Inhomogeneities in muscle activation reveal motor unit recruitment
Inhomogeneities in muscle activation reveal motor unit recruitment
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DOI：
10.1016/j.jelekin.2004.09.003
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发表时间：
2005-04-01
影响因子：
2.5
通讯作者：
Karlsson, JS
中科院分区：
文献类型：
--
作者：
Holtermann, A;Roeleveld, K;Karlsson, JS
本文提出了一种利用多通道表面肌电(MCSEMG)来量化肌肉激活模式的空间变化的新方法，以研究运动单位招募的变化。该方法基于运动单位的不均匀分布，导致肌肉的空间不均匀激活。为了评估该方法，15名受试者进行了三次等长屈肘收缩，包括缓慢的正弦变化的力量变化，范围从最大自主收缩的0%到80%。将MCSEMG电极放置在10×13网格的二头肌上方。从所有通道中，计算了在整个记录过程中的0.5个S时期内双极导线的均方根值。此后，计算一个历元的均方根值与另一个历元的均方根值之间的相关系数。结果显示，在不同收缩水平下，RMS分布的空间变化一致，高达最大自主收缩的80%，并且当比较相同力量水平下的增加和减少收缩时。这些发现在受试者内和受试者之间是可重复的，并与生理现象一致，因此表明二头肌运动单位属性的空间不均质性可以用于研究运动单位招募的变化。(C)2004爱思唯尔有限公司。保留所有权利。
This paper presents a novel method to quantify spatial changes in muscle activation pattern by multi-channel surface electromyography (MCSEMG) in order to investigate motor unit recruitment variation. The method is based on non-uniform distributions of motor units that cause spatial inhomogeneous muscle activation. To evaluate the method, 15 subjects performed three isometric elbow flexion contractions consisting of slow sinusoidal changes in force ranging from 0% to 80% of the maximal voluntary contraction. MCSEMG electrodes were placed in a 10 x 13 grid over the biceps brachii muscle. From all channels, root mean square (RMS) values of bipolar leadings were computed over 0.5 s epochs over the whole recording. Thereafter, correlation coefficients were calculated between the RMS values at one epoch, with the RMS values at another epoch. Results showed consistent spatial changes in the distribution of RMS at different contraction levels up to 80% of maximal voluntary contraction and when comparing increasing and decreasing contractions at the same force level. These findings are reproducible within and between subjects, and in agreement with physiological phenomena and therefore indicate that the spatial inhomogencities of motor unit properties in the biceps brachii muscle can be used to study changes in motor unit recruitment. (c) 2004 Elsevier Ltd. All rights reserved.