Glycemic and Insulinemic Responses and Muscle Homeostasis Following High-intensity Running after Pre-exercise Carbohydrate Feeding

高醣飲食對高強度運動後之昇糖及胰島素反應和肌肉恆定之影響

湯馥君(Fu-Chun Tang) ； 李志文(Chih-Wen Lee)

《中華民國營養學會雜誌》 27卷2期 (2002/06) Pp. 67-76

https://doi.org/10.6691/JCNS.200206_27(2).0002

摘要

This study investigated the effect of high carbohydrate (CHO) consumption prior to exercise on plasma glucose and insulin responses, and muscle homeostasis after exhaustive exercise, Nineteen male college athletes completed two exhaustive exercises: a regular trial (regular diet; to determine maximal oxygen consumption [VO2max]) and a formula trial (high CHO [~84%] formula diet, ~ 13 kcal/kg BW; 85% VO2max, 10% grade). The diet was given 60 min prior to exercise and was ingested within 30 min. Blood samples were taken before, during, and after exercise. Urinary samples were collected pre- and post-exercise. After consumption of the CHO formula diet, both plasma glucose and insulin concentrations increased significantly (p ＜ 0.0001). During exercise, both concentrations decreased significantly (p ＜ 0.0001), and then after completing the exercise, they gradually increased to the end of the experiment. However, after 24 h, plasma glucose concentration had decreased again and reached the lowest level (p ＜ 0.0001). During the exhaustive period, lactate concentration significantly increased (p ＜ 0.0001), and then after exhaustion, it significantly decreased (p ＜ 0.01) to return to its baseline. After exhaustion, there was a significant decrease (p ＜ 0.05) in urinary urea nitrogen excretion and a significant increase (p ＜ 0.05) in urinary hydroxyproline and 3-methylhistidine excretions, In conclusion, pre-exercise CHO(84%) feeding does not induce transient exercise hypoglycemia during the initial ~20 min of exercise. Muscle homeostasis, however, is affected by the high-intensity exercise of 85% VO2max even if the energy provided is sufficient.

關鍵字

醣類 ； 運動 ； 葡萄糖 ； 胰島素 ； 羥基脯胺酸 ； 3-甲基組胺酸

並列摘要

This study investigated the effect of high carbohydrate (CHO) consumption prior to exercise on plasma glucose and insulin responses, and muscle homeostasis after exhaustive exercise, Nineteen male college athletes completed two exhaustive exercises: a regular trial (regular diet; to determine maximal oxygen consumption [VO2max]) and a formula trial (high CHO [~84%] formula diet, ~ 13 kcal/kg BW; 85% VO2max, 10% grade). The diet was given 60 min prior to exercise and was ingested within 30 min. Blood samples were taken before, during, and after exercise. Urinary samples were collected pre- and post-exercise. After consumption of the CHO formula diet, both plasma glucose and insulin concentrations increased significantly (p ＜ 0.0001). During exercise, both concentrations decreased significantly (p ＜ 0.0001), and then after completing the exercise, they gradually increased to the end of the experiment. However, after 24 h, plasma glucose concentration had decreased again and reached the lowest level (p ＜ 0.0001). During the exhaustive period, lactate concentration significantly increased (p ＜ 0.0001), and then after exhaustion, it significantly decreased (p ＜ 0.01) to return to its baseline. After exhaustion, there was a significant decrease (p ＜ 0.05) in urinary urea nitrogen excretion and a significant increase (p ＜ 0.05) in urinary hydroxyproline and 3-methylhistidine excretions, In conclusion, pre-exercise CHO(84%) feeding does not induce transient exercise hypoglycemia during the initial ~20 min of exercise. Muscle homeostasis, however, is affected by the high-intensity exercise of 85% VO2max even if the energy provided is sufficient.

並列關鍵字

carbohydrate ； exercise ； glucose ； insulin ； hydroxyproline ； 3-methylhistidine