Department of Professional Programs, Texas A&M International University, Laredo, TX; Department of Kinesiology, University of Alabama, Tuscaloosa, AL.
Nutr Res. 2018 Jun;54:33-39. doi: 10.1016/j.nutres.2018.03.003. Epub 2018 Apr 5.
Bioimpedance analysis (BIA) and dual energy X-ray absorptiometry (DXA) are commonly utilized for total and segmental body composition assessment, but the agreement between these methods varies. Group (i.e., constant error [CE]) and individual error (i.e., standard error of estimate [SEE] and 95% limits of agreement [LOAs]) of single-frequency BIA were determined in apparently healthy men and women (n = 28 and 45, respectively) when using DXA as a reference method. It was hypothesized that single-frequency BIA would provide lower error for the estimation of total and segmental FFM than FM and BF%. The CE for many of the total and segmental body composition comparisons revealed statistically significant (all P < .05) mean differences (FM, FM, FFM, FFM, FFM, FFM, BF% and BF% for both sexes as well as FM and BF% for women and FM and FM for men). Although there were significant CEs for many comparisons, the individual error (i.e., SEEs and 95% LOAs) for total and segmental FFM were small whereas FM and BF% were large. Furthermore, the individual error tended to be larger for men than women when estimating FM and BF%, which is likely attributed to the larger segmental mass of men. This finding indicates the agreement between single-frequency BIA and DXA varies based on sex and segmental mass. Consequently, single-frequency BIA can be used for total and segmental FFM, but is not recommended for FM and BF%.
生物阻抗分析（BIA）和双能 X 射线吸收法（DXA）常用于评估总体和分段的身体成分，但这些方法的一致性存在差异。本研究旨在确定单频 BIA 的组间（即恒误差[CE]）和个体误差（即估计标准误差[SEE]和 95%一致性界限[LOA]），研究对象为 28 名和 45 名健康的男性和女性（分别为男性和女性），并以 DXA 为参考方法。研究假设单频 BIA 对总体和分段去脂体重（FFM）的估计误差将低于脂肪质量（FM）和体脂百分比（BF%）。许多总体和分段身体成分比较的 CE 显示出统计学上的显著差异（所有 P<0.05），均存在均值差异（FM、FM、FFM、FFM、FFM、FFM、BF%和 BF%，男女均有，女性的 FM 和 BF%以及男性的 FM 和 FM）。尽管许多比较存在显著的 CE，但总体和分段 FFM 的个体误差（即 SEE 和 95% LOA）较小，而 FM 和 BF%较大。此外，当估计 FM 和 BF%时，男性的个体误差往往大于女性，这可能归因于男性的分段质量较大。该研究结果表明，单频 BIA 和 DXA 的一致性因性别和分段质量而异。因此，单频 BIA 可用于总体和分段 FFM，但不推荐用于 FM 和 BF%。
