Abstract
Oxidative stress develops when the generation of free radicals exceeds the antioxidant capacity of cells or extracellular fluids. It can also occur as a result of physical exercise, and the pathogenesis of exercise-induced myopathies and haemolysis in horses may be related to changes in lipid peroxidation caused by free radicals. Cells have developed biochemical protection against oxidative stress and, as tissues seem to increase their antioxidant defences under chronic activation, training may be one of the ways of increasing antioxidant defences. Accordingly, we tested some enzymatic antioxidant activities as well as nonenzymatic antioxidants in horses undergoing special training. The results indicated a decrease in both chemical and biochemical defences against free radicals during training. It was deduced that the horses' diet may have been unable to provide the increased need for antioxidant defences resulting from training.
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