Discipline of Anatomy & Histology, School of Medical Sciences, Faculty of Medicine & Health, The University of Sydney, Australia.
Department of Rehabilitation Sciences, Faculty of Medicine & Health Sciences, Ghent University, Belgium.
J Electromyogr Kinesiol. 2020 Aug;53:102427. doi: 10.1016/j.jelekin.2020.102427. Epub 2020 May 19.
Because of its superficial location, surface electrodes are commonly used to record lower trapezius activity. Recent evidence, however, would suggest that surface electromyography is not a valid to record activity from other superficially placed shoulder muscles. Therefore, the aim of this study was to determine the validity of using surface electrodes to record lower trapezius activity. Ten asymptomatic subjects performed ramped isometric (0-100% maximum load) and dynamic (70% maximum load) shoulder tasks. Intramuscular electrodes were inserted into lower trapezius and rhomboid major. Surface electrodes were placed over lower trapezius around the intramuscular electrodes. Differences in the recorded activity of lower trapezius between surface and intramuscular electrodes were tested using a 2 factor repeated measures analysis of variance with factors: test and electrode type. Similarity in the recorded activity patterns between the two electrodes was tested using Pearson's correlation coefficient (r). Results indicated that there was no difference in lower trapezius activity levels (p = 0.98) or activation patterns (r ≥ 0.74) recorded by the intramuscular and surface electrodes. The results of this study indicate that any potential crosstalk contamination in the surface electrode signal is having little influence on the recorded activity from lower trapezius and therefore, support the common practice of surface electromyography to investigate lower trapezius function.
由于其表面位置，表面电极通常用于记录下斜方肌的活动。然而，最近的证据表明，表面肌电图并不是记录其他浅层肩部肌肉活动的有效方法。因此，本研究的目的是确定使用表面电极记录下斜方肌活动的有效性。十名无症状受试者进行了斜坡等长（0-100%最大负荷）和动态（70%最大负荷）肩部任务。将肌内电极插入下斜方肌和菱形肌。将表面电极放置在肌内电极周围的下斜方肌上。使用双因素重复测量方差分析测试表面和肌内电极记录的下斜方肌活动之间的差异，因素为：测试和电极类型。使用皮尔逊相关系数（r）测试两个电极记录的活动模式的相似性。结果表明，肌内和表面电极记录的下斜方肌活动水平（p=0.98）或激活模式（r≥0.74）没有差异。本研究的结果表明，表面电极信号中的任何潜在串扰污染对下斜方肌记录的活动影响很小，因此支持表面肌电图用于研究下斜方肌功能的常见做法。
