Bell N A, McClure P D, Hill R J, Davies P S
School of Human Movement Studies, Faculty of Health, Queensland University of Technology, Brisbane, Australia.
Eur J Clin Nutr. 1998 Nov;52(11):856-9. doi: 10.1038/sj.ejcn.1600661.
To investigate the accuracy of foot-to-foot impedance methodology for the prediction of total body water and whether leg length rather than stature should be used in the prediction of total body water.
Cross-sectional study using volunteers from the community.
University laboratory.
57 subjects (29 male; 28 female) aged 19-56 y.
Total body water was measured using a deuterium oxide dilution technique. Total body water was also predicted using foot-to-foot impedance apparatus (Tanita Inc, Tokyo, Japan, Model TBF 305).
Mean values for predicted and measured total body water differed by 0.71. However this bias was not constant across all individuals with a progressive underestimation of total body water by foot-to-foot impedance technology as the water content of the body increases. Also the use of leg length did not improve the accuracy of the prediction equation.
At the population level predictions of total body water obtained from foot-to-foot impedance technology compare well with measured total body water. However the significant correlation between the difference between predicted and measured total body water and the absolute value for total body water is a concern especially if the technology is used for body composition assessment during a weight loss program.
研究足对足阻抗法预测总体水含量的准确性，以及在预测总体水含量时是否应使用腿长而非身高。
采用社区志愿者进行横断面研究。
大学实验室。
57名年龄在19 - 56岁的受试者（29名男性；28名女性）。
使用氧化氘稀释技术测量总体水含量。还使用足对足阻抗仪（日本东京Tanita公司，型号TBF 305）预测总体水含量。
预测的总体水含量与测量值的平均值相差0.71。然而，这种偏差在所有个体中并不恒定，随着身体含水量的增加，足对足阻抗技术对总体水含量的估计逐渐偏低。此外，使用腿长并未提高预测方程的准确性。
在总体人群水平上，通过足对足阻抗技术获得的总体水含量预测值与测量值比较吻合。然而，预测的总体水含量与测量值之间的差异和总体水含量绝对值之间的显著相关性令人担忧，特别是如果该技术用于减肥计划期间的身体成分评估。
