata T (16 August 2010). "High Speeds, Higher Decibels". NIOSH Science Blog. Centers for Disease Control and Prevention. Retrieved 9 July 2018.
- Bernstein V (26 August 2007). "The Sound and the Fury, and Possibly the Danger". The New York Times. Retrieved 9 July 2018.
- Ganguli T (15 February 2009). "Hearing loss an inevitable part of racecar driving". Orlando Sentinel. Retrieved 9 July 2018.
- McGee R (28 February 2017). "Just listen: Quieting the cars just a tad won't hurt NASCAR". ESPN. Retrieved 9 July 2018.
- Swanepoel DW (10 February 2010). "Vuvuzela - good for your team, bad for your ears". South African Medical Journal. 100 (2).
- Kardous CA, Morata T (17 June 2010). "Vuvuzelas: What's the Buzz?". NIOSH Science Blog. Centers for Disease Control and Prevention. Retrieved 9 July 2018.
- Cranston CJ, Brazile WJ, Sandfort DR, Gotshall RW (9 October 2012). "Occupational and recreational noise exposure from indoor arena hockey games". Journal of Occupational and Environmental Hygiene. 10 (1): 11–6. doi:10.1080/15459624.2012.736341. PMID 23145529.
- Adams KL, Brazile WJ (February 2017). "A faceoff with hazardous noise: Noise exposure and hearing threshold shifts of indoor hockey officials". Journal of Occupational and Environmental Hygiene. 14 (2): 104–112. doi:10.1080/15459624.2016.1225158. PMID 27540829.
- England B (27 June 2013). "Noise Levels Among Spectators at an Intercollegiate Sporting Event". American Journal of Audiology. 23 (1): 71–78. doi:10.1044/1059-0889(2013/12-0071). PMID 24096863.
- "How Do We Hear?". NIDCD. 18 August 2015. Retrieved 13 February 2018.
- Liberman, Charles; Kujawa, Sharon G. (2017). "Cochlear synaptopathy in acquired sensorineural hearing loss: Manifestations and mechanisms". Hearing Research. 349: 138–147. doi:10.1016/j.heares.2017.01.003. PMC 5438769. PMID 28087419.
- Dancer A (1991). "Le traumatisme acoustique" (PDF). Médecine/Sciences (in French). 7 (4): 357–367. doi:10.4267/10608/4361.
- Misrahy GA, Arnold JE, Mundie JR, Shinabarger EW, Garwood VP (1958). "Genesis of Endolymphatic Hypoxia Following Acoustic Trauma". The Journal of the Acoustical Society of America. 30 (12): 1082–1088. Bibcode:1958ASAJ...30.1082M. doi:10.1121/1.1909465.
- Pujol R. "Acoustic trauma". Journey into the world of hearing. Retrieved 12 July 2015.
- Yamasoba T, Nuttall AL, Harris C, Raphael Y, Miller JM (February 1998). "Role of glutathione in protection against noise-induced hearing loss". Brain Research. 784 (1–2): 82–90. doi:10.1016/S0006-8993(97)01156-6. PMID 9518561.
- Raphael Y (2002). "Cochlear pathology, sensory cell death and regeneration". British Medical Bulletin. 63 (1): 25–38. doi:10.1093/bmb/63.1.25. PMID 12324382.
- Pujol R, Puel JL (November 1999). "Excitotoxicity, synaptic repair, and functional recovery in the mammalian cochlea: a review of recent findings". Annals of the New York Academy of Sciences. 884 (1): 249–54. Bibcode:1999NYASA.884..249P. doi:10.1111/j.1749-6632.1999.tb08646.x. PMID 10842598.
- Shi L, Chang Y, Li X, Aiken S, Liu L, Wang J (2016). "Cochlear Synaptopathy and Noise-Induced Hidden Hearing Loss". Neural Plasticity. 2016: 6143164. doi:10.1155/2016/6143164. PMC 5050381. PMID 27738526.
- Brown AM, Hamann M (2014). "Computational modeling of the effects of auditory nerve dysmyelination". Frontiers in Neuroanatomy. 8 (73): 73. doi:10.3389/fnana.2014.00073. PMC 4117982. PMID 25136296.
- Wheeler DE (March 1950). "Noise-induced hearing loss". Archives of Otolaryngology. 51 (3): 344–55. doi:10.1001/archotol.1950.00700020366006.
- Hong O, Kerr MJ, Poling GL, Dhar S (April 2013). "Understanding and preventing noise-induced hearing loss". Disease-A-Month. 59 (4): 110–8. doi:10.1016/j.disamonth.2013.01.002. PMID 23507351.
- Johnson AC, Morata TC (2010). Occupational exposure to chemicals and hearing impairment. The Nordic Expert Group for Criteria Documentation of Health Risks from Chemicals (PDF). Arbete och Hälsa. 44. Gothenburg, Sweden: University of Gothenburg. pp. 1–177. ISBN 978-91-85971-21-3.
- Rösler G (1994). "Progression of hearing loss caused by occupational noise". Scandinavian Audiology. 23 (1): 13–37. doi:10.3109/01050399409047483. PMID 8184280.
- Chen JD, Tsai JY (January 2003). "Hearing loss among workers at an oil refinery in Taiwan". Archives of Environmental Health. 58 (1): 55–8. doi:10.3200/AEOH.58.1.55-58. PMID 12747520.
- Johnson M, Martin WH. "Dangerous Decibels Educator Resource Guide". Dangerous Decibels. Oregon Health and Science University.
- "Noisy Planet". www.noisyplanet.nidcd.nih.gov. Retrieved 22 February 2019.
- "1.1 billion people at risk of hearing loss: WHO highlights serios threat posed by exposure to recreational noise". World Health Organization.
- Rajgurur R (2013). "Military aircrew and noise-induced hearing loss: prevention and management". Aviation, Space, and Environmental Medicine. 84 (12): 1268–1276. doi:10.3357/ASEM.3503.2013.
- Sekhar DL, Clark SJ, Davis MM, Singer DC, Paul IM (January 2014). "Parental perspectives on adolescent hearing loss risk and prevention". JAMA Otolaryngology–Head & Neck Surgery. 140 (1): 22–8. doi:10.1001/jamaoto.2013.5760. PMID 24263465.
- El Dib RP, Mathew JL, Martins RH (April 2012). "Interventions to promote the wearing of hearing protection". The Cochrane Database of Systematic Reviews. 4 (4): CD005234. doi:10.1002/14651858.CD005234.pub5. PMID 22513929. (Retracted, see doi:10.1002/14651858.cd005234.pub6. If this is an intentional citation to a retracted paper, please replace
- "Hearing loss due to recreational exposure to loud sounds: a review" (PDF). World Health Organization. 2015.
- Cone BK, Wake M, Tobin S, Poulakis Z, Rickards FW (April 2010). "Slight-mild sensorineural hearing loss in children: audiometric, clinical, and risk factor profiles". Ear and Hearing. 31 (2): 202–12. doi:10.1097/AUD.0b013e3181c62263. PMID 20054279.
- Jiang W, Zhao F, Guderley N, Manchaiah V (2016). "Daily music exposure dose and hearing problems using personal listening devices in adolescents and young adults: A systematic review". International Journal of Audiology. 55 (4): 197–205. doi:10.3109/14992027.2015.1122237. hdl:10369/8234. PMID 26768911.
- Ivory R, Kane R, Diaz RC (October 2014). "Noise-induced hearing loss: a recreational noise perspective". Current Opinion in Otolaryngology & Head and Neck Surgery. 22 (5): 394–8. doi:10.1097/moo.0000000000000085. PMID 25101942.
- Keppler H, Ingeborg D, Sofie D, Bart V (2015). "The effects of a hearing education program on recreational noise exposure, attitudes and beliefs toward noise, hearing loss, and hearing protector devices in young adults". Noise & Health. 17 (78): 253–62. doi:10.4103/1463-1741.165028. PMC 4900500. PMID 26356367.
- Tikka C, Verbeek JH, Kateman E, Morata TC, Dreschler WA, Ferrite S (July 2017). "Interventions to prevent occupational noise-induced hearing loss". The Cochrane Database of Systematic Reviews. 7: CD006396. doi:10.1002/14651858.cd006396.pub4. PMC 6353150. PMID 28685503.
- "Mission". We're hEAR for you. 5 April 2011.
- "Buy Quiet". NIOSH. 5 December 2014. Retrieved 28 October 2015.
- "Excellence and Innovation in Hearing Loss Prevention Awards". Safe-in-Sound.
- Gordin A, Goldenberg D, Golz A, Netzer A, Joachims HZ (July 2002). "Magnesium: a new therapy for idiopathic sudden sensorineural hearing loss". Otology & Neurotology. 23 (4): 447–51. doi:10.1097/00129492-200207000-00009. PMID 12170143.
- Nelson TJ (4 December 2009). "Noise-induced hearing loss".[self-published source?]
- Scheibe F, Haupt H, Ising H, Cherny L (March 2002). "Therapeutic effect of parenteral magnesium on noise-induced hearing loss in the guinea pig". Magnesium Research. 15 (1–2): 27–36. PMID 12030420.
- "Magnesium". A.D.A.M., Inc. 17 June 2011.
- Canlon B, Fransson A (April 1995). "Morphological and functional preservation of the outer hair cells from noise trauma by sound conditioning". Hearing Research. 84 (1–2): 112–24. doi:10.1016/0378-5955(95)00020-5. PMID 7642444.
- Yoshida N, Kristiansen A, Liberman MC (November 1999). "Heat stress and protection from permanent acoustic injury in mice". The Journal of Neuroscience. 19 (22): 10116–24. doi:10.1523/JNEUROSCI.19-22-10116.1999. PMID 10559419.
- Wang Y, Liberman MC (March 2002). "Restraint stress and protection from acoustic injury in mice". Hearing Research. 165 (1–2): 96–102. doi:10.1016/s0378-5955(02)00289-7. PMID 12031519.
- Yoshida N, Liberman MC (October 2000). "Sound conditioning reduces noise-induced permanent threshold shift in mice". Hearing Research. 148 (1–2): 213–9. doi:10.1016/s0378-5955(00)00161-1. PMID 10978838.
- Patuzzi RB, Thompson ML (July 1991). "Cochlear efferent neurones and protection against acoustic trauma: protection of outer hair cell receptor current and interanimal variability". Hearing Research. 54 (1): 45–58. doi:10.1016/0378-5955(91)90135-V. PMID 1917716.
- Tahera Y, Meltser I, Johansson P, Salman H, Canlon B (January 2007). "Sound conditioning protects hearing by activating the hypothalamic-pituitary-adrenal axis". Neurobiology of Disease. 25 (1): 189–97. doi:10.1016/j.nbd.2006.09.004. PMID 17056263.
- Casanovaa F, Saroulb H, Nottetc JB (2010). "Acute acoustic trauma: a study about treatment and prevention including 111 military doctors" (PDF). Pratique Médico-militaire.
- Savastano S, Tommaselli AP, Valentino R, Scarpitta MT, D'Amore G, Luciano A, Covelli V, Lombardi G (August 1994). "Hypothalamic-pituitary-adrenal axis and immune system". Acta Neurologica. 16 (4): 206–13. PMID 7856475.
- Suckfuell M, Canis M, Strieth S, Scherer H, Haisch A (September 2007). "Intratympanic treatment of acute acoustic trauma with a cell-permeable JNK ligand: a prospective randomized phase I/II study". Acta Oto-Laryngologica. 127 (9): 938–42. doi:10.1080/00016480601110212. PMID 17712672.
- Psillas G, Pavlidis P, Karvelis I, Kekes G, Vital V, Constantinidis J (December 2008). "Potential efficacy of early treatment of acute acoustic trauma with steroids and piracetam after gunshot noise". European Archives of Oto-Rhino-Laryngology. 265 (12): 1465–9. doi:10.1007/s00405-008-0689-6. PMID 18463885.
- Prasher D (October 1998). "New strategies for prevention and treatment of noise-induced hearing loss". Lancet. 352 (9136): 1240–2. doi:10.1016/S0140-6736(05)70483-9. PMID 9788450.
- Lynch ED, Kil J (October 2005). "Compounds for the prevention and treatment of noise-induced hearing loss". Drug Discovery Today. 10 (19): 1291–8. doi:10.1016/s1359-6446(05)03561-0. PMID 16214673.
- Guiard J, Fiege B, Kitov PI, Peters T, Bundle DR (June 2011). ""Double-click" protocol for synthesis of heterobifunctional multivalent ligands: toward a focused library of specific norovirus inhibitors". Chemistry. 17 (27): 7438–41. doi:10.1002/chem.201003414. PMID 21469230.
- Bayoumy AB, van der Veen EL, van Ooij PA, Besseling-Hansen FS, Koch DA, Stegeman I, de Ru JA (January 2019). "Effect of hyperbaric oxygen therapy and corticosteroid therapy in military personnel with acute acoustic trauma". Journal of the Royal Army Medical Corps: jramc–2018–001117. doi:10.1136/jramc-2018-001117. PMID 30612101.
- Oishi N, Schacht J (June 2011). "Emerging treatments for noise-induced hearing loss". Expert Opinion on Emerging Drugs. 16 (2): 235–45. doi:10.1517/14728214.2011.552427. PMC 3102156. PMID 21247358.
- "Noise-Induced Hearing Loss". National Institute on Deafness and Other Communication Disorders. October 2008.
- Raphael Y (2002). "Cochlear pathology, sensory cell death and regeneration". British Medical Bulletin. 63: 25–38. doi:10.1093/bmb/63.1.25. PMID 12324382.
- Sun H, Huang A, Cao S (November 2011). "Current status and prospects of gene therapy for the inner ear". Human Gene Therapy. 22 (11): 1311–22. doi:10.1089/hum.2010.246. PMC 3225036. PMID 21338273.
- Kawamoto K, Ishimoto S, Minoda R, Brough DE, Raphael Y (June 2003). "Math1 gene transfer generates new cochlear hair cells in mature guinea pigs in vivo". The Journal of Neuroscience. 23 (11): 4395–400. doi:10.1523/JNEUROSCI.23-11-04395.2003. PMID 12805278.
- "Treatment | Hearing Loss | NCBDDD | CDC". www.cdc.gov. 18 February 2015. Retrieved 13 February 2018.
- "FM Systems". www.asha.org. Retrieved 15 October 2017.
- McNeill, Celene; Távora-Vieira, Dayse; Alnafjan, Fadwa; Searchfield, Grant D.; Welch, David (1 December 2012). "Tinnitus pitch, masking, and the effectiveness of hearing aids for tinnitus therapy". International Journal of Audiology. 51 (12): 914–919. doi:10.3109/14992027.2012.721934. ISSN 1499-2027. PMID 23126317.
- Eggermont, J. (2005). Tinnitus: neurobiological substrates. Drug Discovery Today. 10 (19): 1283-1290. 
- Dobie, Robert A. (1999). "A Review of Randomized Clinical Trials in Tinnitus". The Laryngoscope (in French). 109 (8): 1202–1211. doi:10.1097/00005537-199908000-00004. ISSN 1531-4995. PMID 10443820.
- Andersson, G.; Lyttkens, L. (1 January 1999). "A meta-analytic review of psychological treatments for tinnitus". British Journal of Audiology. 33 (4): 201–210. doi:10.3109/03005369909090101. ISSN 0300-5364. PMID 10509855.
- Chisolm TH, Johnson CE, Danhauer JL, Portz LJ, Abrams HB, Lesner S, McCarthy PA, Newman CW (February 2007). "A systematic review of health-related quality of life and hearing aids: final report of the American Academy of Audiology Task Force On the Health-Related Quality of Life Benefits of Amplification in Adults". Journal of the American Academy of Audiology. 18 (2): 151–83. doi:10.3766/jaaa.18.2.7. PMID 17402301.
- "1.1 billion people at risk of hearing loss: WHO highlights serios threat posed by exposure to recreational noise". World Health Organization.
- Basner M, Babisch W, Davis A, Brink M, Clark C, Janssen S, Stansfeld S (April 2014). "Auditory and non-auditory effects of noise on health". Lancet. 383 (9925): 1325–32. doi:10.1016/s0140-6736(13)61613-x. PMC 3988259. PMID 24183105.
- Carroll YI, Eichwald J, Scinicariello F, Hoffman HJ, Deitchman S, Radke MS, Themann CL, Breysse P (February 2017). "Vital Signs: Noise-Induced Hearing Loss Among Adults - United States 2011-2012". MMWR. Morbidity and Mortality Weekly Report. 66 (5): 139–144. doi:10.15585/mmwr.mm6605e3. PMC 5657963. PMID 28182600.
- Chen, Yali; Zhang, Meibian; Qiu, Wei; Sun, Xin; Wang, Xin; Dong, Yiwen; Chen, Zhenlong; Hu, Weijiang (10 June 2019). "Prevalence and determinants of noise‐induced hearing loss among workers in the automotive industry in China: A pilot study". Journal of Occupational Health. doi:10.1002/1348-9585.12066. ISSN 1341-9145. PMID 31183937.
- Masterson EA, Tak S, Themann CL, Wall DK, Groenewold MR, Deddens JA, Calvert GM (June 2013). "Prevalence of hearing loss in the United States by industry". American Journal of Industrial Medicine. 56 (6): 670–81. doi:10.1002/ajim.22082. PMID 22767358.
- Masterson EA, Themann CL, Calvert GM (January 2018). "Prevalence of hearing loss among noise-exposed workers within the agriculture, forestry, fishing, and hunting sector, 2003-2012". American Journal of Industrial Medicine. 61 (1): 42–50. doi:10.1002/ajim.22792. PMC 5905332. PMID 29152771.
- Masterson EA, Themann CL, Calvert GM (April 2018). "Prevalence of Hearing Loss Among Noise-Exposed Workers Within the Health Care and Social Assistance Sector, 2003 to 2012". Journal of Occupational and Environmental Medicine. 60 (4): 350–356. doi:10.1097/JOM.0000000000001214. PMID 29111986.
- Noise-Induced Hearing Loss from the National Institutes of Health
- How to Prevent Noise-Induced Hearing Loss from the American Academy of Family Physicians.
- Dangerous Decibels Includes general information and a "virtual exhibit" as well as resources for teachers.
- NIOSH Noise and Hearing Loss Prevention Topic Page
- NIOSH Power Tools Sound Pressure and Vibrations Database
- New York City construction noise control products and vendor guidance sheet
- Online Audiometric Test Calibrated test, up to 80 dBHL. Confirm your hearing loss and track how it evolves over time.
- An online audiometric test featuring equal loudness curves
- NIOSH Buy Quiet Topic Page
- www.cochlea.org/en/noise - animation of damage of hairs, harmful intensities graph
- www.cochlea.eu/en/hair-cells - illustrations and images of hair cells