Temporal and quantitative variability in muscle electrical activity decreases as dexterous hand motor skills are learned
Temporal and quantitative variability in muscle electrical activity decreases as dexterous hand motor skills are learned
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DOI：
10.1371/journal.pone.0236254
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发表时间：
2020-07-20
期刊：
影响因子：
3.7
通讯作者：
Kohno, Yutaka
中科院分区：
文献类型：
--
作者：
Aoyama, Toshiyuki;Kohno, Yutaka
在运动学习过程中，肌肉活动在数量上和时间上发生变化。然而，肌肉电活动的可变性和灵巧手运动的学习和表现之间的关联还没有得到很好的理解。因此，我们进行了这项研究，以调查肌肉活动的时间和数量的变化和运动技能的学习之间的关系。38名健康的参与者进行了30次测试，测量了使用非惯用手旋转两个软木球20次所需的时间。记录拇短展肌（APB）、第一骨间背侧肌和趾伸肌（艾德）的肌电活动。通过计算EMG激活的持续时间和面积的变异系数来评估EMG活动的时间和数量变异性。随着运动学习的进行，任务完成得更快，EMG变异性降低。对于所有三块肌肉，观察到个体参与者的球旋转时间和EMG变异性之间存在显著相关性。此外，在APB和艾德肌肉的球旋转时间的改善和EMG变异性的减少之间观察到显著的正相关性。这些新的发现提供了重要的见解肌肉活动和精细运动技能的学习的时间和数量的变化之间的关系。
Muscle activity changes quantitatively and temporally during the motor learning process. However, the association between variability in muscle electrical activity and the learning and performance of dexterous hand movements is not well understood. Therefore, we undertook this study to investigate the relationships between temporal and quantitative variabilities in muscle activity and the learning of motor skills. Thirty-eight healthy participants performed 30 trials of a task that measured the time taken to rotate two cork balls 20 times using their non-dominant hand. The electromyographic (EMG) activities of the abductor pollicis brevis (APB), first dorsal interosseous, and extensor digitorum (ED) muscles were recorded. Temporal and quantitative variabilities in the EMG activity were evaluated by calculating the coefficient of variation of the duration and area of EMG activation. As motor learning proceeded, the task was completed more quickly and the EMG variability decreased. For all three muscles, significant correlations were observed between individual participants' ball rotation time and EMG variability. Furthermore, significant positive correlations were observed between improvement in ball rotation time and reduction in EMG variability for the APB and ED muscles. These novel findings provide important insights regarding the relationships between temporal and quantitative variabilities in muscle activity and the learning of fine motor skills.