title: The acute effects of interval exercise on oxidative stress and antioxidant status in volleyball players.
abstract: BACKGROUND
  Volleyball is briefly described as an "interval" sport with both aerobic and anaerobic components. Exercise may influence antioxidant/prooxidant balance, which leads to differences in oxidative stress status between athletes in different sport disciplines, but the results of the previous studies are inconsistent. In this study, we aimed to determine the acute effects of exercise on oxidative stress parameters such as serum total oxidant status (TOS) and total antioxidant status (TAS) levels in volleyball players.
  
  
  METHODS
  Thirteen male volleyball players from the same team participated in this study. The volleyball game lasted approximately 95 minutes including warm-up and cool-down periods. Blood samples were taken before the warm-up and after the cool down. Serum TOS and TAS levels were measured. Oxidative stress index (OSI), a predictor of antioxidant/prooxidant balance (TOS/TAS), was also calculated.
  
  
  RESULTS
  The following data were revealed as median: TOS 6.84 μmol H2O2 Eq/L (95% CI: 5.80-8.13) and 5.15 (95% CI: 4.20-6.02); TAS 1.96 mmol Trolox Eq/L (95% CI: 1.91-2.08) and 1.95 (95% CI: 1.86-2.00); and OSI indexes, 3.31 (arbitrary unit) (95% CI: 2.84-4.00) and 2.64 (95% CI: 2.26-3.18) before and after the match with respectively. Serum TOS and OSI levels were significantly lower after volleyball match when compared to before (P<0.05). There was no significant difference in serum TAS levels (P>0.05).
  
  
  CONCLUSIONS
  In individuals who exercise active sports, TOS level has been found to be decreased while TAS level has not been affected significantly after volleyball match. Our results suggested that volleyball training may not cause oxidative stress in these players. Regular physical exercise especially, volleyball training may provide adequate protection against exercise-induced oxidative stress.
authors.affiliation: Department of Clinical Biochemistry, Faculty of Medicine, Hitit University, Çorum, Turkey - kocabasr@gmail.com.
authors.forename: Ramazan
authors.initials: R
authors.lastname: Kocabaş
authors.affiliation: Department of Biochemistry, Faculty of Medicine, University of Gaziantep, Gaziantep, Turkey.
authors.forename: Emine S
authors.initials: ES
authors.lastname: Namiduru
authors.affiliation: School of Physical Education and Sports, University of Gaziantep, Gaziantep, Turkey.
authors.forename: Adnan M
authors.initials: AM
authors.lastname: Bagçeci
authors.affiliation: Department of Emergency Medicine, Faculty of Medicine, Hitit University, Çorum, Turkey.
authors.forename: Ali K
authors.initials: AK
authors.lastname: Erenler
authors.affiliation: School of Physical Education and Sports, University of Gaziantep, Gaziantep, Turkey.
authors.forename: Önder
authors.initials: Ö
authors.lastname: Karakoç
authors.affiliation: Şehit Kamil State Hospital, Gaziantep, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Örkmez
authors.affiliation: Department of Biochemistry, Faculty of Medicine, University of Gaziantep, Gaziantep, Turkey.
authors.forename: Müslüm
authors.initials: M
authors.lastname: Akan
authors.affiliation: Biochemistry Laboratory, Çorum Training and Research Hospital, Çorum, Turkey.
authors.forename: Hacı K
authors.initials: HK
authors.lastname: Erdemli
authors.affiliation: Department of Biochemistry, Faculty of Medicine, University of Gaziantep, Gaziantep, Turkey.
authors.forename: Seyithan
authors.initials: S
authors.lastname: Taysi
authors.affiliation: Department of Biochemistry, Faculty of Medicine, University of Gaziantep, Gaziantep, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Tarakçioglu
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000032:analysis / Q000378:metabolism*; D015444:Exercise; D005260:Female; D006801:Humans; D006861:Hydrogen Peroxide; D008297:Male; D016877:Oxidants / Q000097:blood; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000097:blood; D054798:Volleyball / Q000502:physiology*
chemical_list: D000975:Antioxidants; D016877:Oxidants; D017382:Reactive Oxygen Species; D006861:Hydrogen Peroxide