碳水化合物补充剂在短期能量缺陷期间保持体力表现,尽管外源性葡萄糖氧化减少
Lee M Margolis1, Jillian T Allen1, Nancy E Murphy1
1Military Nutrition Division, U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts, United States.
短期能量赤字减少了运动期间外源性葡萄糖氧化. 然而,身体表现仍然相似,表明健康个体的代谢弹性.
科学领域:
- 运动生理学 运动生理学
- 营养科学 营养科学
- 代谢研究研究 代谢研究
背景情况:
- 完全的饥饿显著减少了运动期间外源性葡萄糖氧化.
- 更常见的能量赤字对葡萄糖代谢和运动表现的影响还不清楚.
- 运动员和军人经常经历不同程度的能量缺陷.
研究的目的:
- 评估不同程度的能量缺陷 (20%,40%,60%) 对运动期间外源性葡萄糖氧化的影响.
- 为了确定这些能源赤字对物理性能的影响.
- 将这些影响与能量平衡状态进行比较.
主要方法:
- 随机,纵向并行研究,涉及4天的能量平衡阶段,其次是6天的能量赤字阶段.
- 参与者经历了90分钟的循环人体工程学在56%V·o2峰与摄入葡萄糖,其次是疲劳测试的时间.
- 测量了基质氧化,肌肉糖原和与葡萄糖代谢相关的基因表达.
主要成果:
- 与能量平衡相比,肌肉糖原水平在能量赤字期间较低,无论赤字的严重程度如何.
- 在能量赤字期间,葡萄糖摄取和糖原分解的基因表达减少.
- 在能量不足期间,外源性葡萄糖氧化率大约降低了10%,但耗尽的时间没有显著差异.
结论:
- 短期的能量赤字会降低运动期间外源性葡萄糖氧化能力.
- 尽管降低了葡萄糖氧化,但身体表现仍然保持不变,这表明代谢弹性.
- 短期能量缺陷的严重程度 (20-60%) 并没有对代谢反应或身体表现产生差异性影响.
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