动力单元的调整有助于在损伤阻力练习后重复的冲击效应
Oliver Hayman1,2,3, Paul Ansdell1, Luca Angius1
1Department of Sport, Exercise & Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle upon-Tyne, UK.
Journal of applied physiology (Bethesda, Md. : 1985)
|January 19, 2026
概括
重复发作效应 (RBE) 表明,最初的异常运动 (EE) 发作可以防止随后的运动诱导肌肉损伤 (EIMD). 运动单元 (MU) 行为的神经适应有助于这种保护现象.
科学领域:
- 运动生理学 运动生理学
- 神经科学是一个神经科学.
- 肌肉生物学 肌肉生物学
背景情况:
- 奇特的运动 (EE) 诱导肌肉损伤,但随后的攻击引发了一种被称为重复攻击效应 (RBE) 的保护性反应.
- 在RBE的基础上的神经机制,特别是运动单元 (MU) 行为和视网脊髓 (RST) 驱动,仍然不完全理解.
研究的目的:
- 调查MU行为和RST驱动的变化是否是神经元件,有助于RBE中观察到的保护作用.
- 为了确定神经适应是否伴随着运动诱导的减弱肌肉损伤 (EIMD) 在第二次EE之后.
主要方法:
- 23名参与者进行了两次EE,分隔3周.
- 在运动后的各个时间点评估了最大自愿同度扭矩 (MVIC),肌肉疼痛,通过高密度电肌谱分解的MU行为,以及RST驱动.
主要成果:
- 虽然Bout 1导致了显著的EIMD (减少MVIC,增加疼痛),但Bout 2导致了尽管有可比的工作,但恢复速度更快.
- 发作2中减弱的EIMD症状与MU放电率和扭矩的变化减少有关.
- 在运动期间,没有观察到RST驱动力的显著变化.
结论:
- 动力单元 (MU) 的调整,包括降低放电率变化和减弱的火速增加,似乎是重复发作效应 (RBE) 的神经贡献者.
- 这些MU适应支持RBE的神经系统的作用,尽管它们是否积极保护免受损伤或反映减少干扰需要进一步调查.
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