Interindividual differences in upper limb muscle synergies during baseball throwing motion in male college baseball players
Interindividual differences in upper limb muscle synergies during baseball throwing motion in male college baseball players
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DOI：
10.1016/j.jbiomech.2022.111384
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发表时间：
2022-11-17
影响因子：
2.4
通讯作者：
Kohno，Yutaka
中科院分区：
文献类型：
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作者：
Aoyama，Toshiyuki;Ae，Kazumichi;Kohno，Yutaka
投掷是人类的一种基本运动行为，它的发展是为了帮助狩猎和防御掠食者。对于现代人类来说，准确的投掷是许多运动中所需的一项重要技能。然而，棒球投掷过程中肌肉的时空协调尚未完全阐明。我们在此旨在确定棒球投掷中涉及的肌肉协同作用，并确定它们的时空模式是否在个体之间共享。十名大学棒球运动员参与了这项研究。在全力投掷过程中记录同侧 13 块上肢肌肉的肌电活动。使用非负矩阵分解来提取棒球投掷过程中的运动模块组成和时间激活模式，然后进行 k 均值分析，根据提取的运动模块的相似性对它们进行聚类。为每个玩家提取了四个运动模块。这些被分为四个簇（簇 1-4），每个簇从早期待发阶段到球释放依次达到活动峰值。由早期翘起到晚期翘起过渡期间激活的肌肉组成的肌肉协同簇（簇 2）的时空个体间相似性显着低于其他簇。不存在个体特异性的肌肉协同作用。这些结果表明，通过多年练习获得的熟练棒球投掷动作可能由四种基本肌肉协同作用组成，这些协同作用在时空模式存在一些差异的个体中很常见。
Throwing is a fundamental human motor behavior that has evolved to aid hunting and defense against predators. In modern humans, accurate throwing is an important skill required in many sports. However, the spatiotemporal coordination of muscles during baseball throwing has not been fully elucidated. We herein aimed to identify the muscle synergies involved in baseball throwing and determine whether their spatiotemporal patterns are shared among individuals. Ten college baseball players participated in this study. Electromyographic activity was recorded from 13 ipsilateral upper limb muscles during throwing using full effort. Non-negative matrix factorization was used to extract the motor module composition and temporal activation patterns during baseball throwing, followed by k-means analysis to cluster the extracted motor modules based on their similarity. Four motor modules were extracted for each player. These were classified into four clusters (Clusters 1–4), each reaching the peak activity sequentially from the early cocking phase to ball release. Spatiotemporal interindividual similarity in the muscle synergy cluster comprising the muscles activated during the transition from early cocking to late cocking (Cluster 2) was significantly lower than that in the other clusters. There was no individual-specific muscle synergy. These results suggest that the skilled baseball throwing motion acquired through years of practice may consist of four basic muscle synergies that are common among individuals with some differences in their spatiotemporal patterns.