Wu B, Hu X, Xu J
Fujian Institute of Traditional Chinese Medicine, Fuzhou.
Zhen Ci Yan Jiu. 1993;18(2):104-7.
The skin impedance has been used as an index to plot out the meridian courses. In most of this kind of methods during measurement voltage was necessary to deliver to the subject's skin. It is unknown whether increasing the measuring voltage can change non-low skin impedance points (non-LSIP) into low skin impedance points (LSIP). In order to clarify the problem, we made an investigation on the effect of increasing and decreasing the measuring voltage on skin impedance. Subjects under observation were 12 healthy volunteers. On the medial side of forearm two levels were selected for measurement. Four or twenty non-LISP were observed on each level. The measuring system worked on the basis of bioelectrode method. The measurement and data processing were controlled by microcomputer. During measurement impedance of LSIP decreased correspondingly with the increase of voltage and vice versa, but the value of impedance was not exceeded 100k omega in spite of increasing or decreasing the voltage. That is, low impedance is the inherent characteristics of LSIP. On the contrary, the impedance of non-LSIP remained in higher than 600k omega in most of cases during increasing voltage from 10 to 50v. As the voltage increased to 65v, the impedance in a part of non-LSIP decreased to such a low level as LSIP. However, their impedance increased rapidly to high level again once the measuring voltage decreased. The above results reveal that the response of non-LSIPs and LSIPs were different from each other in nature. Increasing the voltage could not change a non-LSIP into LSIP.(ABSTRACT TRUNCATED AT 250 WORDS)
皮肤阻抗已被用作描绘经络路线的一个指标。在大多数此类方法中，测量过程中需要向受试者的皮肤施加电压。尚不清楚增加测量电压是否会将非低皮肤阻抗点（non-LSIP）转变为低皮肤阻抗点（LSIP）。为了阐明这个问题，我们研究了测量电压增减对皮肤阻抗的影响。观察对象为12名健康志愿者。在前臂内侧选择两个部位进行测量。每个部位观察4个或20个非低阻抗点。测量系统基于生物电极法工作。测量和数据处理由微型计算机控制。测量过程中，LSIP的阻抗随电压升高而相应降低，反之亦然，但无论电压升高或降低，阻抗值均未超过100kΩ。也就是说，低阻抗是LSIP的固有特征。相反，在电压从10V增加到50V的过程中，大多数情况下non-LSIP的阻抗保持在600kΩ以上。当电压增加到65V时，一部分non-LSIP的阻抗降低到与LSIP一样低的水平。然而，一旦测量电压降低，它们的阻抗又会迅速回升到高水平。上述结果表明，non-LSIP和LSIP的反应本质上是不同的。增加电压并不能将non-LSIP转变为LSIP。（摘要截短于250字）
