Journal of Applied Physiology AJP: Lung Cellular and Molecular Physiology
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J Appl Physiol 87: 1114-1122, 1999;
8750-7587/99 $5.00
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Vol. 87, Issue 3, 1114-1122, September 1999

Reliability and validity of body composition measures in female athletes

Willa C. Fornetti1, James M. Pivarnik1,2, Jeanne M. Foley1, and Justus J. Fiechtner

Departments of 1 Kinesiology and 2 Osteopathic Surgical Specialties, Michigan State University, East Lansing, Michigan 48824

The purpose of this investigation was to determine the reliability and validity of bioelectrical impedance (BIA) and near-infrared interactance (NIR) for estimating body composition in female athletes. Dual-energy X-ray absorptiometry was used as the criterion measure for fat-free mass (FFM). Studies were performed in 132 athletes [age = 20.4 ± 1.5 (SD) yr]. Intraclass reliabilities (repeat and single trial) were 0.987-0.997 for BIA (resistance and reactance) and 0.957-0.980 for NIR (optical densities). Validity of BIA and NIR was assessed by double cross-validation. Because correlations were high (r = 0.969-0.983) and prediction errors low, a single equation was developed by using all 132 subjects for both BIA and NIR. Also, an equation was developed for all subjects by using height and weight only. Results from dual-energy X-ray absorptiometry analysis showed FFM = 49.5 ± 6.0 kg, which corresponded to %body fat (%BF) of 20.4 ± 3.1%. BIA predicted FFM at 49.4 ± 5.9 kg (r = 0.981, SEE = 1.1), and NIR prediction was 49.5 ± 5.8 kg (r = 0.975, SEE = 1.2). Height and weight alone predicted FFM at 49.4 ± 5.7 kg (r = 0.961, SEE = 1.6). When converted to %BF, prediction errors were ~1.8% for BIA and NIR and 2.9% for height and weight. Results showed BIA and NIR to be extremely reliable and valid techniques for estimating body composition in college-age female athletes.

body fat; dual-energy X-ray absorptiometry; sports; women


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