Prolonged and exhaustive exercise has been reported to be associated with oxidative stress. Oxidative stress is defined as an imbalance between production and clearance of free radicals (reactive oxygen and reactive nitrogen species). This study was designed to investigate or examine the effect of Montmorency Cherry Juice supplements in reducing the damaging effect oxidative following extraneous exercise. The study was carried out in the department of applied sciences, Abdu Gusau Polytechnic Talata Mafara in Ten (10) months. Materials and methods: The study involved 14 adults which are mostly involved in regular exercise especially football on daily basis, the participants were students of Abdu Gusau Polytechnic, they were divided into two equal numbers with group one taking the Cherry Juice supplement and the other group taking a placebo. Five samples each of plasma and sputum were collected from the participant (Pre-marathon, immediately post marathon, 24 hours post marathon, 48 hrs post marathon and 72 hrs post marathon) whereby C- reactive protein were analyzed in the plasma and sputum of the participants (both groups) by Enzyme Linked Immunosorbent Assay (DuoSet Elisa kit purchased from R&D system. Results: The data were statistically analyzed using standard analytical method by a paired t- test using a minitab to find out a correlation between pre-post marathons, post-24hrs post, and so on. The results shows an increase in CRP in all the plasma samples examined whereas only few sputum samples. The study concluded that the cherry juice supplement was found to affect serum and sputum CRP level in marathon runners because the level of expression in placebo groups were found to be lower than that of Montmorency cherry juice. Key words: Oxidative stress, Cherry juice, Inflammation, upper airways, Montmorency cherry juice
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