Influence of exercise on oxidant stress products in elite Indian cyclists

AUTOR(ES)

Lekhi, Chhavi

FONTE

BMJ Group

RESUMO

The influence of exercise on free‐radical chemistry is not well understood. It is yet to be confirmed whether an adequate biochemical defence system exists in the human body to provide protection from oxy‐centred radicals generated by exercise. Fifty trained elite cyclists undertaking exhaustive endurance training were compared with a control group of 50 sedentary workers. Serum malondialdehyde (MDA), uric acid, superoxide dismutase (SOD), catalase, vitamin E, vitamin C and susceptibility to oxidative stress were assessed. Exhaustive exercise resulted in significantly (p<0.05) higher concentrations of serum MDA, vitamin E and vitamin C, significantly (p<0.001) higher SOD activity, but less significantly (p<0.01) higher concentrations of uric acid and significantly (p<0.05) lower catalase activity in elite cyclists than in the controls. Alterations in the activities of erythrocyte scavenger enzymes (SOD) and higher level of non‐enzymatic defences in trained subjects may not be sufficient to counteract the increase in reactive oxygen species produced by endurance training.

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