운동심리학 : 상온 및 저온 환경의 지속적 운동시 BCAA 추가섭취에 따른 생리적 반응의 비교 = Comparison of BCAA supplementation on the physiological responses during submaximal prolonged exercise between thermoneutral and low temperature

다국어 초록 (Multilingual Abstract)

The purpose of this study was to investigate the possibilities of improving endurance exercise capacity in low temperature through the supplementation of branched-chain amino acid(BCAA) by analyzing the effect of BCAA supplementation on physiological responses during submaximal prolonged exercise between thermoneutral and low temperature. Six male high school long-distance runners participated in the experiment as subjects and were exposed to thermoneytral(22±1℃) and low temperature (5±1℃) conditions with relative humidity of 60±5% for 60 min. Each subject performed 90 min, endurance exercise on the fixed cycle ergometer at 60%VO₂max in two treatment conditions, with the supplementation placebo and BCAA. In the BCAA condition, the subject was supplemented with 200㎖ of BCAA solution prepared by dissolving 200㎎/㎏ 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, physiological variables relation to endurance capacity were measured. Although rectal temperature was high in the thermoneutral condition than the low temperature, the differed between BCAA and placebo conditions was not significant. In terms of test session, it decreased after the BCAA supplementation but increased with the exercise. It remained higher than prior to BCAA supplementation at 30 min. after the end of exercise. Heart rate was higher in the thermoneutral condition than the low temperature, but the difference between BCAA and placebo conditions was not significant. It increased with exercise in both temperature conditions, and in the thermoneutral condition it remained higher than prior to BCAA supplementation at 30 min. after the end of exercise. Blood lactate concentration was not affected by treatment. In the thermoneutral condition it increased from the exercise onset for 30 min, and decreased from 90 min. exercise. In the low temperature, however, it increased at 30 min exercise compared to that prior to supplementation and remained in the steady state after that period. While plasma ammonia concentration was not different between temperature conditions, it was higher in the BCAA condition than placebo. In the BCAA condition, it increased during the exercise. In the placebo condition, however, it increased during the exercise but decreased to the level at 30 min exercise at 30 min. after the end of exercise. Taken together, although the environmental temperature affect to the endurance capacity during submaximal prolonged exercise, BCAA supplementation during prolonged exercise in low temperature does not seem to have the possibility of improving endurance exercise capacity and metabolism