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肌肉收缩功能的被动加热诱导的变化不会被长时间暴露在经历中度热应激的年轻男性中进一步增加
Viktorija Treigyte1, Thomas Chaillou2, Nerijus Eimantas1
1Sports Science and Innovation Institute, Lithuanian Sports University, Kaunas, Lithuania.
Frontiers in physiology
|March 13, 2024
概括
通过热水浸泡 (HWI) 的被动加热会改变肌肉收缩功能,增加速度和放松,但不会增加最大扭矩. 长时间的HWI并没有进一步增强这些效应,这表明中度的热应力不会加剧疲劳.
科学领域:
- 生理学 生理学 生理学
- 运动科学 运动科学
- 热调节 热调节 热调节
背景情况:
- 研究通过热水浸泡 (HWI) 的被动加热 (PH) 对肌肉功能的影响.
- 检查单次和间歇/延长的HWI持续时间的肌肉收缩性质.
- 评估PH对未疲劳和疲劳状态的肌肉功能的影响.
研究的目的:
- 确定一次性和长时间通过HWI被动加热如何影响肌肉收缩功能.
- 评估被动加热时间对肌肉性能和疲劳发展的影响.
- 在不同的加热条件下分析肌肉收缩特性和自愿激活的变化.
主要方法:
- 十二名年轻男性接受了单个 (45分钟) 和间歇/延长 (45分钟初始+8x15分钟) 阶段的控制 (CON) 和HWI (44-45°C) 条件.
- 监测肌肉 (Tmu) 和直肠 (Trec) 温度;在多个时间点进行神经肌肉测试 (膝盖伸缩器/曲器).
- 测试后应用了疲劳方案 (100次电刺激),以评估疲劳的发展.
主要成果:
- HWI将Tmu和Trec提高到38-38.5°C,而不会影响最大扭矩,但会增加肌肉收缩速度和放松.
- 在HWI后观察到P20/P100比率的降低和肌肉放松的改善.
- 虽然自发激活略有下降,但HWI后疲劳的发展比CON更大,而加热时间没有显著的影响.
结论:
- 通过HWI被动加热改变了肌肉收缩功能,增强了速度和放松,而不会损害最大力生产.
- 长时间的被动加热不会加剧这些功能变化,也不会在中度热应激下增加疲劳.
- 这些发现表明,适度的被动加热可以改变肌肉动力学,但不一定会导致更大的疲劳易受性随着长时间的暴露.
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