The attention recently being paid to strain induction of oxidative stress has resulted in numerous studies, conducted mainly on sportsmen and laboratory animals, the majority of which focused on performing tests during a strenuous endurance effort (15, 31, 41, 54). As a consequence, the disturbance of the pro-oxidative/ anti-oxidative balance has been noted, which in most cases was manifested by a drop of activity of the main anti-oxidative enzymes in erythrocytes and muscle cells (65, 68), as well as an increase in content of products of lipid peroxidation in blood (11, 15, 58, 68). In spite of some discrepancies between them, the results of the research so far seem to indicate that the level of oxidative stress remains closely connected with the intensity and duration of physical strain (20, 42, 62). The aim of the paper was to present the impact of physical effort on the induction of oxidative stress in horses and to describe the features of anti-oxidative protection, in spite of some discrepancies between them, of the organism.
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