Panza Vilma Simões Pereira, Wazlawik Elisabeth, Ricardo Schütz Gustavo, Comin Leandro, Hecht Karl Christian, da Silva Edson Luiz
Department of Nutrition, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
Nutrition. 2008 May;24(5):433-42. doi: 10.1016/j.nut.2008.01.009. Epub 2008 Mar 12.
This study investigated the effects of the consumption of green tea (GT) for 7 d on biomarkers of oxidative stress in young men undergoing resistance exercise.
Fourteen subjects performed a bench press exercise (four sets, 10 to 4 repetitions) after undergoing a period without (control group) or with the intake of GT (GT group; 2 g of leaves in 200 mL of water, three times per day). Blood samples were obtained before and after exercise and analyzed for total antioxidant capacity (ferric reducing ability of plasma [FRAP]), total polyphenols, reduced glutathione (GSH), lipid hydroperoxide (LH) and thiobarbituric acid-reactive substances, creatine kinase (CK), aspartate aminotransferase (AST), xanthine oxidase (XO), hypoxanthine, and uric acid (UA).
In the control group, exercise did not affect the values of LH, thiobarbituric acid-reactive substances, and FRAP, although it did reduce the levels of GSH (P < 0.05). In addition, exercise increased CK, AST, and XO activities, although it did not change the values for hypoxanthine or UA. Green tea reduced the postexercise concentration of LH and increased the values of total polyphenols, GSH, and FRAP. GT also inhibited a significant rise in CK and XO activities induced by exercise. Furthermore, GT decreased the AST activity and hypoxanthine and UA concentrations before and after exercise. The assessment of food consumption revealed that the participants had an unbalanced diet, particularly in relation to vitamin E and carotenoids.
Consumption of GT, a beverage rich in polyphenols, may offer protection against the oxidative damage caused by exercise, and dietary guidance for sports participants should be emphasized.
本研究调查了连续7天饮用绿茶（GT）对进行抗阻运动的年轻男性氧化应激生物标志物的影响。
14名受试者在经历一段无绿茶摄入期（对照组）或有绿茶摄入期（GT组；2克茶叶泡于200毫升水中，每天三次）后进行卧推运动（四组，10至4次重复）。在运动前后采集血样，分析总抗氧化能力（血浆铁还原能力[FRAP]）、总多酚、还原型谷胱甘肽（GSH）、脂质过氧化氢（LH）、硫代巴比妥酸反应性物质、肌酸激酶（CK）、天冬氨酸转氨酶（AST）、黄嘌呤氧化酶（XO）、次黄嘌呤和尿酸（UA）。
在对照组中，运动虽降低了GSH水平（P<0.05），但未影响LH、硫代巴比妥酸反应性物质和FRAP的值。此外，运动增加了CK、AST和XO的活性，但未改变次黄嘌呤或UA的值。绿茶降低了运动后LH的浓度，增加了总多酚、GSH和FRAP的值。GT还抑制了运动诱导的CK和XO活性的显著升高。此外，GT降低了运动前后的AST活性以及次黄嘌呤和UA浓度。食物消费评估显示，参与者饮食不均衡，尤其是在维生素E和类胡萝卜素方面。
饮用富含多酚的GT饮料可能为运动引起的氧化损伤提供保护，应强调对运动参与者的饮食指导。
