Live high train low (LHTL) is a well-known training model for preparation of competitions. In this study, the thiobarbituric acid reacting substances (TBARS) levels and superoxide dismutase (SOD) activity were determined in heart, lung and muscle tissues of rats. They were intermittently exposed to hypobaric pressure of 523 mmHg, corresponding to an altitude of 3,000 m, and they performed swim training at sea level. Two groups of male rats were trained to swim for thirty minutes a day and 4 days a week, lasting 9 weeks. Two groups were exposed to hypobaria for 120 min a day and 4 days a week for 9 weeks in pressure cabin
