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Effects of Green Tea on Hepatic Antioxidative Defense System and Muscle Fatigue Recovery in Rat after Aerobic Exercise

녹차가 유산소 운동 후 흰쥐 간조직의 항산화 작용 및 근피로 회복에 미치는 영향

  • 김미지 (대구가톨릭대학교 식품영양학과) ;
  • 이순재 (대구가톨릭대학교 식품영양학과)
  • Published : 2002.12.01

Abstract

The purpose of this study was to investigate the effects of green tea on hepatic antioxidative defense system and recovery of muscle fatigue in rat after aerobic exercise. Male Sprague-Dawley rats weighing 150$\pm$ 10 g were randomly assigned to one normal (N) group and aerobic exercise training groups. Exercise training groups were classified into two groups: training (T) group and green tea (TG) group which were supplemented the distilled water and green tea extracts by dringking water during experimental periods, respectively. The experimental rats in exercise training groups (T and TG) ran on a treadmill 30 min/day at a speed of 28 m/min (7% incline) 5 days/week or were cage confined (Normal group) for 4 weeks. And rats were sacrificed with an overdose of pentobarbital injection just after running. Hepatic xanthine oxidase (XOD) activities were not significantly different among three groups. The activity of superoxide dismutase (SOD) in T group was no significant difference from N group, but those of TG groups were significantly increased, compared with that of T group. Hepatic glutathione peroxidase (GSHpx) activites of TG groups showed a similar tendency to that of normal group, but it was increased to 20% in TG group, compared with normal group. The reduced glutathione (GSH) contents in liver was not significantly different from that of any three group. The oxidized glutathione (GSSG) contents in T group was increased to 69%, compared with the normal group, but TG group significantly decreased, compared with the T group. The ratio of GSH/GSSG in liver of T group was lower than that of normal group, but those of TG group was a similar tendency to that of normal group. Contents of thiobarbituric acid reactive substance(TBARS) in T group was increased to 52%, compared with that of normal group but those of TG group were recovered the normal level. Contents of hepatic glycogen in T group were decreased to 23% compared with those of normal group, while that of TG group was the same as normal levels. The contents of serum lactic acid in T group were increased to 261%, compared with normal group, but those of TG group maintained the normal level by green tea supplementations. In conclusion, the effects of green tea in exercise training rats would appear to reduce peroxidation of tissue as an antioxidative defense mechanism and promote recovery of muscle fatigue.

본 연구는 녹차가 흰쥐 간조직의 유산소 운동 후 항산화계와 근피로 회복에 미치는 영향 및 그 작용기전을 관찰하고자하였다. 실험동물은 150 g 내외의 Sprague-Dawley종 흰쥐를 정 상군과 트레드밀을 이용한 운동군으로 나눈 후 운동군은 다시 트레드밀 운동만 부가한 T군, 운동군에 녹차를 공급한 TG군으로 나누었다. 실험군 중 정상군과 T군은 식수로 증류수를 그리고 GT군은 5% 녹차 추출물을 식수로 공급하였으며 식이와 식수는 자유섭취시켰다. 운동은 국내에서 제작된 실험 소동물용 전동 트레드밀을 이용하여 실시하였으며 매일 30분씩 주 5회씩 부하시키면서 4주간 행하였다. 1. 간조직중의 SOD 활성은 실험군간의 유의적인 차이가 없었다. 2. 간조직중의 SOD활성은 정상군에 비해 T군에서 유의적 차이가 없으나, T군에 비해 녹차를 공급한 군인 TG군은 유의적으로 증가(p<0.05)되었다 3. 간조직중의 GSHpx활성은 T군에서는 정상군 수준이었고 녹차를 공급한 TG군에서는 정상군에 비해 20% 증가되었다. 4. 간조직중의 환원형 gluathione(GSH) 함량은 정상군과 운동군간의 유의적인 차이는 없었다. 산화형 glutathione(GSSG) 함량은 정상군에 비해 녹차를 공급하지 않은 T군에서 69% 증가되었으나 녹차를 공급한 TG군에서 유의적(p<0.05)으로 감소되었다. GSH/GSSG함량은 정상군에 비해 녹차를 공급하지 않은 T군에서 63% 감소되었으나 녹차를 공급한 TG군에서는 정상군 수준이었다. 5. 지질과산화물 함량은 정상군에 비해 T군에서 52% 증가되었고 T군에 비해 녹차를 공급한 TG군은 정상군 수준으로 회복되었다. 6. 혈중 포도당 함량은 실험군간에 차이가 없었다. 간조직 글리코겐 함량은 정상군에 비해 녹차를 공급하지 않은 T군에서 23% 감소되었으나 녹차를 공급한 TG군에서는 정상군 수준이었다. 7. 혈중 젖산 함량은 정상군에 비해 T군이 261% 증가되었고 T군에 비해 녹차를 공급한 TG군은 정상군 수준이었다. 결론적으로 녹차는 유산소 운동시 항산화계를 강화시키고 피로회복을 촉진시켰다.

Keywords

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