Inter-electrode spacing of surface EMG sensors: Reduction of crosstalk contamination during voluntary contractions
Inter-electrode spacing of surface EMG sensors: Reduction of crosstalk contamination during voluntary contractions
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DOI：
10.1016/j.jbiomech.2011.11.010
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发表时间：
2012-02-02
影响因子：
2.4
通讯作者：
Roy, Serge H.
中科院分区：
文献类型：
--
作者：
De Luca, Carlo J.;Kuznetsov, Mikhail;Roy, Serge H.
我们研究了使用条形和圆盘电极阵列，由小腿三头肌（串扰肌肉）产生的胫骨前肌（目标肌肉）表面肌电图（sEMG）信号中串扰污染程度的电极间间距的影响。串扰污染的程度进行了评估自愿恒定力等长收缩和步行过程中的动态收缩。单差信号的电极间距范围为5 mm至40 mm。此外，双差信号的电极间距为10 mm，使用条形电极阵列。目标肌肉处的串扰污染表示为检测到的串扰信号与目标肌肉信号的串扰信号的比率。对于80%MVC下的小腿三头肌收缩和10%MVC下的胫骨前肌收缩，40 mm间距的串扰污染率平均接近50%。对于单差记录，从10 mm间距获得最小串扰污染。结果表明，棒电极阵列和盘电极阵列之间没有显着差异。在行走过程中，胫骨前肌上的串扰污染对于常用的22 mm间距单差分盘传感器达到23%的水平，对于10 mm间距单差分杆传感器达到17%，对于10 mm双差分杆传感器达到8%。对于这两项研究，电极间距对串扰污染的影响具有统计学显著性。因此，当使用单个差分传感器收集sEMG信号时，串扰污染和电极间间距应该是步态研究中的一个严重问题。污染可能会扭曲目标肌肉信号，并误导其激活时间和力大小的解释。(C)2011爱思唯尔有限公司保留所有权利。
We investigated the influence of inter-electrode spacing on the degree of crosstalk contamination in surface electromyographic (sEMG) signals in the tibialis anterior (target muscle), generated by the triceps surae (crosstalk muscle), using bar and disk electrode arrays. The degree of crosstalk contamination was assessed for voluntary constant-force isometric contractions and for dynamic contractions during walking. Single-differential signals were acquired with inter-electrode spacing ranging from 5 mm to 40 mm. Additionally, double differential signals were acquired at 10 mm spacing using the bar electrode array. Crosstalk contamination at the target muscle was expressed as the ratio of the detected crosstalk signal to that of the target muscle signal. The crosstalk contamination ratio approached a mean of 50% for the 40 mm spacing for triceps surae muscle contractions at 80% MVC and tibialis anterior muscle contractions at 10% MVC. For single differential recordings, the minimum crosstalk contamination was obtained from the 10 mm spacing. The results showed no significant differences between the bar and disk electrode arrays. During walking, the crosstalk contamination on the tibialis anterior muscle reached levels of 23% for a commonly used 22 mm spacing single-differential disk sensor, 17% for a 10 mm spacing single-differential bar sensor, and 8% for a 10 mm double-differential bar sensor. For both studies the effect of electrode spacing on crosstalk contamination was statistically significant. Crosstalk contamination and inter-electrode spacing should therefore be a serious concern in gait studies when the sEMG signal is collected with single differential sensors. The contamination can distort the target muscle signal and mislead the interpretation of its activation timing and force magnitude. (C) 2011 Elsevier Ltd. All rights reserved.