The central nervous system does not control multiple muscles independently, whereas it manipulates a musculoskeletal system with redundant degrees of freedom. In specific, muscle synergy that represents muscle coordination realizes an advanced motion control of human body. In the pedaling exercise, the coordinated muscle activity between lower extremities is key for high‐efficient exercise when cyclists use binding pedals which fixes both pedals and shoes via cleats. Under the present circumstances, few reports focused on the muscle coordination of both legs. Thus, the relationship between the coordination of both legs and the mechanism of pedaling has not yet been clarified. In this study, we investigated the muscle synergy hidden in lower extremities by measuring surface electromyography and crank rotation angle during pedaling exercise under different mechanical constraints. In the results, this study confirmed the muscle cooperativeness formed by both the left and right leg during pedaling. Besides, the muscle cooperativeness had different roles on both legs because this coordination was asymmetrical regardless of the changes in cadence and workload. The muscle coordination formed by both legs was considered to be an evaluation index that could explain how the left and right legs were coordinated for effective pedaling with binding pedals.

中文翻译：

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基于脚下运动过程中下肢的肌肉协同作用的脚下技巧评估

中枢神经系统不会独立控制多条肌肉，而会以多余的自由度来操纵肌肉骨骼系统。具体而言，代表肌肉协调性的肌肉协同作用实现了对人体的高级运动控制。在蹬踏运动中，当骑自行车者使用绑定踏板通过绑带固定踏板和鞋子时，下肢之间协调的肌肉活动是高效锻炼的关键。在目前情况下，很少有报道关注双腿的肌肉协调性。因此，双腿的协调与蹬踏机制之间的关系尚未弄清。在这个研究中，我们通过测量在不同机械约束下的踩踏运动过程中的表面肌电图和曲柄旋转角度来调查下肢隐藏的肌肉协同作用。结果，该研究证实了踩踏时左右腿形成的肌肉协作性。此外，由于脚踏圈速和工作量的变化，这种协调性是不对称的，因此两条腿的肌肉协作具有不同的作用。两条腿形成的肌肉协调性被认为是一个评估指标，可以解释左腿和右腿如何通过约束踏板有效地进行蹬踏。肌肉的协调性在双腿上具有不同的作用，因为这种协调是不对称的，而与节奏和工作量的变化无关。两条腿形成的肌肉协调性被认为是一个评估指标，可以解释左腿和右腿如何通过约束踏板有效地进行蹬踏。肌肉的协作在两条腿上都有不同的作用，因为这种协调是不对称的，而与节奏和工作量的变化无关。两条腿形成的肌肉协调性被认为是一个评估指标，可以解释左腿和右腿如何通过约束踏板有效地进行蹬踏。