Colyer Steffi L, McGuigan Polly M
Department for Health, University of Bath, Bath, UK.
J Sports Sci Med. 2018 Mar 1;17(1):101-109. eCollection 2018 Mar.
Textile electromyography (EMG) electrodes embedded in clothing allow muscle excitation to be recorded in previously inaccessible settings; however, their ability to accurately and reliably measure EMG during dynamic tasks remains largely unexplored. To quantify the validity and reliability of textile electrodes, 16 recreationally active males completed two identical testing sessions, within which three functional movements (run, cycle and squat) were performed twice: once wearing EMG shorts (measuring quadriceps, hamstrings and gluteals myoelectric activity) and once with surface EMG electrodes attached to the vastus lateralis, biceps femoris and gluteus maximus. EMG signals were identically processed to provide average rectified EMG (normalized to walking) and excitation length. Results were compared across measurement systems and demonstrated good agreement between the magnitude of muscle excitation when EMG activity was lower, but agreement was poorer when excitation was higher. The length of excitation bursts was consistently longer when measured using textile vs. surface EMG electrodes. Comparable between-session (day-to-day) repeatability was found for average rectified EMG (mean coefficient of variation, CV: 42.6 and 41.2%) and excitation length (CV: 12.9 and 9.8%) when using textile and surface EMG, respectively. Additionally, similar within-session repeatability (CV) was recorded for average rectified EMG (13.8 and 14.1%) and excitation length (13.0 and 12.7%) for textile and surface electrodes, respectively. Generally, textile EMG electrodes appear to be capable of providing comparable muscle excitation information and reproducibility to surface EMG during dynamic tasks. Textile EMG shorts could therefore be a practical alternative to traditional laboratory-based methods allowing muscle excitation information to be collected in more externally-valid training environments.
嵌入衣物中的纺织肌电图（EMG）电极能够在以前难以进入的环境中记录肌肉兴奋情况；然而，它们在动态任务中准确可靠地测量肌电图的能力在很大程度上仍未得到探索。为了量化纺织电极的有效性和可靠性，16名有休闲运动习惯的男性完成了两个相同的测试环节，在每个环节中，进行了三种功能性动作（跑步、骑自行车和深蹲）各两次：一次穿着EMG短裤（测量股四头肌、腘绳肌和臀肌的肌电活动），另一次在股外侧肌、股二头肌和臀大肌上附着表面EMG电极。对EMG信号进行相同处理，以提供平均整流肌电图（归一化至步行状态）和兴奋时长。对不同测量系统的结果进行比较，结果表明，当EMG活动较低时，肌肉兴奋幅度之间的一致性良好，但当兴奋程度较高时，一致性较差。使用纺织EMG电极与表面EMG电极测量时，兴奋爆发的时长始终更长。分别使用纺织EMG和表面EMG时，平均整流肌电图（平均变异系数，CV：42.6%和41.2%）和兴奋时长（CV：12.9%和9.8%）具有可比的会话间（每日）重复性。此外，纺织电极和表面电极的平均整流肌电图（13.8%和14.1%）和兴奋时长（13.0%和12.7%）的会话内重复性（CV）相似。一般来说，纺织EMG电极似乎能够在动态任务中提供与表面EMG相当的肌肉兴奋信息和可重复性。因此，纺织EMG短裤可能是传统实验室方法的一种实用替代方案，能够在更具外部效度的训练环境中收集肌肉兴奋信息。
