Motor unit synchronization during fatigue: Described with a novel sEMG method based on large motor unit samples
Motor unit synchronization during fatigue: Described with a novel sEMG method based on large motor unit samples
复制标题
DOI：
10.1016/j.jelekin.2007.08.008
复制
发表时间：
2009-04-01
影响因子：
2.5
通讯作者：
Roeleveld, K.
中科院分区：
文献类型：
--
作者：
Holtermann, A.;Groenlund, C.;Roeleveld, K.
记录的运动单位（MU）与疲劳同步的增加量及其与力震颤的可能关系差异很大，可能是由于肌肉激活不均匀以及方法上的差异和局限性。本研究的目的是应用一种新的表面肌电图（EMG）描述符MU同步的基础上大MU人口的MU同步检查在肌肉的不同部位的疲劳及其与震颤的关系的变化。24名受试者进行等长屈肘，最大随意收缩的25%，直到耗尽。单极肌电图信号记录使用130个电极的网格以上的肱二头肌。基于肌电信号的子带偏度和震颤的力的变异系数来估计MU同步的变化。同步描述符是依赖于记录的网站和增加与疲劳一起震颤。这两个参数之间存在一般关联，但它们的波动之间没有关联。这些结果与其他表面EMG研究一致，并表明新的描述符可用于获得疲劳期间无法用肌内EMG检索的大MU群体之间的同步信息。(c)2007爱思唯尔有限公司保留所有权利。
The amount of documented increase in motor unit (MU) synchronization with fatigue and its possible relation with force tremor varies largely, possibly due to inhomogeneous muscle activation and methodological discrepancies and limitations. The aim of this study was to apply a novel surface electromyographical (EMG) descriptor for MU synchronization based on large MU populations to examine changes in MU synchronization with fatigue at different sites of a muscle and its relation to tremor. Twenty-four subjects performed an isometric elbow flexion at 25% of maximal voluntary contraction until exhaustion. Monopolar EMG signals were recorded using a grid of 130 electrodes above the biceps brachii. Changes in MU synchronization were estimated based on the sub-band skewness of EMG signals and tremor by the coefficient of variation in force. The synchronization descriptor was dependent on recording site and increased with fatigue together with tremor. There was a general association between these two parameters, but not between their fluctuations. These results are in agreement with other surface EMG studies and indicate that the novel descriptor can be used to attain information of synchronization between large MU populations during fatigue that cannot be retrieved with intra-muscular EMG. (c) 2007 Elsevier Ltd. All rights reserved.