The Effect Of VC On Immunoendocrine And Oxidative Stress Responses To Exercise
Dr Parvin Babaei, Dept of Physiology,
Guilan University of Medical Sciences,
8th km of Rasht -Tehran road, Guilan University complex,
Faculty of medicine Email: firstname.lastname@example.org
Fax:0098 131 6690007 Tel:0098 131 3234196
The depression of the immune system function that is typically observed after strenuous exercise is believed to be possibly mediated by stress hormones, cytokines and oxidative stress. The aim of this study was to measure immunoendocrine and oxidative stress responses after the ingestion of two different doses of Vitamin C (VC) supplementation. Twenty-four healthy untrained males participated in a 30-min exercise at 75%Vo2max. Immediately pre-exercise, the participants received either of the following regimens: placebo, 500 mg and 1000 mg of VC. Blood samples were obtained prior to ingestion, immediately after ingestion, 2hrs after ingestion and also 2hrs and 24hrs after exercise.
Vitamin C used in doses of 500 mg and 1000 mg could significantly increase the plasma VC concentration and antioxidant capacity in both vitamin receiving groups. The increase in total antioxidant capacity (TAC) followed a significant decrease in post-exercise oxidative stress markers like malondialdehyde (MDA) (P<0.05). Markers of inflammation (total leukocytes, neutrophils and IL-6), muscle damage, creatine kinase (CK) and stress hormone (cortisol) were found to significantly increase in response to the exercise (P<0.05), but VC supplementation failed to decrease these factors significantly. The results suggest that acute supplementation with moderate and high doses of VC might prevent exercise-induced lipid peroxidation but not inflammatory markers.