晨間空腹對力竭性運動生理負荷及能量受質代謝之影響

The Effects of Overnight Fasting on Exhausted Exercise Performance, Physiological and Metabolic Responses

陳國生(Kuo-Sheng Chen) ； 方進隆(Chin-Lung Fung)

《運動教練科學》 20期 (2010/12) Pp. 33-45

https://doi.org/10.6194/SCS.2010.20.04

摘要

Purpose: To investigate the effects of overnight fasting on exhausted exercise performance, physiological and metabolic response. Method: Healthy male subjects (n=12; age 20.2±1.1 yrs; height 175.5±6.5 cm; weight 70.8±6.2 kg; V•O(subscript 2max) 52.9±6.8 ml/kg/min) performed a treadmill exercise at 45%V•O(subscript 2max) for 15 minutes followed by 80%V•O(subscript 2max) to exhaustion under both fed and overnight-fasted states by counterbalanced design. Heart rate, oxygen uptake, respiratory exchange ratio and rate of perceived exertion were measured during exercise. The circulating glucose and free fatty acid levels were measured at resting state before exercise and 5(superscript th) and 10(superscript th) minutes during recovery after exercise while circulating lactate level was only measured during recovery. Paired t-test was performed to determine the fasting effect. Result: In the physical stress, there were no significant differences in heart rate, oxygen uptake, the rate of perceived exertion, the time to exhaustion of the high-intensity running between dieted and fasted state. In the metabolic substrate, there were no differences on the concentration of blood glucose, the lactate concentration at 5(superscript th) and 10(superscript th) minute in the recovery period, respiratory exchange ratio between dieted and fasted state was observed in fasted state than in fed state (p＜.05). Conclusion: Exercise after overnight fasting had an increased fatty acid mobilization without compromising performance, physiological and metabolic responses.

關鍵字

脂肪動員 ； 乳酸

並列摘要

Purpose: To investigate the effects of overnight fasting on exhausted exercise performance, physiological and metabolic response. Method: Healthy male subjects (n=12; age 20.2±1.1 yrs; height 175.5±6.5 cm; weight 70.8±6.2 kg; V•O(subscript 2max) 52.9±6.8 ml/kg/min) performed a treadmill exercise at 45%V•O(subscript 2max) for 15 minutes followed by 80%V•O(subscript 2max) to exhaustion under both fed and overnight-fasted states by counterbalanced design. Heart rate, oxygen uptake, respiratory exchange ratio and rate of perceived exertion were measured during exercise. The circulating glucose and free fatty acid levels were measured at resting state before exercise and 5(superscript th) and 10(superscript th) minutes during recovery after exercise while circulating lactate level was only measured during recovery. Paired t-test was performed to determine the fasting effect. Result: In the physical stress, there were no significant differences in heart rate, oxygen uptake, the rate of perceived exertion, the time to exhaustion of the high-intensity running between dieted and fasted state. In the metabolic substrate, there were no differences on the concentration of blood glucose, the lactate concentration at 5(superscript th) and 10(superscript th) minute in the recovery period, respiratory exchange ratio between dieted and fasted state was observed in fasted state than in fed state (p＜.05). Conclusion: Exercise after overnight fasting had an increased fatty acid mobilization without compromising performance, physiological and metabolic responses.

並列關鍵字

fat mobilization ； lactic acid

參考文獻

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