von Werder Sylvie Charlotte Frieda Anneliese, Disselhorst-Klug Catherine
Department of Rehabilitation & Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University, Aachen, Germany.
Department of Rehabilitation & Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University, Aachen, Germany.
J Electromyogr Kinesiol. 2016 Jun;28:67-75. doi: 10.1016/j.jelekin.2016.03.004. Epub 2016 Apr 2.
How do synergistic muscles interact, when their contraction aims at stabilizing and fine-tuning a movement, which is induced by the antagonistic muscle? The aim of the study was to analyze the interaction of biceps and brachioradialis during fine-tuning control tasks in comparison to load bearing ones. The surface electromyogram of biceps, brachioradialis and triceps were examined in 15 healthy subjects in dynamic flexion and extension movements with different combinations of contraction levels, joint angles and angular velocities. The measurements were conducted in two configurations, where the torque due to an external load opposes the rotational direction of the elbow flexion (load bearing tasks) or the elbow extension (fine-tuning tasks). Whereas during load bearing control tasks, similar muscular activation of biceps and brachioradialis was observed for all joint angles, angular velocities and external loads, during fine-tuning control tasks a significant difference of the muscular activation of both flexors was observed for 1kg, F(3.639,47.305)=2.864, p=0.037, and 5kg of external load, F(1.570,21.976)=6.834, p=0.008. The results confirm the synergistic muscular activation of both flexors during load bearing tasks, but suggest different control strategies for both flexors when they comprise a fine-tuning control task.
当协同肌的收缩旨在稳定和微调由拮抗肌引发的运动时，它们是如何相互作用的？本研究的目的是分析在微调控制任务中肱二头肌和肱桡肌的相互作用，并与承重任务进行比较。在15名健康受试者进行动态屈伸运动时，通过不同收缩水平、关节角度和角速度的组合，检测肱二头肌、肱桡肌和肱三头肌的表面肌电图。测量在两种配置下进行，其中外部负载产生的扭矩与肘关节屈曲的旋转方向相反（承重任务）或与肘关节伸展的旋转方向相反（微调任务）。在承重控制任务中，在所有关节角度、角速度和外部负载下，肱二头肌和肱桡肌的肌肉激活情况相似；而在微调控制任务中，对于1kg的外部负载，F(3.639,47.305)=2.864，p=0.037，以及5kg的外部负载，F(1.570,21.976)=6.834，p=0.008，观察到两种屈肌的肌肉激活存在显著差异。结果证实了在承重任务中两种屈肌的协同肌肉激活，但表明当它们构成微调控制任务时，两种屈肌采用不同的控制策略。
