Fields D A, Wilson G D, Gladden L B, Hunter G R, Pascoe D D, Goran M I
Division of Physiology and Metabolism, Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
Med Sci Sports Exerc. 2001 Sep;33(9):1605-10. doi: 10.1097/00005768-200109000-00026.
This study was designed to compare the accuracy and bias in estimates of total body density (Db) by hydrostatic weighing (HW) and the BOD POD, and percent body fat (%fat) by the BOD POD with the four-compartment model (4C model) in 42 adult females. Furthermore, the role of the aqueous and mineral fractions in the estimation of body fat by the BOD POD was examined.
Total body water was determined by isotope dilution ((2)H(2)0) and bone mineral was determined by dual-energy x-ray absorptiometry. Db and %fat were determined by the BOD POD and HW. The 4C model of Baumgartner was used as the criterion measure of body fat.
HW Db (1.0352 g x cm(-3)) was not statistically different (P = 0.35) from BOD POD Db (1.0349 g x cm(-3)). The regression between Db by HW and the BOD POD significantly deviated from the line of identity (Db by HW = 0.90 x Db by BOD POD + 0.099; R(2) = 0.94). BOD POD %fat (28.8%) was significantly lower (P < 0.01) than %fat by the 4C model (30.6%). The regression between %fat by the 4C model and the BOD POD significantly deviated from the line of identity (%fat by 4C model = 0.88 x %fat by BOD POD + 5.41%; R(2) = 0.92). BOD POD Db and %fat showed no bias across the range of fatness. Only the aqueous fraction of the fat-free mass (FFM) had a significant correlation with the difference in %fat between the 4C model and the BOD POD.
These data indicate that the BOD POD underpredicted body fat as compared with the 4C model, and the aqueous fraction of the FFM had a significant effect on estimates of %fat by the BOD POD.
本研究旨在比较42名成年女性中，通过水下称重法（HW）和BOD POD测量全身密度（Db）的准确性和偏差，以及通过BOD POD与四室模型（4C模型）测量体脂百分比（%fat）的情况。此外，还研究了水相和矿物质部分在BOD POD估算体脂中的作用。
通过同位素稀释法（(2)H(2)0）测定全身水含量，通过双能X线吸收法测定骨矿物质含量。通过BOD POD和HW测定Db和%fat。将鲍姆加特纳的4C模型用作体脂的标准测量方法。
HW法测得的Db（1.0352 g/cm³）与BOD POD测得的Db（1.0349 g/cm³）在统计学上无显著差异（P = 0.35）。HW法测得的Db与BOD POD测得的Db之间的回归显著偏离恒等线（HW法测得的Db = 0.90×BOD POD测得的Db + 0.099；R² = 0.94）。BOD POD测得的%fat（28.8%）显著低于4C模型测得的%fat（30.6%）（P < 0.01）。4C模型测得的%fat与BOD POD测得的%fat之间的回归显著偏离恒等线（4C模型测得的%fat = 0.88×BOD POD测得的%fat + 5.41%；R² = 0.92）。BOD POD测得的Db和%fat在不同肥胖程度范围内均无偏差。只有去脂体重（FFM）的水相部分与4C模型和BOD POD测得的%fat差异具有显著相关性。
这些数据表明，与4C模型相比，BOD POD低估了体脂，且FFM的水相部分对BOD POD估算%fat有显著影响。
