Abstract
This study examined the potential of single frequency (50 kHz) BIA for estimation of upper extremity skeletal muscle (SM) mass. Subjects ( n = 50) were weight stable adults varying in age ( X ± SD, 51.6 ± 17 yr) and body mass index (27.2 ± 5.9 kg/m 2). Determinants of arm to arm impedance index (length L; L 2/ Z) were examined using multiple regression analysis. A good correlation was observed between L 2/ Z and arm SM estimated by dual-energy X-ray absorptiometry ( r = 0.88, p < 0.001). Additional significant model covariates were arm fat mass ( p < 0.05), bone mass ( p < 0.01), and age ( p < 0.001). These findings suggest that upper extremity SM may be rapidly and easily quantified using a simple and inexpensive BIA system combined with appropriate age-adjusted impedance prediction equations.
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