Effect of Tomato and Guava juices on Oxidative Stress in Rats after Strenuous Exercise

Oxidative stress is thought to play an important role in the pathogenesis of numerous degenerative and chronic diseases. Some antioxidants in tomato and guava juices were found to have a powerful antioxidant effect. Sixty adult male albino rats were used to compare the effect of tomato and guava juices supplementation on oxidative stress. Xanthine oxidase (XO), Glutathion reductase (GR), Vitamin C, Malondialdehyde (MDA), Myeloperoxidase (MPO) and some parameter of liver and kidney functions were measured in groups of rats subjected to strenuous exercises fed on basal diet supplemented with different doses of tomato or guava juices compared with non supplemented rats as a control group. This study found that guava juice is more effective than tomato juice in impairment of oxidative damage caused by strenuous exercise leading to significant decrease in plasma and muscle XO, MDA as well as muscle MPO after exercise comparing with tomato juice. The difference in plasma vitamin C level between the group that given guava juice was significantly higher compared with group that given tomato juice (P 0.05)