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題 名 | 運動後不同升糖指數碳水化合物補充對人體骨骼肌葡萄糖轉運子影響=The Effects of Different Gls Carbohydrate Supplementations on GLUT4 Protein Expression in Post-Exercise Human Skeletal Muscle |
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作 者 | 程一雄; 廖淑芬; 巫錦霖; 李寧遠; | 書刊名 | 大專體育學刊 |
卷 期 | 9:1 2007.03[民96.03] |
頁 次 | 頁115-126 |
分類號 | 528.9012 |
關鍵詞 | 肌肉穿刺; 西方點墨法; Muscle biopsy; Western blotting; |
語 文 | 中文(Chinese) |
中文摘要 | 葡萄糖轉運子4號(glucose transporter 4, GLUT4)為人體骨骼肌肉葡萄糖利用重要因子之一,文獻顯示老鼠及人體骨骼肌肉GLUT4 mRNA及蛋白質表現量受到運動或碳水化合物補充影響。這次實驗目的想要了解單一運動後立即補充不同升糖指數(glycemic index, GI)碳水化合物對骨骼肌肉GLUT4蛋白質表現的影響。24名受試者(年齡21.30±1.46歲,身高173.10 ± 5.33公分,體重70.21 ± 7.34公斤,相對攝氧量峰值43.65±10.58毫升/公斤/分鐘),單一次75%最大攝氧量峰值腳踏車運動60分鐘後,隨機分成3組,分別給予禁食、高GI碳水化合物及低GI碳水化合物三種不同試驗處理(禁食組、高GI組、低GI組)。運動剛結束及運動後3小時各進行一次肌肉穿刺取得肌肉樣本,以西方墨點法(Western Blotting)定量葡萄糖轉運子蛋白質表現,運動剛結束至3小時內,每30分鐘收集血液樣本後,測定血液葡萄糖及胰島素的濃度。結果顯示高GI碳水化合物補充組胰島素曲線下面積(insulin area under curve, IAUC)大於低GI碳水化合物補充組(p<.05),運動後3小時高GI組GLUT4蛋白質表現顯著高於低GI組及禁食組(p<.05)。這次研究結果主要發現,運動後恢復期補充高GI碳水化合物飲食能增加胰島素的分泌,並促進GLUT4蛋白質表現。 |
英文摘要 | Glucose transporter subtype 4 (GLUT4) is an important factor for glucose uptake in human skeletal muscle. The mRNA and protein level of GLUT4 can be regulated with exercise or carbohydrate supplementation in rat and human skeletal muscles. This study investigated the effect of different glycemic index (GI) carbohydrate supplementations after a bout of exercise on GLUT4 protein expression in human skeletal muscle. Twenty-four subjects (age 21.30±1.46 yrs, height 173.10±5.33cm, weight 70.21±7.34 kg, VO2 peak 43.65±10.58ml/kg/min) were asked to take a single bout of cycle ergometer at 75% peak oxygen consumption for 60 minutes. The subjects were randomly assigned to one of the three treatment groups after exercise: fasting, high GI carbohydrate (HGI) supplement or low GI carbohydrate (LGI) supplement. Biopsies were performed on the deep portion of the vastus lateralis muscle of all the subjects immediately after exercise and 3 hours after the carbohydrate ingestion. The protein expressions of GLUT4 were shown quantitatively with the Western Blotting technique. The blood samples were collected immediately after the exercise and every 30 minutes thereafter, up to 3 hours. The blood samples were collected for glucose and insulin analyses. Insulin AUC was significantly higher in the HGI group than in the LGI group (p<.05). The GLUT4 protein content in the HGI group significantly increased above the LGI group and the fasting trail (p<.05). The results of this study found that the HGI carbohydrate supplement after exercise can enhance GLUT4 protein expression and increase insulin secretion during the recovery period. |
本系統中英文摘要資訊取自各篇刊載內容。