短期「高住低訓」後經單次運動訓練結束補充碳水化合物對人體骨骼肌能量代謝的影響

Effects of Short Term “Living High Training Low “After Postexercise Carbohydrate Supplementation on Human Skeletal Muscle Energy Metabolism

張聖良(Sheng-liang Chang)

指導教授 ： 林一郎

中臺科技大學/健康科學院/食品科技研究所/碩士(2011年)

摘要

運動員經由低氧環境刺激身體血液輸氧能力，提升選手耐力運動表現。然而運動員常氧環境運動訓練後，低氧環境休息是否能更有效地增加肌肉葡萄糖利用能力。本研究目的探討短期常氧訓練、低氧休息(hypoxia training, HT)七天後，單次運動挑戰後補充碳水化合物是否可以增加肌肉肝醣合成。八名健康男性受測者完成兩次實驗流程，常氧環境進行60分鐘70％VO2 max強度運動共七天，並於每天運動後於常氧(Control試驗)或低氧環境(HT試驗)七天休息，第八天進行單次運動挑戰後補充高碳水化合物飲食；實驗採交叉設計，兩次試驗相隔21天。運動恢復期0小時及4小時進行肌肉採樣，運動後0至4小時間，每隔30分鐘接受血液採樣。結果顯示單次運動挑戰，HT試驗在運動後4小時肌肉肝醣顯著增加（P < .05），且葡萄糖利用率也顯著上升
（P < .05），GLUT4 mRNA則有提早向下調節趨勢。這次試驗顯示HT試驗能夠有效增加運動恢復期肌肉肝醣的再合成。

關鍵字

低氧 ； 胰島素 ； 肝醣

並列摘要

Muscle glycogen is the importance energy source during high intensity exercise. Little study was found regarding to whether short-term normoxic exercise training and recovery in hypoxia condition will enhance glycogen synthesis in exercised human skeletal muscle. At the 8th morning, after seven days crossover exercise training programs, eight healthy male subjects (aged 20.29 ± 0.42 years) completed a 60-min cycling exercise at 70% –75VO2 peak, They consumed a high carbohydrate meal (2 g carbohydrate/ kg body weight, 80 % carbohydrate, 8 % fat, 12 % protein) for a 3-hour recovery following exercise. Biopsied muscle samples were obtained from vastus lateralis immediately and 4 h after exercise. We found short-term normonic exercise training and hypoxic recovery trial significantly lowered post-meal glucose response with similar insulin curve compared to those of normonic exercise training and normonic recovery trial. The rate of glycogen synthesis in hypoxic recovery trial was significantly higher than those in nomonic recovery trial (P < .05). The current study demonstrated the new evidences that short term normoxia exercise training and recovery in hypoxia condition enhances glycogen synthesis in exercised human skeletal muscle.

並列關鍵字

hypoxica ； insulin ； glycogen

參考文獻

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