School of Health Sciences, Queen Margaret University, Edinburgh, UK.
J Electromyogr Kinesiol. 2011 Oct;21(5):827-33. doi: 10.1016/j.jelekin.2011.05.013. Epub 2011 Jul 12.
The identification of the motor unit (MU) innervation zone (IZ) using surface electromyographic (sEMG) signals detected on the skin with a linear array or a matrix of electrodes has been recently proposed in the literature. However, an analysis of the reliability of this procedure and, therefore, of the suitability of the sEMG signals for this purpose has not been reported. The purpose of this work is to describe the intra and inter-rater reliability and the suitability of surface EMG in locating the innervation zone of the upper trapezius muscle. Two operators were trained on electrode matrix positioning and sEMG signal analysis. Ten healthy subjects, instructed to perform a series of isometric contractions of the upper trapezius muscle participated in the study. The two operators collected sEMG signals and then independently estimated the IZ location through visual analysis. Results showed an almost perfect agreement for intra-rater and inter-rater reliability. The constancy of IZ location could be affected by the factors reflecting the population of active MUs and their IZs, including: the contraction intensity, the acquisition period analyzed, the contraction repetition. In almost all cases the IZ location shift due to these factors did not exceed 4mm. Results generalization to other muscles should be made with caution.
使用线性电极阵列或矩阵检测皮肤表面肌电图（sEMG）信号来识别运动单位（MU）支配区（IZ）最近在文献中被提出。然而，尚未有关于该程序可靠性的分析，因此也没有关于这些 sEMG 信号是否适用于该目的的报告。本研究的目的是描述表面肌电图在定位上斜方肌支配区方面的内在和外在可靠性以及适用性。两名操作人员接受了电极矩阵定位和 sEMG 信号分析方面的培训。十名接受过指示进行上斜方肌等长收缩的健康受试者参与了这项研究。两名操作人员采集了 sEMG 信号，然后通过视觉分析独立估计 IZ 的位置。结果显示，内在和外在可靠性的一致性几乎达到完美。IZ 位置的稳定性可能会受到反映活跃 MU 及其 IZ 群体的因素的影响，包括：收缩强度、分析的采集周期、收缩重复次数。在几乎所有情况下，由于这些因素导致的 IZ 位置偏移都不超过 4mm。应谨慎将结果推广到其他肌肉。
