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首页> 外文期刊>Journal of electromyography and kinesiology: Official journal of the International Society of Electrophysiological Kinesiology >Fatigue analysis of interference EMG signals obtained from biceps brachii during isometric voluntary contraction at various force levels
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Fatigue analysis of interference EMG signals obtained from biceps brachii during isometric voluntary contraction at various force levels

机译：肱二头肌肱肌肌电信号在等距自主收缩过程中在不同力水平下获得的干扰肌电信号的疲劳分析

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摘要

The aim of the present study was to test the applicability of indices of muscle fatigue to interference EMG signals detected at various distances from the end-plate region during isometric voluntary contractions at different force levels. Bar electrode with 12 leading off surfaces and 5 mm inter-pole distance was used to detect EMG from human m. biceps brachii. The sensitivity of the new spectral indices to detect muscle fatigue was higher than that of mean or median frequencies. Considerable variations in the characteristic frequencies and values of spectral indices that could reflect recruitment and/or rotation of MUs were found under submaximal efforts. The increase of the indices was considered as a sign of peripheral muscle fatigue while their decreasing could be a sign of de-recruitment of fatigued or/and recruitment of new MUs reflecting central fatigue. The sensitivity of the indices to fatigue depended on the electrode arrangement and its longitudinal position in respect of the end-plate region and ends of the muscle fibres. It was larger for the electrodes placed in the middle of the semi-fibre. To overcome the problem with inappropriate position of the electrode, one could use an electrode whose longitudinal dimension would cover the entire semi-length of the analyzed fibres.
机译：本研究的目的是测试在不同力水平下等距自主收缩过程中，在距终板区域不同距离处检测到的肌电干扰信号对肌肉疲劳指数的适用性。使用具有12个引出表面和5 mm极间距离的条形电极检测人m的EMG。肱二头肌。新光谱指数检测肌肉疲劳的敏感性高于平均频率或中值频率。在次最大的努力下，发现了可以反映MU的募集和/或旋转的特征频率和频谱指数值的巨大变化。指标的增加被认为是周围肌肉疲劳的标志，而指标的下降则可能是减少疲劳的征兆或/和反映中枢疲劳的新MU的征募。指标对疲劳的敏感性取决于电极布置及其相对于端板区域和肌肉纤维末端的纵向位置。放置在半纤维中间的电极更大。为了克服电极位置不合适的问题，可以使用一种电极，其纵向尺寸将覆盖被分析纤维的整个半长。

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