De Rui et al reported equations for estimating lean mass of the extremities using results of bioelectrical impedance analysis (BIA). The authors are from the University of Padova in Italy.
Patient selection: Caucasian adult > 60 years of age
Analysis: BIA at 50kHaz
Parameters:
(1) sex (1 if male, 0 if female)
(2) body weight in kilograms
(3) height in centimeters
(4) resistance in Ohms
(5) reactance in Ohms
resistive index (RI) =
= ((height)^2) / (resistance)
lean mass for dominant leg in kilograms =
= (0.027 * (RI)) + (0.047 * (weight)) + (0.639 * (points for sex)) + (0.026 * (reactance)) - 0.462
lean mass for nondominant leg in kilograms =
= (0.029 * (RI)) + (0.045 * (weight)) + (0.569 * (points for sex)) + (0.025 * (reactance)) - 0.522
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