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Exercise Science 2002;11(2): 301-313. |
| 저온환경에서의 지속적 운동시 BCAA 추가섭취가 혈중 대사변인의 변화에 미치는 영향 |
| 김홍수1, 김기진2 |
1계명문화대학
2계명대학교 |
| The effects of BCAA supplementation on the blood metabolic variables during submaximal prolonged exercise in low temperature |
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| ABSTRACT |
Kim, H.S., Kim, K.J. The effects of BCAA supplementation on the blood metabolic variables during submaximal prolonged exercise in low temperature. Exercise Science, 11(2): 301-314, 2002. The purpose of this study was to investigate the possibilities of improving endurance capacity in low temperature through the supplementation of branched-chain amino acid(BCAA) by analyzing the effect of BCAA supplementation on blood hormones and metabolic responses during submaximal prolonged exercise in low temperature.
Six male high school long-distance runners participated in the experiment as subjects and were exposed to thermoneutral(22±1℃) and low temperature (5±1℃) conditions with relative humidity of 60±5% for 90 min. Each subject performed 90 min. endurance exercise on the fixed cycle ergometer at 60%O2max in two treatment conditions, as placebo and BCAA. In the BCAA condition, the subject was supplemented with 200㎖ of BCAA(L-leucine; 45%, L-isoleucine; 30%, L-valine; 25%) solution prepared by dissolving 200㎎/kg in weight of BCAA in 400㎖ of pure water at both 45 min. and 15 min. prior to exercise. In the placebo condition, placebo(water) was used instead of BCAA in preparing the oral supplement. During the experiment, blood hormones and blood metabolites were measured. The variables were analyzed by 3-way ANOVAs(2 temperatures x 2 treatments x 6 test sessions) with repeated measures.
Results
of the experiment were as the following:Plasma epinephrine concentration tend to be higher in the low temperature condition than the thermoneutral temperature, although the difference was not statistically significant. It increased with exercise compared to that prior to BCAA supplementation.
Plasma norepinephrine concentration was higher in the low temperature condition than the thermoneutral temperature. In the thermoneutral temperature, it increased at 30 min. exercise and 60 min. exercise with BCAA supplementation, and throughout exercise with placebo. In the low temperature, it increased at 30 min. exercise with BCAA supplementation. With placebo, however, it increased right after the supplementation but decreased after that test session.
Plasma glucagon concentration was not affected by either temperature, treatment or test session. Serum insulin concentration tend to be higher in the thermoneutral condition than the low temperature, although the difference was not statistically significant. It decreased right after exercise compared to that prior to BCAA supplementation.
Serum cortisol concentration was not different between BCAA and placebo conditions. In the thermoneutral condition, it increased at 90 min. exercise and then remained in the steady state for 30 min. after the exercise. In the low temperature, it increased at 90 min. exercise.
Serum free fatty acid concentration was not affected by either temperature or treatment. It increased both at 90 min. exercise and 30 min. after the end of exercise compared to that prior to supplementation.
Serum glucose concentration was higher in the thermoneutral condition than the low temperature, and in the placebo condition than the BCAA. While in the thermoneutral condition, it decreased after BCAA supplementation and 30 min. after the end of exercise to the level measured at right after BCAA supplementation, it decreased during the exercise and at 30 min. after the end of exercise compared to that prior to BCAA supplementation in the low temperature.
Taken together, although the environmental temperature seems to affect endurance exercise capacity during submaximal prolonged exercise in low temperature, it's effect on blood hormone and blood metabolic response is not clear. In addition, BCAA supplementation during prolonged exercise in low temperature does not seem to have the possibility of improving endurance exercise capacity and metabolism. |
| Key words:
BCAA, 저온, 카테콜라민, 글루코스 |
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