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This study investigated the changes in oxidative stress biomarkers and antioxidant status indices caused by a 3-week high-intensity interval training (HIT) regimen. Eight physically active males performed three HIT sessions/week over 3. weeks. Each session included four to six 30-s bouts of high-intensity cycling separated by 4. min of recovery. Before training, acute exercise elevated protein carbonyls (PC), thiobarbituric acid reactive substances (TBARS), glutathione peroxidase (GPX) activity, total antioxidant capacity (TAC) and creatine kinase (CK), which peaked 24. h post-exercise (252 ± 30%, 135 ± 17%, 10 ± 2%, 85 ± 14% and 36 ± 13%, above baseline, respectively; p<. 0.01), while catalase activity (CAT) peaked 30. min post-exercise (56 ± 18% above baseline; p<. 0.01). Training attenuated the exercise-induced increase in oxidative stress markers (PC by 13.3 ± 3.7%; TBARS by 7.2 ± 2.7%, p<. 0.01) and CK activity, despite the fact that total work done was 10.9 ± 3.6% greater in the post- compared with the pre-training exercise test. Training also induced a marked elevation of antioxidant status indices (TAC by 38.4 ± 7.2%; CAT by 26.2 ± 10.1%; GPX by 3.0 ± 0.6%, p<. 0.01). Short-term HIT attenuates oxidative stress and up-regulates antioxidant activity after only nine training sessions totaling 22. min of high intensity exercise, further supporting its positive effect not only on physical conditioning but also on health promotion. © 2013 Elsevier Ltd.

High‐intensity activities during a soccer game, such as sprints, accelerations, change of direction, jumps, shoot, requires high force through the Stretch – Shortening Cycle (SSC), which is associated with the exercise – induced muscle damage. Consequences of muscle damage are muscle soreness and loss of muscle power. The aim of this study was to investigate the effect of two consecutive soccer games on indices of exercise – induced muscle damage (EIMD) and physical performance (PP). In this study participated 10 soccer players (age: 20.7years, height: 177cm, weight: 73kg, body fat: 6.4%, VO2max 55 ml/kg/min) who joined the first week of experimental design without playing in matches. The second week included two soccer games which had 90 minutes duration and separated 72 hours. Measurements executed daily in the morning during first and second week up to 48 hours after the second soccer game. The EIMD determined through thigh circumferences, knee joint of range motion (KJRM) and delayed onset of muscle damage (DOMS). The PP determined through squat jump (SJ) and countermovement jump (CJ). Data was analyzed with ANOVA repeated measures. Results show that thigh circumferences were significantly different 48 hours after the first and second game, and DOMS was higher 24 and 48 hours after second game. PP deteriorated in both SJ and CJ which is ranged between 10‐20% with the greatest decrement 48 hours after the soccer games. In conclusion, the two soccer games caused noticeable changes in the EIMD and PP indices. Coaches should plan suitable training sessions after games taking account of enough recovery period for the players.