a School of International Liberal Studies, Chukyo University 101 Tokodachi, Kaizu-cho, Toyota-shi, Aichi 470-0393, Japan.
b College of Health and Welfare, J.F. Oberlin University 3758 Tokiwa-machi, Machida-shi, Tokyo 194-0294, Japan.
Appl Physiol Nutr Metab. 2017 Feb;42(2):157-165. doi: 10.1139/apnm-2016-0137. Epub 2016 Oct 14.
This study examined the validity of segmental bioelectrical impedance (BI) analysis for predicting the fat-free masses (FFMs) of whole-body and body segments in children including overweight individuals. The FFM and impedance (Z) values of arms, trunk, legs, and whole body were determined using a dual-energy X-ray absorptiometry and segmental BI analyses, respectively, in 149 boys and girls aged 6 to 12 years, who were divided into model-development (n = 74), cross-validation (n = 35), and overweight (n = 40) groups. Simple regression analysis was applied to (length)/Z (BI index) for each of the whole-body and 3 segments to develop the prediction equations of the measured FFM of the related body part. In the model-development group, the BI index of each of the 3 segments and whole body was significantly correlated to the measured FFM (R = 0.867-0.932, standard error of estimation = 0.18-1.44 kg (5.9%-8.7%)). There was no significant difference between the measured and predicted FFM values without systematic error. The application of each equation derived in the model-development group to the cross-validation and overweight groups did not produce significant differences between the measured and predicted FFM values and systematic errors, with an exception that the arm FFM in the overweight group was overestimated. Segmental bioelectrical impedance analysis is useful for predicting the FFM of each of whole-body and body segments in children including overweight individuals, although the application for estimating arm FFM in overweight individuals requires a certain modification.
本研究旨在检验节段生物电阻抗（BI）分析预测包括超重个体在内的儿童全身和身体各部位去脂体重（FFM）的有效性。在 149 名 6 至 12 岁的男孩和女孩中，分别使用双能 X 射线吸收法和节段 BI 分析测定手臂、躯干、腿部和全身的 FFM 和阻抗（Z）值，这些儿童被分为模型建立（n=74）、交叉验证（n=35）和超重（n=40）三组。简单回归分析应用于全身和 3 个节段的（长度）/Z（BI 指数），以建立与相关身体部位测量 FFM 的预测方程。在模型建立组中，3 个节段和全身的 BI 指数与测量的 FFM 显著相关（R=0.867-0.932，估计标准误差=0.18-1.44kg（5.9%-8.7%））。没有系统误差时，测量和预测的 FFM 值之间没有显著差异。将模型建立组中得出的每个方程应用于交叉验证组和超重组，测量和预测的 FFM 值以及系统误差之间没有显著差异，但超重组的手臂 FFM 被高估。节段生物电阻抗分析可用于预测包括超重个体在内的儿童全身和身体各部位的 FFM，尽管在超重个体中估计手臂 FFM 时需要进行一定的修正。
