在男孩和男性的柔手指半径骨中,不同的离散运动单元激活模式
Stacey Woods1,2, Andrew McKiel1,2, Trent Herda3
1Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, St. Catharines, ON, L2S 3A1, Canada.
European journal of applied physiology
|January 29, 2024
概括
男孩在手腕曲过程中比男性更早和更低的力度来招募运动单元 (MU). 神经战略的这种差异可能解释了肌肉力量控制中的与年龄相关的变化.
科学领域:
- 神经肌肉生理学 神经肌肉生理学
- 发育运动控制 发育运动控制
背景情况:
- 与成年人相比,儿童可能表现出较低的高值运动单元 (MU) 激活.
- 研究离散MU激活的与年龄相关的差异对于理解运动发育至关重要.
研究的目的:
- 为了比较男孩和男性之间的 flexor carpi radialis (FCR) 肌肉中的离散运动单元 (MU) 激活.
- 阐明特定于年龄的力量生产神经战略.
主要方法:
- 表面电肌图 (EMG) 用于记录15名男孩和17名男子在异面手腕曲期间的MU动作潜力列车.
- 在形收缩过程中分析了动力单元招募值 (RT) 和动力单元发射率 (MUFR).
- 测量了最大的自愿对称手腕曲扭矩 (MVIC).
主要成果:
- 虽然在考虑体型后,MVIC在各组之间没有差异,但男孩的MUFR-RT斜率更,这表明MUFR随着RT的增加而下降.
- 与男性相比,男孩在收缩早期招募了更多的MU.
- 男孩和男孩之间的平均MUFR是相似的.
结论:
- 男孩倾向于比男性更早地招募MU,并且MVIC的百分比比较低.
- 这种MU招募策略的差异可能有助于观察到男孩的MUFR-RT斜率更.
- 研究结果表明,与年龄相关的不同神经策略在手腕 flexors中产生中等至高的力.
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