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題名 | 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 |
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作者 | 林依婷; 林勁帆; 黃萾芬; 葉姿劭; 許美智; 劉珍芳; | 書刊名 | 臺灣營養學會雜誌 |
卷期 | 34:4 2009.12[民98.12] |
頁次 | 頁114-122 |
分類號 | 993.194 |
關鍵詞 | 昇糖指數; 血糖值; 運動表現; Glycemic index; Glucose; Exercise performance; |
語文 | 中文(Chinese) |
中文摘要 | 本研究目的在探討於運動前給予不同昇糖指數 (glycemic index,GI) 的飲食對耐力運動表現及血液生化值的影響。12位健康受試者,隨機給予高昇糖指數飲食 (74.0HGI)、低昇糖指數飲食 (25.4,LGI) 或水(控制組),一小時後以65% VO2max之運動強度跑至力竭。分別於攝食前、攝食後15、30、45、60及力竭點進行採血,並於運動前、運動中10分鐘、運動中20分鐘與力竭時採氣並紀錄心跳,以測量運動表現與運動後血液生化值及呼吸代謝交換率的影響。結果顯示,在運動前LGI與HGI組之呼吸交換率顯著高於控制組 (p<0.05),運動中20分鐘HGI組顯著高於控制組 (p<0.05)。食用HGI與LGI飲食後,血糖較控制組顯著上升 (p<0.05),且HGI組上升幅度又顯著高於LGI組;然而HGI組與LGI組游離脂肪酸均顯著低於控制組 (p<005)。由以上結果可得以下結論,運動前的過高呼吸交換率可當成運動時的能量依賴的參考值,且有氧運動前一小時選擇LGI飲食,將有助醣類於運動時能量之利用,但需避免食用HGI飲食,因其可能引起高胰島素現象,對運動表現會有不利的影響。 |
英文摘要 | 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. |
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