Green Tea Demonstrates Antioxidant Effects in Performance Nutrition
OXFORD, Ohio--Animal research out of Miami University indicated green tea may protect against exercise-induced oxidative stress. The study, published in the October issue of Nutrition Research (22, 10:1177-88, 2002) (www.elsevier.com/locate/issn/02715317), involved 12 rats that were given green tea or water for 6.5 weeks. Half of each group ran for approximately 30 minutes. Researchers noted that green tea had no effect on resting heart rate, blood pressure, body weight, cholesterol or triglycerides, although it mildly influenced total plasma antioxidants, heart glutathione (a sulfur-containing antioxidant) and plasma vitamin C. Exercise impacted kidney and liver health in the rats that drank water, although this effect was not seen in the group that was given green tea. Researchers concluded green tea may have selective protective effects in the body, especially on the kidneys.