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较低的斜方肌活动。但是，最近的证据表明，表面肌电图不能有效地记录其他浅表肩部肌肉的活动。因此，本研究的目的是确定使用表面电极记录较低的斜方肌活动的有效性。十名无症状受试者进行了等距倾斜（最大负荷为0-100％）和动态（最大负荷为70％）肩部任务。肌内电极插入下斜方肌和菱形大管。将表面电极置于肌内电极周围的下斜方上方。使用两因素重复测量分析方差与因素来测试表面和肌内电极之间记录的下斜方肌活动的差异，这些因素与因素有关：测试和电极类型。使用皮尔森相关系数（r）测试了两个电极之间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较低的斜方肌活动水平（p = 0.98）或激活模式（r≥0.74）没有差异。这项研究的结果表明，表面电极信号中的任何潜在的串扰污染对下斜方肌记录的活动几乎没有影响，因此支持表面肌电图研究下斜方肌功能的常规做法。使用皮尔森相关系数（r）测试了两个电极之间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较低的斜方肌活动水平（p = 0.98）或激活模式（r≥0.74）没有差异。这项研究的结果表明，表面电极信号中的任何潜在的串扰污染对下斜方肌记录的活动几乎没有影响，因此，支持表面肌电图研究下斜方肌功能的常规做法。使用皮尔森相关系数（r）测试了两个电极之间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较低的斜方肌活动水平（p = 0.98）或激活模式（r≥0.74）没有差异。这项研究的结果表明，表面电极信号中的任何潜在的串扰污染对下斜方肌记录的活动几乎没有影响，因此支持表面肌电图研究下斜方肌功能的常规做法。74）由肌内和表面电极记录。这项研究的结果表明，表面电极信号中的任何潜在的串扰污染对下斜方肌记录的活动几乎没有影响，因此支持表面肌电图研究下斜方肌功能的常规做法。74）由肌内和表面电极记录。这项研究的结果表明，表面电极信号中的任何潜在的串扰污染对下斜方肌记录的活动几乎没有影响，因此，支持表面肌电图研究下斜方肌功能的常规做法。