温暖的环境降低了外源性葡萄糖氧化和耐力性能,在与面对空气流的骑行过程中
Kirsty M Reynolds1, Mark P Funnell, Adam J Collins
1National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UNITED KINGDOM.
Medicine and science in sports and exercise
|December 18, 2024
概括
在温暖的条件下骑自行车会损害葡萄糖的使用和性能. 即使有空气流,更高的温度也会减少外源葡萄糖氧化,并且由于温度调节和代谢应变,时间试验速度会减慢.
科学领域:
- 运动生理学 运动生理学
- 环境生理学环境生理学
- 运动科学 运动科学 运动科学
背景情况:
- 在耐力训练期间优化燃料利用对于性能至关重要.
- 环境热应激可以显著影响生理反应和运动能力.
研究的目的:
- 调查温暖与温带环境对外源性葡萄糖利用,自行车性能和胃肠道 (GI) 反应的影响.
- 评估面向空气流在减轻循环期间与热有关的损害方面的有效性.
主要方法:
- 十名训练有素的男性骑自行车者完成了2小时的自行车预装,随后在19°C (温度) 和32°C (温暖) 条件下进行了计时试验.
- 在预加载期间,参与者饮用了葡萄糖饮料 (72 g/h),在两种条件下,风扇提供了空气流.
- 测量包括外源性葡萄糖氧化率,计时试验性能,肠道温度,心率和感知劳动力.
主要成果:
- 与温带环境相比,在温暖的环境中,外源性葡萄糖氧化率显著降低 (14-15%),而在温带环境中则显著降低.
- 在温暖的条件下,计时试验的性能在温暖的条件下减慢了15%.
- 在热试验中,胃肠道温度,心率和感知劳动的评分都提高了,而胃肠道舒适度和肠脂肪酸结合蛋白水平保持不变.
结论:
- 温暖的环境条件会影响身体在长时间循环时利用摄入的葡萄糖的能力.
- 面对空气流并不能完全弥补热量对性能和燃料代谢的负面影响.
- 温度调节,心血管功能和新陈代谢过程的损伤可能会导致在高温下性能降低.
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