A comparison of air displacement plethysmography with three other techniques to determine body fat in healthy adults.

摘要: BACKGROUND This study compared air displacement plethysmography (ADP), which relies on measurements of body density to estimate fat, with three other techniques that measure composition: (1) hydrostatic weighing (HW), also measures density; (2) bioelectrical impedance (BIA), determines electrical resistance and total water fat-free mass; (3) dual-energy x-ray absorptiometry (DXA), bone, soft tissue masses. METHODS ADP, HW, BIA, DXA were performed 20 healthy volunteers (10 males 10 females). The subjects within 20% ideal weight, 31.1 +/- 1.8 years age, 75.4 2.7 kg mass index values 25.2 0.9 (kg/m2) percent fat by ADP ranging from 6.0% 41.0%. RESULTS Percent the four methods highly correlated (r > .90, p < .0001). Mean as determined 23.4% 2.3%, 23.9% +/-1.8%, 23.1% 1.9%, 26.4% 2.4%, respectively (* .05 vs ADP). There was a significantly positive slope (+0.23) for individual differences average HW demonstrating slightly negative difference at lower levels greater levels. Although similar entire population, there significant gender measured being 16% less in 7% females than HW. CONCLUSIONS Body using those across relatively wide range adults. These results support utility new technique estimation However, error associated level is not negligible requires further investigation.