Abstract
2002 Previous research (Med. Sci. Sports Exerc. 27:1686-1691, 1995) has shown that the BOD POD (BP), in comparison with hydrostatic weighing (HW), is both reliable and valid for repeated same-day assessment of body fat with the Siri 2-compartment model. We also showed with this model (unpublished data) that the BP is both reliable and valid for repeated assessment within a 7 day period. In the present study, 17 healthy subjects (6 men, 11 women) varying in age from 18-53y had body composition evaluated one week apart with the Siri 3-compartment model. Body density was determined with both the BP and HW methods, and used with total body water (estimated from D2O dilution procedures and respiratory water collection) in the 3-compartment model to estimate body fat and fat-free mass. Results showed that the differences in %Fat from week 1 to week 2 were not significant (0.9 +/− 0.7 %Fat, p > 0.05) with either method. The mean difference in %Fat (HW - BP) of 0.4 +/− 0.15% was small but statistically significant (p = 0.01). Correlation between methods for %Fat was r = 0.97. These findings are consistent with our 2-compartment model showing that the BP is both reliable and valid for determining % body fat with a one-week retest interval.
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