Yoga for therapeutic purposes
Yoga for therapeutic purposes is the use of modern yoga as a gentle form of exercise and relaxation to maintain or improve health. Yoga in this sense often occurs in a class and may involve meditation, imagery, breath work and music.
Background and overview
Modern yoga exercise classes used as therapy usually consist of asanas (postures used for stretching exercises), pranayama (breathing exercises), and relaxation in savasana (lying down). The physical asanas of modern yoga belong to a hatha yoga tradition that goes back to at least the 11th century, but they were not widely practiced in India prior to the early 20th century.
The more classical approaches of modern yoga such as iyengar yoga, move at a more deliberate pace, emphasize proper alignment and execution and hold asanas for a longer time. They aim to gradually improve flexibility, balance, and strength. Other approaches, such as Ashtanga or power yoga, shift between asanas quickly and energetically. Contemporary approaches to yoga invite students to become their own authority in yoga practice by offering principle-based approaches to yoga that can be applied to any form.
Much of the research on the therapeutic use of modern yoga has been in the form of preliminary studies or clinical trials of low methodological quality, including small sample sizes, inadequate blinding, lack of randomization, and high risk of bias. Modern yoga does not have specific standardization of its practice.
A 2010 literature review stated, "although the results from these trials are encouraging, they should be viewed as very preliminary because the trials, as a group, suffered from substantial methodological limitations." A 2015 systematic review on the effect of yoga on mood and the brain concluded that "yoga is associated with better regulation of the sympathetic nervous system and hypothalamic-pituitary-adrenal system, as well as a decrease in depressive and anxious symptoms in a range of populations." The same review recommended more methodological rigor be applied to future clinical trials.
One review found little evidence that yoga helps people with dementia perform their daily activities, while another showed there were no effects on attention deficit hyperactivity disorder. There was weak evidence supporting yoga as an alternative treatment for insomnia, with no evidence that yoga was better than general relaxation.
Only weak evidence was found to support the use of hatha yoga as a complementary therapy for rheumatic diseases, with no evidence of its safety. Although one study found a small effect of yoga to lower high blood pressure, overall this evidence was too weak for any recommendation to be made, and provided no information about safety. There was no evidence of benefit in treatment of epilepsy or menopause-related symptoms. Practice of yoga had no effect on the underlying mechanisms of cancer.
Although relatively safe, yoga is not risk free. Sensible precautions can usefully be taken – for example beginners should avoid advanced moves, yoga should not be combined with psychoactive drug use, and competitive yoga should be avoided.
A small percentage of yoga practitioners each year suffer physical injuries analogous to sports injuries. The practice of yoga has been cited as a cause of hyperextension or rotation of the neck, which may be a precipitating factor in cervical artery dissection.
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