Aerobic capacity of a subject depends on proper functioning of both cardiovascular and respiratory system to deliver adequate amount of oxygen to exercising muscles. It is effected by oxidative stress and can be benefited by prolong supplementation with dietary antioxidants. In the present study, we evaluated the effect of supplementation with two different doses ( 500mg/day and 1000mg/day) of vitamin C ( ascorbic acid ) for 21 days on young healthy nonathletic male subject . Various anthropometric parameters, body composition, blood pressure, FEV 1 , FVC and VO2 max were recorded before and after supplementation and were compared with a parallel run placebo group. The results indicated that there was no significant differences in any of the parameters studied before and after supplementation in all the three groups. Therefore, we concluded that daily consumption of either 500mg or 1000mg of vitamin C for 21 days have no beneficial effect on aerobic capacity, blood pressure and pulmonary functions of the subjects.
