고온환경에서의 운동중 세로토닌 운반체(5-HTT) 유전자 다형성에 따른 중추피로 관련 변인 비교
Comparisons of central fatigue by gene polymorphism of 5-HTT under hot environment
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초록
본 연구의 목적은 고온환경에서의 유산소성 탈진 운동 후 5-HTT유전자 다형성에 따라 중추피로의 원인으로 여겨지는 심부온도 및 신경전달물질들의 변화를 관찰함으로써 5-HTT 유전자 다형성에 따른 고온환경에서의 중추피로 유발과 관련된 변인들의 차이를 알아보는데 있었다. 1차적으로 307명을 대상으로 5-HTT 유전자 다형성을 분석하였으며, 그 중 SS형과 LS형(이상 S형) 8명과 LL형(이상 L형) 8명 등 총 16명을 선정하였다. 모든 대상자들은 35℃ 습도 50% 환경에서 30분동안 VT 운동강도의 달리기를 실시한 후, 점증부하방식의 최대 유산소 달리기 운동을 실시하였으며 5-HTT 유전자 다형성별로 시기간 신경전달물질 및 중추피로를 비교한 결과는 다음과 같다. 첫째, 고온환경에서의 최대운동 직후 VO2는 S형이 L형보다 유의하게 높았지만(p<.05) 운동소요시간, 젖산, 심박수에서는 차이가 없었다(p>.05). 둘째, L형은 회복기에서 최대운동 직후보다 증가했으며, S형은 감소했지만 유의한 차이는 없었다(p>.05). 셋째, 두 다형성 모두 최대운동직후 가장 높은 도파민 변화를 보였지만 5-HTT 다형성에 따른 차이는 없었다(p>.05). 넷째, 프로락틴은 두 다형성 모두 최대운동직후 가장 높았지만 5-HTT 유전자 다형성에 따라 차이는 없었다(p>.05), 다섯째, 다형성에 따라 직장온, 암모니아, pH, 젖산, 피로자각 수준은 차이가 없었지만(p>.05), 회복기 피로자각 회복속도에서 다형성간 다른 경향을 보였다. 여섯째, 프로락틴, pH는 L형의 피로자각 수준을 예측하는데 유의한 설명변인이며(p<.05), 도파민은 S형의 피로자각수준에 대한 유의한 설명변인으로 나타났다(p<.05). 이상의 결과들을 요약하면 고온환경에서의 60분가량의 운동 후 신경전달물질에 의한 중추피로 유발 관련 변인들은 5-HTT 유전자 다형성에 따라 차이가 없는 것으로 나타났다.
Abstract
The purpose of this study was to investigate the difference of central fatigue by 5-HTT gene polymorphism during exhausted exercise under hot environment. Polymorphisms in the 5-HTT were determined in genormic DNA obtained from 307 college aged men. 16 out of 368 were participated into this study and divided into two groups according to their genotypes (S-type(SS, LS)=8, L-type(LL)=8). All participants performed exhausted exercise under 35℃(50% humidity) circumstance during 30 minnutes at ventilatory threshold intensity and then immediately run with gradual exercise type until no more performing. For the trial, blood samples were collected at pre exercise(baseline), post-VT exercise(during exercise), post-exercise, after 30min(recovery). we analyzed dopamine, serotonin, prolactin, ammonia and also rectal temperature as core temperature and the other factors including lactate, pH and the rate of self-Perceived fatigue at each trial. The results were followed as blow : first, VO2 of S type at post exercise were higher than L types significantly(p>.05). Second, there was no difference in plasma serotonin between 5-HTT types(p>.05). Third, there was no differenence in dopamine and in prolactin of 5-HTT types(p>.05). Forth, ammonia, pH, lactate, rectal temperature and rate of self-perceived fatigue had no difference by genotype(p>.05). Fifth, rate of self-perceived fatigue of L type had the significant influence by prolactin(p<.05), whereas S type had influence by dopamine(p<.05). With these results leaded the conclusions that according to the 5-HTT gene polymorphism the difference of central fatigue caused by exhausted exercise under hot environment might not be assured.
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