It has been suggested that antioxidant vitamins may beneficially modify potentially detrimental effects of endurance exercise. Whether daily Vitamin E supplementation affected post-race indicators of muscle damage or susceptibility of plasma lipids to peroxidation was assessed 24 hours prior to and immediately after the Hawaii Ironman Triathlon in 34 (M = 22; F = 12) competitors. It was found that Vitamin E raises plasma levels but has no immediate acute effect on either muscle damage or susceptibility to peroxidation. Implication. An effect of Vitamin E supplementation on endurance performance is unlikely.
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