- 期刊
- OpenAccess
支鏈胺基酸補充與運動對生長激素與可體松分泌之影響
Effect of Branched-Chain Amino Acid Supplementation on Human Growth Hormone and Cortisol Secretion after Exercise
摘要
The effect of branched-chain amino acid (BCAA) supplementation on human growth hormone (HGH) and cortisol secretion induced by 25 mm of breast stroke exercise (65-70% maximum heart rate reserved, 65-70% HRRmax) and a 600 m crawl stroke competition was investigated in a double-blind, counter-balanced study. Nineteen (19-22 years old＞ male university students with physical education majors were recruited as subjects. Based on the swimming score of a 600 m crawl stroke, the students were divided into two groups: placebo (n=9, BMI=24.2± 2.1 kg/m^(2) 12 g of glucose/day; in capsules) and BCAA (n=10, BMI=22.7±1.5 kg/m^(2) 12 g of BCANday; in capsules: leucine 54%, isoleucine 19%, valine 27%) groups. The participants maintained a regular dietary intake and exercise activity at a moderate/low intensity (60-70% HRRmax, swimming and rowing, ~1.5 hour/day) during the two week study. Plasma glucose and serum HGH concentrations were not affected by the 14 days of dietary supplementation in either group, but serum cortisol concentration decreased significantly (p ＜ .05) regardless of the dietary treatment. On day 15, after 25 mm of breast stroke exercise and a 600 m crawl stroke competition, plasma glucose concentrations significantly decreased (p ＜ .05) whereas serum HGH and cortisol concentrations increased significantly (p ＜ .05) in both groups. Before exercise, the concentrations of the two hormones in the BCAA group were significantly higher than those for the placebo group, respectively (p ＜ .05). After either form of exercise, HGH secretion for the BCAA group was significantly enhanced (p ＜ .05). In conclusion, both exercise and BCAA supplements significantly affected serum HGH concentration. The cumulative effects of exercise and BCAA supplements would be manifested in an increased concentration of serum HGH. We, therefore, conclude that, in the case of BCAA supplementation, moderate/low intensity exercise induces high levels of HGH and cortisol secretion. The effect of HGH on body composition, however, requires further investigation.
並列摘要
The effect of branched-chain amino acid (BCAA) supplementation on human growth hormone (HGH) and cortisol secretion induced by 25 mm of breast stroke exercise (65-70% maximum heart rate reserved, 65-70% HRRmax) and a 600 m crawl stroke competition was investigated in a double-blind, counter-balanced study. Nineteen (19-22 years old＞ male university students with physical education majors were recruited as subjects. Based on the swimming score of a 600 m crawl stroke, the students were divided into two groups: placebo (n=9, BMI=24.2± 2.1 kg/m^(2) 12 g of glucose/day; in capsules) and BCAA (n=10, BMI=22.7±1.5 kg/m^(2) 12 g of BCANday; in capsules: leucine 54%, isoleucine 19%, valine 27%) groups. The participants maintained a regular dietary intake and exercise activity at a moderate/low intensity (60-70% HRRmax, swimming and rowing, ~1.5 hour/day) during the two week study. Plasma glucose and serum HGH concentrations were not affected by the 14 days of dietary supplementation in either group, but serum cortisol concentration decreased significantly (p ＜ .05) regardless of the dietary treatment. On day 15, after 25 mm of breast stroke exercise and a 600 m crawl stroke competition, plasma glucose concentrations significantly decreased (p ＜ .05) whereas serum HGH and cortisol concentrations increased significantly (p ＜ .05) in both groups. Before exercise, the concentrations of the two hormones in the BCAA group were significantly higher than those for the placebo group, respectively (p ＜ .05). After either form of exercise, HGH secretion for the BCAA group was significantly enhanced (p ＜ .05). In conclusion, both exercise and BCAA supplements significantly affected serum HGH concentration. The cumulative effects of exercise and BCAA supplements would be manifested in an increased concentration of serum HGH. We, therefore, conclude that, in the case of BCAA supplementation, moderate/low intensity exercise induces high levels of HGH and cortisol secretion. The effect of HGH on body composition, however, requires further investigation.