Barbero Marco, Falla Deborah, Mafodda Luca, Cescon Corrado, Gatti Roberto
*Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Switzerland †School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK ‡Pain Clinic, Center for Anesthesiology, Emergency and Intensive Care Medicine, University Hospital Göttingen, Göttingen, Germany §Rehabilitation Department, San Raffaele Hospital, Milan, Italy.
Clin J Pain. 2016 Dec;32(12):1044-1052. doi: 10.1097/AJP.0000000000000373.
To apply topographical mapping of the electromyography (EMG) amplitude recorded from the upper trapezius muscle to evaluate the distribution of activity and the location of peak activity during a shoulder elevation task in participants with and without myofascial pain and myofascial trigger points (MTrP) and compare this location with the site of the MTrP.
Thirteen participants with myofascial pain and MTrP in the upper trapezius muscle and 12 asymptomatic individuals participated. High-density surface EMG was recorded from the upper trapezius muscle using a matrix of 64 surface electrodes aligned with an anatomic landmark system (ALS). Each participant performed a shoulder elevation task consisting of a series of 30 s ramped contractions to 15% or 60% of their maximal voluntary contraction (MVC) force. Topographical maps of the EMG average rectified value were computed and the peak EMG amplitude during the ramped contractions was identified and its location determined with respect to the ALS. The location of the MTrP was also determined relative to the ALS and Spearman correlation coefficients were used to examine the relationship between MTrP and peak EMG amplitude location.
The location of the peak EMG amplitude was significantly (P<0.05) different between groups (participants with pain/MTrP: -0.32±1.2 cm at 15% MVC and -0.35±0.9 cm at 60% MVC relative to the ALS; asymptomatic participants: 1.0±1.3 cm at 15% MVC and 1.3±1.1 cm relative to the ALS). However, no correlation was observed between the position of the MTrP and peak EMG amplitude during the ramped contractions at either force level (15%: rs=0.039, P=0.9; 60%: rs=-0.087, P=0.778).
People with myofascial pain and MTrP displayed a caudal shift of the distribution of upper trapezius muscle activity compared with asymptomatic individuals during a submaximal shoulder elevation task. For the first time, we show that the location of peak muscle activity is not associated with the location of the MTrP.
应用从斜方肌上部记录的肌电图（EMG）振幅地形图，评估有无肌筋膜疼痛和肌筋膜触发点（MTrP）的参与者在肩部抬高任务期间的活动分布和峰值活动位置，并将该位置与MTrP的部位进行比较。
13名患有斜方肌上部肌筋膜疼痛和MTrP的参与者以及12名无症状个体参与研究。使用与解剖标志系统（ALS）对齐的64个表面电极矩阵从斜方肌上部记录高密度表面肌电图。每位参与者执行一项肩部抬高任务，包括一系列30秒的逐渐增加收缩至其最大自主收缩（MVC）力的15%或60%。计算EMG平均整流值的地形图，并确定逐渐增加收缩期间的EMG峰值振幅，并相对于ALS确定其位置。还相对于ALS确定MTrP的位置，并使用Spearman相关系数检查MTrP与EMG峰值振幅位置之间的关系。
两组之间EMG峰值振幅的位置存在显著差异（P<0.05）（疼痛/MTrP参与者：相对于ALS，在15%MVC时为-0.32±1.2厘米，在60%MVC时为-0.35±0.9厘米；无症状参与者：在15%MVC时为1.0±1.3厘米，相对于ALS为1.3±1.1厘米）。然而，在任一力水平的逐渐增加收缩期间，未观察到MTrP的位置与EMG峰值振幅之间存在相关性（15%：rs=0.039，P=0.9；60%：rs=-0.087，P=0.778）。
与无症状个体相比，患有肌筋膜疼痛和MTrP的人在次最大肩部抬高任务期间，斜方肌上部肌肉活动分布出现尾侧移位。我们首次表明，肌肉峰值活动的位置与MTrP的位置无关。
