Physical activity raises oxygen demand by many fold, causing a paralle
l increase in the formation of oxygen radical species. Vitamins are co
ncerned with either energy metabolism or free radical scavenging, This
review outlines the possible damage to cell structures following stre
nuous exercise and the role of vitamins as part of natural anti-oxidan
t defence systems, A brief discussion is included on the relationship
between physical activity, the immune system and cancer.