EVALUATION OF METHODS TO MINIMIZE CROSS-TALK IN SURFACE ELECTROMYOGRAPHY
EVALUATION OF METHODS TO MINIMIZE CROSS-TALK IN SURFACE ELECTROMYOGRAPHY
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DOI：
10.1016/0021-9290(93)90086-t
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发表时间：
1993-01-01
影响因子：
2.4
通讯作者：
GRABINER, MD
中科院分区：
文献类型：
--
作者：
KOH, TJ;GRABINER, MD
这项研究的目的是量化各种方法在使用通用记录设备的表面肌电信号(EMG)中减少串扰的有效性，并比较这些方法记录的信号的日内和日间变化。比较了单差分(SD)、双差分(DD)和分支电极(BE)技术记录的大小电极和相应的电极间距离的信号。在最大自愿力(MVE)刺激小腿三头肌的过程中，采用一种通过胫骨神经电刺激小腿三头肌的方法来估计胫前肌EMG信号中的串扰。在SD信号中，对于大的和小的极间距离，串扰分别平均为12.2%和10.2%的MVE。与SD信号相比，DD和BE信号包含的串扰明显更少(技术和极间距离的MVE约为5%)。通过记录最大随意等长背屈时的胫骨前肌肌电信号(每2天3次试验)，并计算平均校正值和中位频率的变异系数，估计与这些方法相关的日内和日间变异。小电极间距记录的EMG信号比大电极间距记录的EMG信号具有更大的日间幅度变异性。在SD、DD和BE记录技术中，日内和日间幅度变化相似。在所有实验条件下，日内和日间的频率变化都是相似的。因此，DD和BE技术与大的电极间距离(和大电极)相结合，提供的信号比SD技术包含的串扰要少得多，而不牺牲日内和日间的幅度和频率稳定性。
The purposes of this study were to quantify the effectiveness of various methods to minimize cross talk in surface electromyography (EMG) using common recording equipment, and to compare the intra- and interday variabilities of signals recorded with these methods. Comparisons were made for signals recorded with the single differential (SD), double differential (DD) and branched electrode (BE) techniques with large and small electrodes and corresponding interelectrode distances. The amount of cross talk in tibialis anterior EMG signals during maximum voluntary effort (MVE) triceps surae excitation was estimated using a protocol involving electrical stimulation of the triceps surae via the tibial nerve. In SD signals, cross talk averaged 12.2 and 10.2 percent MVE, for the large and small interelectrode distances, respectively. DD and BE signals contained significantly less cross talk (approximately 5 percent MVE for both techniques and interelectrode distances) than SD signals. The intra- and interday variabilities associated with these methods were estimated by recording tibialis anterior EMG signals during maximum voluntary isometric dorsiflexion (3 trials on each of 2 days) and calculating coefficients of variation for average-rectified values and median frequencies. EMG signals recorded with the small interelectrode distance showed greater interday amplitude variability than those recorded with the large interelectrode distance. Intra- and interday amplitude variabilities were similar across SD, DD and BE recording techniques. Intra- and interday frequency variabilities were similar across all experimental conditions. Thus, the DD and BE techniques, in conjunction with the large interelectrode distance (and large electrodes), provide a signal which contains significantly less cross talk than the SD technique without sacrificing intra- and interday amplitude and frequency stability.