THE INFLUENCE OF ELECTRODE POSITION ON BIPOLAR SURFACE ELECTROMYOGRAM RECORDINGS OF THE UPPER TRAPEZIUS MUSCLE
THE INFLUENCE OF ELECTRODE POSITION ON BIPOLAR SURFACE ELECTROMYOGRAM RECORDINGS OF THE UPPER TRAPEZIUS MUSCLE
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DOI：
10.1007/bf00864227
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发表时间：
1993-09-01
期刊：
影响因子：
--
通讯作者：
WESTGAARD, RH
中科院分区：
文献类型：
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作者：
JENSEN, C;VASSELJEN, O;WESTGAARD, RH
研究了上斜方肌电极位置对肌电信号振幅的影响，特别参考了手臂位置和力输出的估计。以前，尽管这种电极位置已被推荐（Zipp 1982, Eur J applephysiol 50:41-54），但在第七颈椎（C7）和肩峰之间的中间位置有肌电图（EMG）信号下降的报道（Veiersted 1991, Eur J applephysiol 62:91-98）。10名健康受试者在手臂垂直、外展和屈曲时进行最大肩抬，并进行动态运动测试。采用16通道双极阵列电极沿右上斜方肌长度记录肌电信号，时间分辨率为0.2 s。仅在C7和肩峰外侧边缘之间的中点外侧区域发现高且稳定的振幅（%变异系数为5.6）。在中点出现幅度曲线的下降，这可能是由于相对于肌肉的皮肤滑动而引起的手臂外展或屈曲轻微移位。在高信号幅值区域肌电力呈线性关系，而更侧向和倾斜区域肌电力呈高度可变关系。因此，当使用电极间距为2 cm的双极表面电极时，在C7和肩峰之间的中点外侧2 cm的中心位置提供了良好的重复性和高信号收率。
The effect of electrode position on the upper trapezius muscle on the myo-electric signal amplitude was investigated with special reference to arm position and estimate of force output. Previously, a depression of the electromyogram (EMG) signal has been reported midway between the seventh cervical vertebrae (C7) and acromion (Veiersted 1991, Eur J Appl Physiol 62:91-98) although this electrode position has been recommended (Zipp 1982, Eur J Appl Physiol 50:41-54). Ten healthy subjects performed maximal shoulder elevations with the arm in vertical, abducted and flexed positions and they performed a dynamic movement test. The myo-electric signal was recorded along the length of the right upper trapezius muscle by a 16-channel bipolar array electrode and was integrated with a 0.2-s time resolution. A region just lateral to the midpoint between C7 and the lateral edge of acromion was found with high and stable amplitudes (% coefficient of variation equalled 5.6). At the midpoint a dip in the amplitude profile appeared which was slightly displaced by arm abduction or flexion probably due to sliding of the skin relative to the muscle. A linear EMG-force relationship was found in the region with high signal amplitudes, whereas the more lateral and the dip region showed highly variable EMG-force relationships. Thus, it was found that when using bipolar surface electrodes with an interelectrode distance of 2 cm a centre position 2 cm lateral to the midpoint between C7 and acromion provided good repeatability and high signal yield.