Validity of two-component models for estimating body fat of black men.
Commonly used two-component model conversion formulas that estimate relative body fat (%BF) from body density (Db) were cross-validated on a heterogeneous sample of black men (n = 30; age = 19--45 yr). A four-component model was used to obtain criterion measures of %BF, and linear regression and analysis of individual residual scores were conducted to assess the predictive accuracy of the formulas under investigation. The two-component formula commonly used to estimate %BF of black men (Schutte JE, Townsend EJ, Hugg J, Shoup RF, Malina RM, and Blomqvist CG. J Appl Physiol 56: 1647-1649, 1984) significantly (P < or = 0.01) and systematically (87% of sample) overestimated %BF (-1.28%); thus we developed the following two-component Db conversion formula: %BF = [(4.858/Db) - 4.394] x 100. Because our formula was derived from a four-component model and a larger, more heterogeneous sample than the commonly used two-component formula, we recommend using it to convert Db to %BF for black men. Additionally, there was good agreement between dual-energy X-ray absorptiometry and the four-component model, making this a suitable alternative for estimating the %BF of black men.
Wagner
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Exercise and Sports Science Department, Vanguard University of Southern California, Costa Mesa, California 92626, USA. dwagner@vanguard.edu
Heyward
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D015502:Absorptiometry, Photon; D000328:Adult; D044383:Black People; D001823:Body Composition; D005223:Fats / Q000032:analysis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological
D005223:Fats