乳酸度的变化伴随着脂肪氧化模式的相反变化:剂量反应关系
José Antonio Benítez-Muñoz1, Isabel Guisado-Cuadrado1, Miguel Ángel Rojo-Tirado1
1LFE Research Group, Department of Health and Human Performance, Faculty of Physical Activity and Sport Science (INEF), Universidad Politécnica de Madrid, Madrid, Spain.
European journal of sport science
|October 30, 2024
概括
乳酸盐水平反向影响运动期间的脂肪氧化. 低乳酸,在糖原耗尽期间看到,与更高的脂肪燃烧相关,而更高的乳酸,特别是在热,减少脂肪氧化.
科学领域:
- 运动生理学 运动生理学
- 代谢调节 代谢调节 代谢调节
- 生物化学 生物化学
背景情况:
- 在不同的生理条件下,运动期间乳酸盐度和脂肪氧化之间的关系尚不清楚.
- 了解这种联系可以揭示乳酸和脂肪代谢之间的剂量反应关系.
- 之前的研究还没有充分探索糖原耗尽和热应激等因素如何影响这种相互作用.
研究的目的:
- 调查因糖原耗尽或热应激引起的乳酸盐度变化是否会在增加的运动过程中影响脂肪氧化.
- 在不同的实验条件下,确定血液中乳酸盐水平与脂肪氧化率之间是否存在直接相关性.
主要方法:
- 19名参与者 (11名男性,8名女性) 完成了增量运动测试.
- 测试了三个条件:控制,糖原耗尽和暴露于热量.
- 血中乳酸度和脂肪氧化率 (通过间接热量计) 被测量在休息状态,运动阶段和疲劳后.
主要成果:
- 在所有条件下,在乳酸度和脂肪氧化之间观察到强烈的反向关联 (r > 0.88,p < 0.05).
- 热应激导致乳酸水平最高,脂肪氧化水平最低,而糖原耗尽则呈现相反的趋势.
- 在特定运动强度的男性或女性中,乳酸和脂肪氧化情况变化之间没有发现显著的关联.
结论:
- 乳酸积累与运动期间的脂肪氧化有着强烈且反向的联系,不管情况如何.
- 糖原耗尽有利于在较低的乳酸盐水平下更高的脂肪氧化,而热应激导致高乳酸盐抑制脂肪氧化.
- 这些发现突出了生理状态对身体活动期间乳酸和基质利用之间的相互作用的重大影响.
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