Aoyama Toshiyuki, Ae Kazumichi, Taguchi Takahiro, Kawamori Yuna, Sasaki Daisuke, Kawamura Takashi, Kohno Yutaka
Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences, Japan.
Faculty of Sport Culture, Nippon Sport Science University, Japan.
Heliyon. 2024 Dec 6;11(1):e41014. doi: 10.1016/j.heliyon.2024.e41014. eCollection 2025 Jan 15.
The yips is a coordination impairment partly attributed to task-specific dystonia in athletes. While previous research focused on comparisons between control and yips groups, this study aimed to highlight interindividual differences in the yips symptoms of two baseball players with distinct dystonic movements through electromyographic and kinematic analysis. Twelve male college baseball players with two exhibiting throwing yips symptoms participated in this study. A three-dimensional motion capture system was used to analyze the kinematic features of throwing motion. Electromyographic data was recorded from the throwing upper limb. Case 1 showed markedly greater elbow flexion before ball release than the control baseball players, likely due to excessive and delayed muscle contraction of the biceps brachii. Case 2 showed intermittent activity of the middle deltoid muscle impacting shoulder abduction movement, resulting in action tremor of the upper limb. This study revealed two distinct types of dystonic movements in baseball players with throwing yips: excessive joint motion, which may be caused by impaired timing and amount of muscle activity, and action tremor, associated with intermittent muscle activity. These findings underscore the importance of individualized kinematic and electromyographic analysis to understand and treat yips symptoms.
“易普症”是一种协调性障碍，部分归因于运动员的特定任务性肌张力障碍。虽然先前的研究集中在对照组和易普症组之间的比较，但本研究旨在通过肌电图和运动学分析，突出两名具有不同肌张力障碍动作的棒球运动员在易普症症状上的个体差异。十二名男性大学棒球运动员参与了本研究，其中两名表现出投掷易普症症状。使用三维运动捕捉系统分析投掷动作的运动学特征。从投掷上肢记录肌电图数据。案例1显示，在球释放前，肘部屈曲明显大于对照棒球运动员，这可能是由于肱二头肌肌肉收缩过度和延迟所致。案例2显示，三角肌中部肌肉的间歇性活动影响了肩关节外展运动，导致上肢动作性震颤。本研究揭示了患有投掷易普症的棒球运动员中两种不同类型的肌张力障碍动作：过度的关节运动，这可能是由肌肉活动的时间和量受损引起的；以及与间歇性肌肉活动相关的动作性震颤。这些发现强调了个性化运动学和肌电图分析对于理解和治疗易普症症状的重要性。
