Collins M A, Millard-Stafford M L, Sparling P B, Snow T K, Rosskopf L B, Webb S A, Omer J
Exercise Research Laboratory, Department of Health and Performance Sciences, Georgia Institute of Technology, Atlanta 30332-0110, USA.
Med Sci Sports Exerc. 1999 Sep;31(9):1350-6. doi: 10.1097/00005768-199909000-00019.
The purpose of this investigation was to evaluate the accuracy of a new air displacement plethysmograph, BOD POD Body Composition System, for determining %fat in collegiate football players.
Body fatness was estimated from body density (Db), which was measured on the same day using the BOD POD and hydrostatic weighing (HW) in 69 Division IA football players. In addition, 20 subjects were whole body scanned using dual-energy x-ray absorptiometry, DXA (Lunar DPX-L) to assess total body mineral content and %fat. Mineral content and HW determined Db were used to compute %fat from a three-component model (3C; fat, mineral, and residual).
Test-retest reliability for assessing %fat using the BOD POD (N = 15) was 0.994 with a technical error of measurement of 0.448%. Mean (+/- SEM) Db measured with the BOD POD (1.064 +/- 0.002 g x cc(-1) was significantly greater (P < 0.05) than HW (1.060 +/- 0.002 g x cc(-1)), thus resulting in a lower %fat for the BOD POD (15.1 +/- 0.8%) compared with HW (17.0 +/- 0.8%). Similar results (N = 20) were found for DXA (12.9 +/- 1.2%) and the 3C (12.7 +/- 0.8%) where %fat scores were significantly higher (P < 0.05) than scores determined using the BOD POD (10.9 +/- 1.0%).
Db measured with the BOD POD was higher than the criterion HW, thus yielding lower %fat scores for the BOD POD. In addition, BOD POD determined %fat was lower than DXA and 3C determined values in a subgroup of subjects. Assessment of %fat using the BOD POD is reliable and requires minimal technical expertise; however, in this study of collegiate football players, %fat values were underpredicted when compared to HW, DXA, and the 3C model.
本研究旨在评估一种新型空气置换体积描记仪——BOD POD身体成分分析系统，用于测定大学橄榄球运动员体脂百分比的准确性。
通过身体密度（Db）估算体脂率，69名一级联盟橄榄球运动员在同一天使用BOD POD和水下称重法（HW）测量身体密度。此外，20名受试者使用双能X线吸收法（DXA，Lunar DPX-L）进行全身扫描，以评估全身矿物质含量和体脂百分比。矿物质含量和通过HW测定的Db用于从三成分模型（3C；脂肪、矿物质和剩余部分）计算体脂百分比。
使用BOD POD评估体脂百分比（N = 15）的重测信度为0.994，测量技术误差为0.448%。用BOD POD测量的平均（±标准误）Db（1.064±0.002 g·cc⁻¹）显著高于HW（1.060±0.002 g·cc⁻¹）（P < 0.05），因此与HW（17.0±0.8%）相比，BOD POD得出的体脂百分比更低（15.1±0.8%）。在DXA（12.9±1.2%）和3C模型（12.7±0.8%）中也发现了类似结果，其体脂百分比得分显著高于使用BOD POD测定的得分（10.9±1.0%）（P < 0.05）。
用BOD POD测量的Db高于标准的HW，因此BOD POD得出的体脂百分比得分更低。此外，在一组受试者中，BOD POD测定的体脂百分比低于DXA和3C模型测定的值。使用BOD POD评估体脂百分比是可靠的，且所需技术专业知识最少；然而在这项对大学橄榄球运动员的研究中，与HW、DXA和3C模型相比，BOD POD得出的体脂百分比值被低估了。
