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{{technical|date=December 2012}} | |||
The '''Body Adiposity Index''' ('''BAI''') is a method of measuring human [[body fat]]. The BAI is calculated without using body weight, unlike the [[body mass index]] (BMI) usually used as an indicator for body fat. Based on population studies, the BAI is approximately equal to the percentage of body fat for adult men and women of differing ethnicities.<ref>{{cite web|url=http://www.nature.com/oby/journal/vaop/ncurrent/abs/oby201138a.html|title=A Better Index of Body Adiposity|publisher=Obesity - A Research Journal|accessdate=7 March 2011}}</ref> | |||
The BAI is calculated as:<ref>[http://www.myhealthnewsdaily.com/body-fat-index-obesity-calculator-110303-1230/ New Method of Calculating Body Fat Unlikely to Replace BMI]</ref> | |||
<math> | |||
\frac{100 \times \text{hip circumference in m}}{\text{height in m} \times \sqrt{\text{height}}} - 18 | |||
</math> | |||
Hip circumference (R = 0.602) and height (R = −0.524) are strongly [[Pearson product-moment correlation coefficient|correlated]] with percentage of body fat. Comparing BAI with "[[gold standard (test)|gold standard]]" [[dual-energy X-ray absorptiometry]] (DXA) results, the correlation between DXA-derived percentage of adiposity and the BAI in a target population was R = 0.85, with a [[Concordance correlation coefficient|concordance]] of C_b = 0.95.<ref>[http://www.emaxhealth.com/1024/new-bai-better-old-bmi Is the new BAI better than the old BMI?]</ref> | |||
The BAI could be a good tool to measure adiposity due, at least in part, to the advantages over other more complex mechanical or electrical systems. Probably, the most important advantage of BAI over BMI is that weight is not needed. However, in general it seems that the BAI does not overcome the limitations of BMI.<ref>[http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0035281 López AA, Cespedes ML, Vicente T, Tomas M, Bennasar-Veny M, et al. (2012) Body Adiposity Index Utilization in a Spanish Mediterranean Population: Comparison with the Body Mass Index. PLoS ONE 7(4): e35281]</ref> | |||
Stated advantages of the BAI are that it approximates body fat percentage, while the widely used BMI is known to be of limited accuracy, and is different for males and females with similar percentage body adiposity; and that it does not involve weighing, so can be used in remote locations with limited access to scales. A detailed study published in 2012 concluded that estimates of body fat percentage based on BAI were not more accurate than those based on BMI, waist circumference, or hip circumference.<ref>[http://www.ncbi.nlm.nih.gov/pubmed/22484365 ''The body adiposity index (hip circumference ÷ height(1.5)) is not a more accurate measure of adiposity than is BMI, waist circumference, or hip circumference'', Freedman DS, Thornton J, Pi-Sunyer FX, Heymsfield SB, Wang J, Pierson Jr RN, Blanck HM, Gallagher D, Obesity (Silver Spring). 2012 Apr 9. doi: 10.1038/oby.2012.81]</ref> | |||
The adiposity indexes that include the waist circumference (WHtR and WC) may be better candidates than BAI and BMI to evaluate metabolic and cardiovascular risk in both clinical practice and research,<ref>[http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0063999 Bennasar-Veny M, Lopez-Gonzalez AA, Tauler P, Cespedes ML, Vicente-Herrero T, et al. (2013) Body Adiposity Index and Cardiovascular Health Risk Factors in Caucasians: A Comparison with the Body Mass Index and Others. PLoS ONE 8(5): e63999]</ref> | |||
== References == | |||
{{Reflist}} | |||
== External links == | |||
*[http://www.shapesense.com/fitness-exercise/calculators/body-adiposity-index-calculator.aspx Online BAI calculator]. One of many. Also classification, from underweight to obese, for men and women of different ages. | |||
*[http://www.theheart.org/article/1193643.do New obesity index proposed, but further work needed (theheart.org)] | |||
*[http://www.ottawacitizen.com/health/Better+than+obesity+scale+proposed/4378908/story.html Better than a BMI? New obesity scale proposed (Ottawa Citizen, originally Reuters)] | |||
*[http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0035281 Body Adiposity Index Utilization in a Spanish Mediterranean Population: Comparison with the Body Mass Index]. | |||
[[Category:Obesity]] |
Latest revision as of 15:27, 22 January 2013
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The Body Adiposity Index (BAI) is a method of measuring human body fat. The BAI is calculated without using body weight, unlike the body mass index (BMI) usually used as an indicator for body fat. Based on population studies, the BAI is approximately equal to the percentage of body fat for adult men and women of differing ethnicities.[1]
The BAI is calculated as:[2]
Hip circumference (R = 0.602) and height (R = −0.524) are strongly correlated with percentage of body fat. Comparing BAI with "gold standard" dual-energy X-ray absorptiometry (DXA) results, the correlation between DXA-derived percentage of adiposity and the BAI in a target population was R = 0.85, with a concordance of C_b = 0.95.[3]
The BAI could be a good tool to measure adiposity due, at least in part, to the advantages over other more complex mechanical or electrical systems. Probably, the most important advantage of BAI over BMI is that weight is not needed. However, in general it seems that the BAI does not overcome the limitations of BMI.[4]
Stated advantages of the BAI are that it approximates body fat percentage, while the widely used BMI is known to be of limited accuracy, and is different for males and females with similar percentage body adiposity; and that it does not involve weighing, so can be used in remote locations with limited access to scales. A detailed study published in 2012 concluded that estimates of body fat percentage based on BAI were not more accurate than those based on BMI, waist circumference, or hip circumference.[5]
The adiposity indexes that include the waist circumference (WHtR and WC) may be better candidates than BAI and BMI to evaluate metabolic and cardiovascular risk in both clinical practice and research,[6]
References
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External links
- Online BAI calculator. One of many. Also classification, from underweight to obese, for men and women of different ages.
- New obesity index proposed, but further work needed (theheart.org)
- Better than a BMI? New obesity scale proposed (Ottawa Citizen, originally Reuters)
- Body Adiposity Index Utilization in a Spanish Mediterranean Population: Comparison with the Body Mass Index.
- ↑ Template:Cite web
- ↑ New Method of Calculating Body Fat Unlikely to Replace BMI
- ↑ Is the new BAI better than the old BMI?
- ↑ López AA, Cespedes ML, Vicente T, Tomas M, Bennasar-Veny M, et al. (2012) Body Adiposity Index Utilization in a Spanish Mediterranean Population: Comparison with the Body Mass Index. PLoS ONE 7(4): e35281
- ↑ The body adiposity index (hip circumference ÷ height(1.5)) is not a more accurate measure of adiposity than is BMI, waist circumference, or hip circumference, Freedman DS, Thornton J, Pi-Sunyer FX, Heymsfield SB, Wang J, Pierson Jr RN, Blanck HM, Gallagher D, Obesity (Silver Spring). 2012 Apr 9. doi: 10.1038/oby.2012.81
- ↑ Bennasar-Veny M, Lopez-Gonzalez AA, Tauler P, Cespedes ML, Vicente-Herrero T, et al. (2013) Body Adiposity Index and Cardiovascular Health Risk Factors in Caucasians: A Comparison with the Body Mass Index and Others. PLoS ONE 8(5): e63999