Tsuchiya Junko, Momose Kimito, Saito Hiroki, Watanabe Koji, Yamaguchi Tomofumi
Major of Physical Therapy, Department of Rehabilitation, School of Health Sciences, Tokyo University of Technology, Tokyo, Japan.
Department of Health Sciences, Graduate School of Medicine, Shinshu University, Nagano, Japan.
Front Neurosci. 2024 Dec 4;18:1485066. doi: 10.3389/fnins.2024.1485066. eCollection 2024.
Understanding the muscle synergies shared between pedaling and walking is crucial for elucidating the mechanisms of human motor control and establishing highly individualized rehabilitation strategies. This study investigated how pedaling direction and speed influence the recruitment of walking-like muscle synergies.
Twelve healthy male participants pedaled at three speeds (60 RPM, 30 RPM, and 80 RPM) in two rotational directions (forward and backward). Additionally, they completed walking tasks at three different speeds (slow, comfortable, and fast). Surface electromyography (EMG) was recorded on 10 lower limb muscles during movement, and muscle synergies were extracted from each condition using non-negative matrix factorization. The similarities between the muscle synergies during walking and each pedaling condition were examined using cosine similarity.
The results confirmed that the composition of muscle synergies during pedaling varied depending on the rotational direction and speed. Furthermore, one to three muscle synergies, similar to those observed during walking, were recruited in each pedaling condition, with specific synergies dependent on direction and speed. For instance, synergy involving the quadriceps and hip extensors was predominantly observed during pedaling at 30 RPM, regardless of the direction of rotation. Meanwhile, synergy involving the hamstrings was more pronounced during forward pedaling at 60 RPM and backward pedaling at 80 RPM.
These findings suggest that walking-like muscle synergies can be selectively recruited during pedaling, depending on the rotational direction and speed.
了解蹬踏和行走之间共享的肌肉协同作用对于阐明人类运动控制机制和制定高度个性化的康复策略至关重要。本研究调查了蹬踏方向和速度如何影响类似行走的肌肉协同作用的募集。
12名健康男性参与者以三种速度（60转/分钟、30转/分钟和80转/分钟）在两个旋转方向（向前和向后）进行蹬踏。此外，他们以三种不同速度（慢、舒适和快）完成行走任务。在运动过程中记录10条下肢肌肉的表面肌电图（EMG），并使用非负矩阵分解从每种情况下提取肌肉协同作用。使用余弦相似度检查行走过程中的肌肉协同作用与每种蹬踏情况之间的相似性。
结果证实，蹬踏过程中肌肉协同作用的组成因旋转方向和速度而异。此外，在每种蹬踏情况下都募集了一到三种类似于行走时观察到的肌肉协同作用，具体的协同作用取决于方向和速度。例如，无论旋转方向如何，在30转/分钟的蹬踏过程中主要观察到涉及股四头肌和髋伸肌的协同作用。同时，在60转/分钟的向前蹬踏和80转/分钟的向后蹬踏过程中，涉及腘绳肌的协同作用更为明显。
这些发现表明，在蹬踏过程中，可以根据旋转方向和速度选择性地募集类似行走的肌肉协同作用。
