Author(s)

Levi W. Evans, Fan Zhang, Stanley T. Omaye

Agriculture, Nutrition and Veterinary Sciences Department, University of Nevada, Reno, USA.

Vitamin C is a popular supplement in exercise and sport for its chemical properties i.e.v antioxidant capabilities. However, no clear role has been established for vitamin C supplementation (VCS) within these areas despite nearly a century’s worth of ongoing research. This study examined peak muscular pushing force (PMF) before and after a VCS intervention, 250 mg every 12 hrs for 28 days, in nine participants whom were naive to VCS and resistance exercise (RE). A dynamometer was used to perform two RE bouts, pre- and post-intervention, that quantified PMF during a state of exercise-induced oxidative stress (EI-OS). Saliva was collected for EIOS analysis from each participant before and after each RE bout; salivary vitamin C (VC) and free salivary malondialdehyde (MDA) were the examined biomarkers. PMF increased significantly post-intervention (405.48 ± 92.75 m·kg·s^-2) from baseline (368.31 ± 76.36 m·kg·s^-2, p < 0.05). MDA elevated significantly after the pre-intervention RE bout (0.385 ± 0.017 μg/mL) and the post-intervention RE bout (0.373 ± 0.014 μg/mL) compared to the baseline measures (0.373 ± 0.014 μg/mL, 0.359 ± 0.008 μg/mL; p < 0.01); a significant reduction in MDA was observed post-intervention, confirming vitamin C’s ability to reduce oxidative stress (p < 0.05). VC increased post-intervention (1.22 ± 0.73 μg/mL) from baseline (0.47 ± 0.51 μg/mL, p < 0.001). The results from this study suggest VCS is capable of increasing PMF by reducing EIOS in untrained individuals, and can be possibly used for enhancing resistance-exercise performance.

Untrained Persons, Free Salivary Malondialdehyde, Isokinetic Exercise

Evans, L. , Zhang, F. and Omaye, S. (2017) Vitamin C Supplementation Reduces Exercise-Induced Oxidative Stress and Increases Peak Muscular Force. Food and Nutrition Sciences, 8, 812-822. doi: 10.4236/fns.2017.88058.