Bray et al used bioelectrical impedance analysis (BIA) to estimate fat-free mass (FFM) in young Americans. The authors are from the Pennington Biomedical Research Center in Baton Rouge, Louisianna.
Patient selection: 10 and 12 year old African American and White children
(1) height in centimeters
(2) resistance in Ohms
(3) weight in kilograms
resistance index = RI =
= ((height in cm)^2) / (resistance)
fat-free mass =
= ((0.4 * (resistance index)) + (0.148 * (weight)) + 3.32) / 0.76
percent body fat =
= ((body mass) – (fat free mass)) / (body mass) * 100%
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