Corpulence index
The Corpulence Index (CI) or Ponderal Index (PI) is a measure of leanness (corpulence) of a person[1] calculated as a relationship between mass and height.[2] It was first proposed in 1921 as the "Corpulence measure" by Swiss physician Fritz Rohrer[3] and hence is also known as Rohrer's Index.[4] It is similar to the body mass index, but the mass is normalized with the third power of body height rather than the second power.[5]
with in kilograms and in metres, giving a measure with the same dimensions as density. The corpulence index yields valid results even for very short and very tall persons.[6] Because of this property, it is most commonly used in pediatrics.[7][8] (For a baby, one can take crown-heel length for the height.[9]) The normal values for infants are about twice as high as for adults, which is the result of their relatively short legs.[citation needed] It does not need to be adjusted for age after adolescence.[5] It has also been shown to have a lower false positive rate in athletes.[10]
The corpulence index is variously defined (the first definition should be preferred due to the use of SI-units kg and m) as follows:
| Formula | Units for mass (body weight) |
Units for height (or length) |
Values considered normal or typical | |
|---|---|---|---|---|
| for a 12-month-old infant | beyond infancy | |||
| [8] | kilograms | metres | 24[7] | 12[5] |
| [7] | grams | centimetres | (same values as above) | |
| [1][11] | pounds | inches | 12.49 to 13.92 | |
![{\displaystyle {\text{CI}}={\frac {\mathrm {height} }{\sqrt[{3}]{\mathrm {mass} }}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/0d2cb85fbc92055fed3fe948542f1a38d28888b9)
Significance
- It plays a role in assessing whether the intrauterine growth restriction of a child is symmetrical or asymmetrical.[12]
- CI has been shown to have higher sensitivity, specificity, as well as both positive and negative predictive values than body mass index.[5]
See also
References
- ^ a b Foods and Nutrition Encyclopedia, Audrey H. Ensminger, Marion Eugene Ensminger. p. 1645
- ^ EXSS 323: LAB 1 - BIOMECHANICS TOOLS: Computers, Algebra and Trig Oregon State University
- ^ F. Rohrer (1921). "Der Index der Körperfülle als Maß des Ernährungszustandes". Münchner Med. WSCHR. 68: 580–582.
- ^ http://www.wisegeek.com/what-is-the-ponderal-index.htm
- ^ a b c d Babar, Sultan (March 2015). "Evaluating the Performance of 4 Indices in Determining Adiposity". Clinical Journal of Sport Medicine. 25 (2). Lippincott Williams & Wilkins): 183. Retrieved August 2015.
{{cite journal}}: Check date values in:|access-date=(help) - ^ Lawrence F. Ditmier: New Developments in Obesity Research. Nova Science Publishers, Hauppauge, New York 2006, ISBN 1-60021-296-4[page needed]
- ^ a b c Davies, D. P. (1980). "Size at birth and growth in the first year of life of babies who are overweight and underweight at birth". Proceedings of the Nutrition Society. 39 (1): 25–33. doi:10.1079/PNS19800005. PMID 6988835.
- ^ a b ACC/SCN NUTRITION POLICY PAPER No. 19 - Glossary Archived 2007-08-20 at the Wayback Machine by Lindsay H. Allen and Stuart R. Gillespie
- ^ Fayyaz, Jabeen (June 2005). "Ponderal Index". Journal of Pakistan Medical Association.
- ^ Babar, Sultan (March 2016). "The Use of Adiposity Indices for Wide Receivers From 2015 NFL Combine". Clinical Journal of Sport Medicine. 26 (2). Lippincott Williams & Wilkins) 2: e23. Retrieved April 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ https://captaincalculator.com/health/weight/ponderal-index-calculator/
- ^ Khoury, MJ; Berg, CJ; Calle, EE (September 1990). "The ponderal index in term newborn siblings". American Journal of Epidemiology. 132 (3): 576–83. doi:10.1093/oxfordjournals.aje.a115694. PMID 2389761.
External links
- Online Ponderal Index Calculator, which uses the first definition.
- Ponderal Index Calculator, which uses metric values. (German site)
- Android App for Corpulence Index
- Apple app for Corpulence Index