Introduction: Free radical (FR) levels may show changes following to acute and prolonged physical exercise. These parameters have certain activity and concentration characteristics and changes in these parameters may mean adaptation or maladaptation of reserves. The aim of this study was to evaluate the relationship between free radicals and AnT and V02 max in professional soccer players during a competition half-season. Methods: We included 30 professional soccer players from a soccer club of our National soccer league in this study. All sport medical examinations were conducted tree times: before preparation phase, before competition phase and after finishing the competition phase. Venous blood was taken before and after maximal exercise test and free radicals were determinate by method of DEROM. AnT (km/h and beat/min) was determinate with Conconi protocol and VO2 max (ml/kg/min) by indirect protocol on treadmill. We used descriptive statistics and correlations (p<0.05). Results: Taking into account all three phases of training process, FR plasma levels increased significantly at the end of half-season (269.25±39.49; 295.98±31.57; 333.29±40.74). There were significant changes of VO2 max (48,31±4.08; 51,31±4.16; 49.5±4.81) during the season, with insignificant changes of AnT (12,7±0,80; 12,73±1,71; 12,2±1,47). There were significant negative correlation between FR plasma levels after maximal exercise test and VO2 max before the competition phase. Discussion: The significant increasing of FR plasma levels at the end of half-season suggest that oxidative stress increased at the end of prolonged training and competitions. The antioxidant defense mechanisms maybe depleted at the end of a season. This study shows that a significant increase of aerobic capacity is connected with a lower oxidative stress.
© Copyright 2014 19th Annual Congress of the European College of Sport Science (ECSS), Amsterdam, 2. - 5. July 2014. Veröffentlicht von VU University Amsterdam. Alle Rechte vorbehalten. / Übersetzt mit https://www.DeepL.com/Translator