Department of Electrical Engineering and Computer Science, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, Japan.
Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.
Sci Rep. 2021 Apr 15;11(1):8211. doi: 10.1038/s41598-021-87614-z.
How do skilled players change their motion patterns depending on motion effort? Pitchers commonly accelerate wrist and elbow joint rotations via proximal joint motions. Contrastingly, they show individually different pitching motions, such as in wind-up or follow-through. Despite the generality of the uniform and diverse features, effort-dependent effects on these features are unclear. Here, we reveal the effort dependence based on muscle activity data in natural three-dimensional pitching performed by skilled players. We extract motor modules and their effort dependence from the muscle activity data via tensor decomposition. Then, we reveal the unknown relations among motor modules, common features, unique features, and effort dependence. The current study clarifies that common features are obvious in distinguishing between low and high effort and that unique features are evident in differentiating high and highest efforts.
熟练运动员如何根据动作力度改变运动模式？投球手通常通过近端关节运动来加速手腕和肘部关节的旋转。相比之下，他们表现出不同的投球动作，如投球前的准备动作或随球动作。尽管具有普遍性和多样性的特征，但这些特征的力度依赖性影响尚不清楚。在这里，我们通过熟练运动员自然三维投球中的肌肉活动数据揭示了基于力度的效果。我们通过张量分解从肌肉活动数据中提取运动模块及其力度依赖性。然后，我们揭示了运动模块、共同特征、独特特征和力度依赖性之间未知的关系。本研究阐明了共同特征在区分低用力和高用力方面是明显的，而独特特征在区分高用力和最高用力方面是明显的。
