The evaluation of elbow joint motion using bio-impedance signal

2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) Pub Date : 2017-06-01 DOI:10.1109/ECTICON.2017.8096223

Liu Renhe, B. Wongkittisuksa

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引用次数: 2

Abstract

Electromyography (EMG) method is widely used in motion detection based on physiological phenomenon. However, EMG technique doesn't fit to measure the dynamic parameter of motion. For instance, EMG is difficult to measure the joint angle changing. Bio-impedance method is a non-invasive, high performance method. This article evaluates the elbow joint movement using Bio-impedance, the correlation between the elbow joint angle changing and the upper arm bio-impedance changing has been calculated. A one-channel Bio-impedance measurement device with a goniometer has been designed in this study. The bio-impedance device generates high-frequency, low-intensity alternating constant current to human body and measure the bio-impedance signal. 20-kHz, 45-kHz, 50-kHz and 70-kHz has been investigated in the experiment. The one-channel bio-impedance measurement device includes of Wein oscillator, Howland constant current source, high-pass filter, the instrument amplifier INA 128, rectifier, low-pass filter and direct current coupling. Three electrode configurations were applied to compare the influence from each electrode configuration to the correlation calculation. Four male and two female have participated in the experiment of 70-kHz with three electrode configuration. In the experiment of 20-kHz, 45-Khz and 50-kHz, only one subject has participated in these experiments. The motion setting of 45-kHz is different with other frequency condition, it consists of 9 stages. Subject lifted their arms from 0 degrees to 80 degrees and kept their arm at each 10 degrees. The other motion setting consists of 4 stages. Subject lifted their arms from 0 degrees to 90 degrees and kept their arm at each 30 degrees. In multi-frequency with different electrode configurations condition, the result of 45-kHz, 50-kHz and 70-kHz contribute high correlation between the elbow joint angle changing and upper arm bio-impedance changing. However, the result of the 20-kHz condition is not stable. In the multi-subject experiment, each subject contributes high correlation result in the 70-kHz condition with three electrode configurations.

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用生物阻抗信号评价肘关节运动

肌电图(Electromyography, EMG)方法在基于生理现象的运动检测中得到了广泛的应用。然而，肌电图技术并不适合测量运动的动态参数。例如，肌电图难以测量关节角度的变化。生物阻抗法是一种无创、高性能的方法。用生物阻抗法评价肘关节运动，计算了肘关节角度变化与上臂生物阻抗变化的相关性。本研究设计了一种带角计的单通道生物阻抗测量装置。生物阻抗装置向人体产生高频、低强度的交流恒电流，并测量生物阻抗信号。实验研究了20 khz、45 khz、50 khz和70 khz。该单通道生物阻抗测量装置由Wein振荡器、Howland恒流源、高通滤波器、仪表放大器INA 128、整流器、低通滤波器和直流耦合器组成。采用三种电极结构比较不同电极结构对相关计算的影响。4男2女参加了70 khz三电极配置的实验。在20 khz、45 khz和50 khz的实验中，只有一名受试者参加了这些实验。45 khz的运动设定不同于其他频率条件，它由9个阶段组成。实验对象将手臂从0度举起到80度并保持每10度手臂的高度。其他动作设置由4个阶段组成。实验对象将手臂从0度举起到90度并保持每30度。在不同电极配置的多频率条件下，45 khz、50 khz和70 khz的结果与肘关节角度变化和上臂生物阻抗变化具有较高的相关性。然而，20 khz条件下的结果并不稳定。在多受试者实验中，在三种电极配置的70 khz条件下，每个受试者都贡献了高相关结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)

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