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J Appl Physiol 91: 1259-1268, 2001;
8750-7587/01 $5.00
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Vol. 91, Issue 3, 1259-1268, September 2001

Effect of race and resistance training status on the density of fat-free mass and percent fat estimates

Melinda L. Millard-Stafford1, Mitchell A. Collins2, Christopher M. Modlesky3, Teresa K. Snow1, and Linda B. Rosskopf1

1 Exercise Physiology Laboratory, Department of Health and Performance Sciences, Georgia Institute of Technology, Atlanta 30332-0356; 2 Department of Health, Physical Education, and Sport Science, Kennesaw State University, Kennesaw 30144-5591; and 3 Department of Exercise Science and Department of Foods and Nutrition, University of Georgia, Athens, Georgia 30602

The impact of race and resistance training status on the assumed density of the fat-free mass (DFFM) and estimates of body fatness via hydrodensitometry (%FatD) vs. a four-component model (density, water, mineral; %FatD,W,M) were determined in 45 men: white controls (W; n = 15), black controls (B; n = 15), and resistance-trained blacks (B-RT; n = 15). Body density by hydrostatic weighing, body water by deuterium dilution, and bone mineral by dual-energy X-ray absorptiometry were used to estimate %FatD,W,M. DFFM was not different between B and W (or 1.1 g/ml); however, DFFM in B-RT was significantly lower (1.091 ± 0.012 g/ml; P < 0.05). Therefore, %FatD using the Siri equation was not different from %FatD,W,M in W (17.5 ± 5.0 vs. 18.3 ± 5.4%) or B (14.9 ± 5.6 vs. 15.7 ± 5.7%) but significantly overestimated %FatD,W,M in B-RT (14.0 ± 5.9 vs. 10.4 ± 6.0%; P < 0.05). The use of a race-specific equation (assuming DFFM = 1.113 g/ml) did not improve the agreement between %FatD and %FatD,W,M, resulting in a significantly greater mean (±SD) discrepancy for B (1.7 ± 1.8% fat) and B-RT (6.2 ± 4.3% fat). Thus race per se does not affect DFFM or estimates of %FatD; however, B-RT have a DFFM lower than 1.1 g/ml, leading to an overestimation of %FatD.

body water; hydrodensitometry; bone mineral; body composition; Schutte equation; blacks


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