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Objective: Aim of the study is to investigate the effects of annual swimming season, training (TP), detraining (DTP) and retraining periods (RTP) on blood oxidative stress and physical performance levels and the relationships between these parameters in children. Material and Methods: 10 trained, mean 11.1±0.6 years old male swimmers were joined the study. Critical speed (CS) as endurance performance criteria were calculated from maximum 50 m and 400 m freestyle swimming performances (MFSP) times. Serum total antioxidant status (TAS), total oxidant status (TOS) and oxidative stress index (OSI; TOS/TAS ratio) and biochemical markers of over training (OT) as urea, uric acid and aspartate aminotransferase (AST) were measured after TP, DTP and RTP subsequently every two months. TP measurement was performed 4 days after national swimming championship. Statistics significance was accepted as p<0.05. Results: MFSP times, CS and height were increased significantly after every period. TAS was higher at DTP than TP (p< 0,05) unlike TOS and OSI (p<0.01). TOS was increased where uric acid decreased at RTP (p< 0.05) compared to DTP, but no change in the other biochemical markers. No significant relationship was found between CS, MFSP times and body height with TOS and OSI with in any period. Conclusion: TP and RTP increased oxidative stress while DTP recovered. The developments in swimming performances and height were not affected from oxidative stress in any period. The given 4 days of recovery after competition realized following TP was not enough for oxidative stress toleration. Therefore, pursuance of whole season health status and performance levels of children is recommended.

The Effects of Annual Swimming Season on Oxidative Stress and Swimming Performance in Children