Grape Polyphenols May Help Reduce Exercise-Induced Oxidative Stress

Exercise increases free radical formation, which can cause temporary oxidative stress in the muscles. A new study has found that polyphenols in grape products may help reduce oxidative stress associated with exercise.

For their study, the researchers looked at data from 12 clinical trials. The trials involved supplementation with grape beverages or grape extracts. Participants ranged from high level amateur to elite level athletes competing in a variety of sports. 

The researchers found that grape polyphenols had a positive effect on exercise-induced oxidative stress. The results seen were dependent on the supplement dose, the length of the supplementation period, and the total polyphenol content.

The study was conducted by researchers from the Basque Research and Technology Alliance.It was published online ahead of print on January 7, 2012 in theJournal of the International Society of Sports Nutrition.