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چکیده
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Introduction: Severe and long physical activity especially in a hot and humid environment produces reactive oxygen species (ROS). This study aimed to investigate the effect of short-term the use of a two-week pre-cooling strategy and supplementation coenzyme Q10 (CoQ10) on superoxide dismutase (SOD) and creatine kinase (CK) serum in adolescent and elite swimmers during heavy and regular training and recording of freestyle swimming. Methodology: 36 healthy males (mean ± SD; age: 17.5±1.1, body fat content: 14.55±1.75 %) were randomly selected and divided into four groups of CoQ10 (300 mg daily), precooling (immersion in the water 0.5±18○C), supplementation+ precooling, and control, each with 9 participants. During an 18-session protocol in the morning and evening, participants attended speed and endurance trainings for 5 km every session. A three-stage blood sampling was conducted before the first recording and before and after the second recording in 800, 200 and 50 m. Repeated measurement and the Bonferroni correction were used for the statistical analysis of the data (α=0.05). Results: According to the results, there was no significant difference between the mean serum level of SOD and CK in the groups at the first stage of blood sampling (P>0.05). At the second stage, precooling and control groups show a significant increase compared to the supplementation and supplementation+precooling groups (P<0.05). At the third stage, a significant difference was observed among all groups (P<0.05). Discussion: As an antioxidant and regulator of body temperature, CoQ10 supplementation prevented adverse changes of antioxidant and muscle damage enzymes during heavy trainings and swimming recording, decreasing their serum level. While precooling increased serum level of enzymes individually. Maybe, precooling decreases body core temperature of swimmers by itself.
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