Cross-validation of modified fatness-specific bioelectrical impedance equations.
The Segal fatness-specific bioelectrical impedance (BIA) equations are useful for predicting fat-free mass (FFM). Stolarczyk et al. Proposed a modified method of averaging the two equations for individuals who are neither lean nor obese, thus eliminating the need to know % BF a priori. To cross-validate this modification, we compared FFM determined using the averaging method versus hydrostatic weighing for 76 adults. Per the averaging method, accuracy for males was excellent (r =.91, SEE = 2.7 kg, E = 2.7 kg), with 78% of individuals within +/- .5% BF predicted by hydrostatic weighing. Accuracy for females was lower (r =.88, SEE = 3.0 kg, E = 3.1 kg), with % BF of 51% within +/- 3.5% of the reference method. The relative ease and practicality of the averaging method and the results of this study indicate this method may be useful with a diverse group.
Center for Exercise and Applied Human Physiology, University of New Mexico, Albuquerque, NM, 87131, USA.
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Lockner
V H
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Heyward
S E
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Griffin
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MB
Marques
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LM
Stolarczyk
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Wagner
D000273:Adipose Tissue / Q000033:anatomy & histology*; D000328:Adult; D000368:Aged; D001823:Body Composition; D001827:Body Height; D015992:Body Mass Index; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000033:anatomy & histology; D009765:Obesity / Q000473:pathology; D012044:Regression Analysis; D015203:Reproducibility of Results; D012737:Sex Factors; D012885:Skinfold Thickness; D014867:Water
D014867:Water