運動前攝取不同昇糖指數之飲食對耐力運動時呼吸及血液能量利用之影響

Effects of Meals with a Different Glycemic Index on Respiratory and Biochemical Outcomes during Endurance Exercise

林依婷(Yi-Ting Lin) ； 林勁帆(Chin-Fan Lin) ； 黃萾芬(Ying-Fen Huang) ； 葉姿劭(Tzu-Shao Yeh) ； 許美智(Mei-Chich Hsu) ； 劉珍芳(Jen-Fang Liu)

《臺灣營養學會雜誌》 34卷4期 (2009/12) Pp. 114-122

https://doi.org/10.6691/NSJ.200912_34(4).0001

摘要

BSTRACT The purpose of this study was to compare the effects of a pie-exercise meal containing a different glycemic index on the endurance exercise performance and biochemical outcomes. Twelve healthy volunteers consumed a high glycemic index meal (74, HGI) a low glycemic index meal (32.8, LGI) (each meal provided 1 g carbohydrate/kg body weight), or water (as the control) 1 h before running at 65% VO2max to exhaustion. After ingesting the meal, blood samples of subjects were drawn from a vein at the baseline, at 15, 30, 45, and 60 min, and at exhaustion. The heart rate, rating perceived exercise RPE), and respiratory metabolism exchange ratio (RER) were recorded during the exercise. As the data showed, RER values of the LGI and HGI groups were higher than the control before exercise (p＜0.05). There were no significant differences among the three groups for heart rate, RPE, and time to exhaustion. Ingestion of the HGI and LGI meals resulted in hyperglycemia during the postprandial period compared to the control (p＜0.05). The concentration of plasma free fatty acids (FFAs) in the HGI and LGI groups were significantly lower than in the control (p＜0.05). The concentration of FFAS in the LGI group was significantly lower than that in the HGI group. In conclusion, this study demonstrated that an LGI meal might have a positive effect on aerobic endurance through contributing energy by providing carbohydrates as fuel. However, with an HGL meal, one might observe the phenomena of delayed production of factors which cause fatigue, and enhanced endurance exercise performance may be seen with ingestion of an LGI meal before exercise.

關鍵字

昇糖指數 ； 血糖值 ； 運動表現

並列摘要

BSTRACT The purpose of this study was to compare the effects of a pie-exercise meal containing a different glycemic index on the endurance exercise performance and biochemical outcomes. Twelve healthy volunteers consumed a high glycemic index meal (74, HGI) a low glycemic index meal (32.8, LGI) (each meal provided 1 g carbohydrate/kg body weight), or water (as the control) 1 h before running at 65% VO2max to exhaustion. After ingesting the meal, blood samples of subjects were drawn from a vein at the baseline, at 15, 30, 45, and 60 min, and at exhaustion. The heart rate, rating perceived exercise RPE), and respiratory metabolism exchange ratio (RER) were recorded during the exercise. As the data showed, RER values of the LGI and HGI groups were higher than the control before exercise (p＜0.05). There were no significant differences among the three groups for heart rate, RPE, and time to exhaustion. Ingestion of the HGI and LGI meals resulted in hyperglycemia during the postprandial period compared to the control (p＜0.05). The concentration of plasma free fatty acids (FFAs) in the HGI and LGI groups were significantly lower than in the control (p＜0.05). The concentration of FFAS in the LGI group was significantly lower than that in the HGI group. In conclusion, this study demonstrated that an LGI meal might have a positive effect on aerobic endurance through contributing energy by providing carbohydrates as fuel. However, with an HGL meal, one might observe the phenomena of delayed production of factors which cause fatigue, and enhanced endurance exercise performance may be seen with ingestion of an LGI meal before exercise.

並列關鍵字

glycemic index ； glucose ； exercise performance