Measurement and evaluation in sports science, Soonchunhyang University, Chungman 336-745, Korea.
Nutr Res Pract. 2011 Jun;5(3):246-52. doi: 10.4162/nrp.2011.5.3.246. Epub 2011 Jun 21.
Bioelectrical impedance analysis (BIA) models must be validated against a reference method in a representative population sample before they can be accepted as accurate and applicable. The purpose of this study was to compare the eight-electrode BIA method with DEXA as a reference method in the assessment of body composition in Korean adults and to investigate the predictive accuracy and applicability of the eight-electrode BIA model. A total of 174 apparently healthy adults participated. The study was designed as a cross-sectional study. FM, %fat, and FFM were estimated by an eight-electrode BIA model and were measured by DEXA. Correlations between BIA_%fat and DEXA_%fat were 0.956 for men and 0.960 for women with a total error of 2.1%fat in men and 2.3%fat in women. The mean difference between BIA_%fat and DEXA_%fat was small but significant (P < 0.05), which resulted in an overestimation of 1.2 ± 2.2%fat (95% CI: -3.2-6.2%fat) in men and an underestimation of -2.0 ± 2.4%fat (95% CI: -2.3-7.1%fat) in women. In the Bland-Altman analysis, the %fat of 86.3% of men was accurately estimated and the %fat of 66.0% of women was accurately estimated to within 3.5%fat. The BIA had good agreement for prediction of %fat in Korean adults. However, the eight-electrode BIA had small, but systemic, errors of %fat in the predictive accuracy for individual estimation. The total errors led to an overestimation of %fat in lean men and an underestimation of %fat in obese women.
生物电阻抗分析（BIA）模型必须在代表性的人群样本中针对参考方法进行验证，才能被认为是准确和适用的。本研究的目的是比较八电极 BIA 方法与 DEXA 作为参考方法在韩国成年人身体成分评估中的应用，并研究八电极 BIA 模型的预测准确性和适用性。共有 174 名健康成年人参与了这项研究。研究设计为横断面研究。FM、%fat 和 FFM 通过八电极 BIA 模型进行估计，并通过 DEXA 进行测量。男性 BIA_%fat 和 DEXA_%fat 之间的相关性为 0.956，女性为 0.960，总误差为男性 2.1%fat，女性 2.3%fat。BIA_%fat 和 DEXA_%fat 之间的平均差异虽小但有统计学意义（P<0.05），这导致男性高估了 1.2±2.2%fat（95%CI：-3.2-6.2%fat），女性低估了-2.0±2.4%fat（95%CI：-2.3-7.1%fat）。在 Bland-Altman 分析中，66.0%的女性 BIA 的%fat 被准确估计在 3.5%fat 以内，86.3%的男性 BIA 的%fat 被准确估计。BIA 对韩国成年人%fat 的预测具有良好的一致性。然而，八电极 BIA 在预测个体估计的%fat 方面存在较小但系统性的误差。总误差导致瘦男性的%fat 高估和肥胖女性的%fat 低估。
