Resistivity and phase in localized BIA
Resistivity and phase in localized BIA
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DOI：
10.1088/0031-9155/44/10/304
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发表时间：
1999-10-01
影响因子：
3.5
通讯作者：
Coomler, K
中科院分区：
文献类型：
--
作者：
Shiffman, CA;Aaron, R;Coomler, K
我们描述了一种用于高重复性非侵入性射频阻抗测量的系统，作为沿身体节段(如大腿)的位置的函数。报告的结果主要是年龄在19岁到65岁之间，体重指数在15到40岁之间的健康男性和女性受试者。一个主要的结论是，阻抗的相位随着距离膝盖的增加而单调下降，平均值大大高于使用标准全身生物电阻抗分析(BIA)发现的平均值。为了补偿大腿的形状，使用基于肌肉、脂肪和骨骼分布的合理近似的解剖学模型进一步分析数据，得出平行于肌肉纤维的电流的有效电阻率的值。相位和电阻率结果参考Chertow等人对维持性血液透析患者的全身BIA研究以及本工作中观察到的可能的生理相关性进行了讨论。
We describe a system for highly reproducible non-invasive rf impedance measurements as a function of position along body segments such as the thigh. Results are reported for mainly healthy male and female subjects ranging in age from 19 to 65 and in body-mass index from 15 to 40. A principal conclusion is that the phase of the impedance falls monotonically with increasing distance from the knee, with average values substantially above what is found using standard, whole-body bioelectrical impedance analysis (BIA). To compensate for thigh shape, the data are further analysed using an anatomical model based on reasonable approximations for the distributions of muscle, fat and bone, yielding values of the effective resistivity for current flow parallel to the muscle fibres. The phase and resistivity results are discussed with reference to the whole-body BIA study of maintenance haemodialysis patients by Chertow et al, and in regard to possible physiological correlations observed in this work.