低碳水化合物摄入量与高碳水化合物摄入量在消耗糖原的炼后对高水平跑步者的随后1500米跑步表现的影响
Tomas Venckunas1, Petras Minderis1, Viktoras Silinskas1
1Institute of Sport Science and Innovations, Lithuanian Sports University, 44221 Kaunas, Lithuania.
在1500米计时赛前限制碳水化合物摄入会显著损害训练有素跑步者的表现. 低碳水化合物可用性降低了血液中的乳酸盐,但没有影响血糖或氧化应激标志物.
科学领域:
- 运动生理学 运动生理学
- 运动营养 运动营养
- 代谢适应的过程
背景情况:
- 碳水化合物 (CHO) 代谢对于高强度,短时间的运动至关重要.
- 有限的研究存在于糖原可用性对训练有素运动员在现场环境的影响.
- 了解运动前的糖原状况是优化运动表现的关键.
研究的目的:
- 调查操纵的赛前葡萄糖储量对1500米计时赛 (TT) 绩效的影响.
- 评估生理反应,包括脚步模式,心率,血液乳酸,葡萄糖和氧化应激,在不同的糖原条件下.
主要方法:
- 11名训练有素的中距离跑步者 (4名女性) 接受了消耗糖原的治疗.
- 参与者在1500米TT之前的两天内消耗了高 (>5g/kg/d) 或低 (<1.5g/kg/d) 的饮食CHO.
- 测量包括表现时间,步伐模式,心率,毛细血管血液乳酸,血糖和血麦隆迪甲基 (MDA).
主要成果:
- 与高CHO条件相比,在低CHO条件下1500mTT的表现明显减慢了约2% (4.5s) (p < 0.01).
- 在低CHO条件下观察到较低的基线和血中乳酸盐度的峰值 (p=0.022,p=0.039).
- 在两种条件之间,没有发现血糖或血MDA水平的显著差异.
结论:
- 限制运动前碳水化合物摄入量会损害训练有素跑步者的1500米计时比赛表现.
- 在高强度运动期间,糖原耗尽会降低基线和血中乳酸反应的峰值.
- 在这种情况下,短期CHO限制不会显著影响血糖和氧化应激标记 (MDA).
更多相关视频
08:32Quantification of Subcellular Glycogen Distribution in Skeletal Muscle Fibers using Transmission Electron Microscopy
Published on: February 7, 2022
08:01Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
Published on: May 16, 2021
相关概念视频
Muscle Recovery and Fatigue
Metabolic States of the Body: The Postabsorptive State
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
Overview of Carbohydrate Metabolism
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...
Introduction to Carbohydrates
Glucose Homeostasis: Regulation of Blood Glucose
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
Exercise and Muscle Performance
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
