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Vitamin C (ascorbic acid) was supplemented (1 g/day) for 1 day and 2 weeks in the same subjects. Plasma thiobarbituric acid reacting substances (TBARS) and oxygen radical absorbance capacity (ORAC) before and after 30 min submaximal exercise were measured. Different vitamin C supplementations did not affect resting TBARS or ORAC. Following 30 min exercise, values for TBARS were 12.6 and 33% above rest with l day and 2 weeks of vitamin C supplementation, respectively, compared to 46% higher with placebo. ORAC did not significantly change (11%) after exercise with a placebo, nor when subjects were given vitamin C supplements for l day or 2 weeks (4.9% and 5.73%, respectively). TBARSORAC, a ratio representing oxidative stress, increased 32%(p< 05) with placebo compared to 5.8 and 25.8% with vitamin C supplements for l day and 2 weeks, respectively. It was concluded that exercise …