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Antioxidant vitamin supplementation prevents oxidative stress but does not enhance performance in young football athletes

de Oliveira, Donizete CX, Rosa, Flavia Troncon, Simões-Ambrósio, Lívia, Jordao, Alceu Afonso, Deminice, Rafael
Nutrition 2019
antioxidants, ascorbic acid, athletes, blood sampling, creatine, exercise, jumping, lipid peroxidation, malondialdehyde, muscles, oxidative stress, placebos, protocols, vitamin supplements
The aim of this study was to verify the effects of supplementation with antioxidants (vitamins C and E) on oxidative stress, DOMS, and performance in football players during a recovery period after an exercise-induced oxidative stress protocol. Twenty-one football athletes were randomly assigned to 2 groups: placebo and antioxidants supplemented. The supplementation was performed in a double-blind controlled manner using vitamin C (500mg/d) and E (400UI/d) for a total of 15-days. After 7-days of supplementation, athletes were submitted to an exercise-induced oxidative stress protocol consisted in plyometric jumping and strength resistance sets to exhaustion. Blood samples, performance tests and delayed onset muscular soreness were determined before and 24h, 48h and 72h after exercise. Antioxidant supplementation remained during the recuperation week in a total of 15-days. Antioxidant supplementation caused a significant increase in plasma vitamin C and E. The antioxidant supplementation could inhibit oxidative stress characterized by elevated lipid peroxidation markers malondialdehyde and total lipid peroxidation as well as reduced GSH/GSSG ratio promoted by exercise. Antioxidants supplementation however, did not significantly reduce the plasma creatine kinesis concentration or delayed onset muscular soreness during the recovery days. Likewise, supplementation with vitamin C and E did not improve lower-body power, agility, anaerobic power or provided any indicative of faster muscle recovery. In conclusion, antioxidant supplementation does not attenuate elevated markers of muscle damage or muscle soreness promoted by acute exercise and do not exert any ergogenic effect on football performance of young athletes, even though it reduced oxidative stress.