운동생리학 : 흰쥐에서 홍차 추출물이 체중 및 복부 지방에 미치는 영향

The aims of this study were to evaluate the effects of black tea on body weight gain and visceral fat mass in normal rat chow diet fed Sprague-Dawley rats. Rats (n=12 per group) were randomly divided into rat chow diet(control), exercise and black tea diet groups. Control and exercise groups were provided with rat chow diet while the black tea group consumed 5 times concentrated black tea water-extract supplemented (1% w/w) rat chow diet for 4 weeks. The treadmill running for exercise group was loaded as an exercise five days a week for 4 weeks. a running speed of 20 m/min with slope zero degree for 50 minutes at the 1st week, 22 m/min with slope 2 degree for 60 minutes at the 2nd and 3rd weeks, and 22 m/min with slope 5 degree for 60 minutes at the last week Supplementation of black tea extract significantly decreased body weight gain and visceral fat mass compared with control diet group (p<.05 and p<.01, respectively). Exercise did not decrease body weight gain, but decreased visceral fat by 25%(p<.05) Total food intake for 4 wk feeding was not differ significantly among groups, but total feces content for 4 wk feeding was higher in black tea group than in control and exercise groups. In in vitro study, black tea extract inhibited significantly both the pancreatic lipase and alpha-amylase activities dose dependently. In conclusion, we found the anti-obesity effect of black tea and the possible mechanism might be a decrease in fat and carbohydrate digestions via inhibition of pancreatic lipase and alpha-amylases in gastrointestinal tract.