PDF(Pubmed)
Abstract：
UNASSIGNED: The shoulder complex relies on scapular movement controlled by periscapular muscles for optimal arm function. However, minimal research has explored scapular muscle activation ratios during functional tasks, nor how they might be influenced by biological sex. This investigation aims to characterize how sex impacts scapular muscle activation ratios during functional tasks.
UNASSIGNED: Twenty participants (ten females, ten males) were assessed with surface electromyography (EMG) and motion tracking during seven functional tasks. Activation ratios were calculated from normalized EMG for the three trapezius muscles and serratus anterior. Scapular angles were calculated using a YXZ Euler sequence. Two-way mixed methods ANOVAs (p < .05) were used to assess the effects of sex and humeral elevation level on ratios and angles.
UNASSIGNED: Sex-based differences were present in the Tie Apron task, with males exhibiting higher upper trapezius/lower trapezius and upper trapezius/middle trapezius ratios than females. Males also demonstrated decreased internal rotation in this task. Other tasks showcased significant sex-based differences in scapular upward rotation but not in activation ratios. Humeral elevation generally demonstrated an inverse relationship with scapular muscle activation ratios.
UNASSIGNED: This study highlights sex-based differences in scapular muscle activation ratios during specific functional tasks, emphasizing the need to consider sex in analyses of shoulder movements. Normative activation ratios for functional tasks were provided, offering a foundation for future comparisons with non-normative groups. Further research is warranted to confirm and explore additional influencing factors, advancing our understanding of shoulder activation and movement in diverse populations.
UNASSIGNED: Twenty participants (ten females, ten males) were assessed with surface electromyography (EMG) and motion tracking during seven functional tasks. Activation ratios were calculated from normalized EMG for the three trapezius muscles and serratus anterior. Scapular angles were calculated using a YXZ Euler sequence. Two-way mixed methods ANOVAs (p < .05) were used to assess the effects of sex and humeral elevation level on ratios and angles.
UNASSIGNED: Sex-based differences were present in the Tie Apron task, with males exhibiting higher upper trapezius/lower trapezius and upper trapezius/middle trapezius ratios than females. Males also demonstrated decreased internal rotation in this task. Other tasks showcased significant sex-based differences in scapular upward rotation but not in activation ratios. Humeral elevation generally demonstrated an inverse relationship with scapular muscle activation ratios.
UNASSIGNED: This study highlights sex-based differences in scapular muscle activation ratios during specific functional tasks, emphasizing the need to consider sex in analyses of shoulder movements. Normative activation ratios for functional tasks were provided, offering a foundation for future comparisons with non-normative groups. Further research is warranted to confirm and explore additional influencing factors, advancing our understanding of shoulder activation and movement in diverse populations.
摘要：
■肩部复合体依靠肩胛骨周围肌肉控制的肩胛骨运动来实现最佳的手臂功能。然而,最少的研究探索了功能任务期间肩胛骨肌肉的激活率，也不知道它们如何受到生物性别的影响。这项研究旨在表征性别如何影响功能任务期间的肩胛骨肌肉激活率。
■20名参与者（10名女性，10名男性）在七个功能任务中通过表面肌电图（EMG）和运动跟踪进行了评估。根据标准化的EMG计算出三个斜方肌和前锯肌的激活率。使用YXZEuler序列计算肩胛骨角度。双向混合方法ANOVAs（p<.05）用于评估性别和肱骨抬高水平对比率和角度的影响。
■在TieApron任务中存在基于性别的差异，男性的上斜方肌/下斜方肌和上斜方肌/中斜方肌比率高于女性。在此任务中，雄性也显示出内部旋转减少。其他任务显示了肩胛骨向上旋转的显着性别差异，但激活率却没有。肱骨抬高通常与肩胛骨肌肉激活率成反比。
■这项研究强调了在特定功能任务期间肩胛骨肌激活率的性别差异，强调在分析肩部运动时需要考虑性别。提供了功能任务的规范激活率，为未来与非规范群体的比较奠定了基础。需要进一步的研究来确认和探索其他影响因素，提高我们对不同人群中肩部激活和运动的理解。
■20名参与者（10名女性，10名男性）在七个功能任务中通过表面肌电图（EMG）和运动跟踪进行了评估。根据标准化的EMG计算出三个斜方肌和前锯肌的激活率。使用YXZEuler序列计算肩胛骨角度。双向混合方法ANOVAs（p<.05）用于评估性别和肱骨抬高水平对比率和角度的影响。
■在TieApron任务中存在基于性别的差异，男性的上斜方肌/下斜方肌和上斜方肌/中斜方肌比率高于女性。在此任务中，雄性也显示出内部旋转减少。其他任务显示了肩胛骨向上旋转的显着性别差异，但激活率却没有。肱骨抬高通常与肩胛骨肌肉激活率成反比。
■这项研究强调了在特定功能任务期间肩胛骨肌激活率的性别差异，强调在分析肩部运动时需要考虑性别。提供了功能任务的规范激活率，为未来与非规范群体的比较奠定了基础。需要进一步的研究来确认和探索其他影响因素，提高我们对不同人群中肩部激活和运动的理解。
