title: Proxidant* antioxidant balance in supplemented elite female volleyball athletes during a six week training period.
abstract: OBJECTIVE
  The objectives of this study were: 1) to evaluate pro-oxidant-antioxidant balance (PAB) associations with the commonly measured parameters of oxidative stress and antioxidatve defence in elite female volleyball athletes; 2) to investigate changes in the parameters of oxidative stress during a period of intense training and dietary antioxidant supplementation.
  
  
  METHODS
  Twenty-seven female volleyball players participated in this study. Blood samples were collected the day before the pre-competitive mesocycle training period began. After the first blood sample donation and during the next six weeks fourteen players (supplemented group) received a cocktail of antioxidants while thirteen of them (control group) received no dietary supplementation. The following parameters were measured: reactive oxygen metabolites (ROMs), superoxide anion (O2-), malondialdehyde (MDA), advanced oxidation protein products (AOPP), lipid hydroperoxides (LOOH), biological antioxidative potential (BAP), paraoxonase activity toward paraoxon (POase) and diazoxon (DZOase), superoxide dismutase (SOD), total sulphydryl group concentration (SH groups) and pro-oxidant-antioxidant balance.
  
  
  RESULTS
  Significant associations were observed between biomarkers of oxidative damage with PAB in multiple linear regression model in the supplemented and the control groups (82.3% vs. 83.1%) before training and in the control group (82.1%) after training. Significant associations between antioxidative defence parameters and PAB values were found in the supplemented group after six-weeks of training (57%).
  
  
  CONCLUSIONS
  In the absence of antioxidant supplementation, PAB values were dependent on the association with biomarkers of oxidative damage before and after training. After a six-week training period and the applied antioxidant supplementation, PAB values were under the influence of non-enzymatic anti-oxidative defence.
authors.affiliation: Institute of Medical Biochemistry, University of Belgrade, Belgrade, Serbia.
authors.forename: J
authors.initials: J
authors.lastname: Martinović
authors.forename: V
authors.initials: V
authors.lastname: Dopsaj
authors.forename: J
authors.initials: J
authors.lastname: Kotur-Stevuljević
authors.forename: M
authors.initials: M
authors.lastname: Dopsaj
authors.forename: A
authors.initials: A
authors.lastname: Vujović
authors.forename: A
authors.initials: A
authors.lastname: Stefanović
authors.forename: G
authors.initials: G
authors.lastname: Nesić
mesh_terms: D000293:Adolescent; D000328:Adult; D000975:Antioxidants / Q000008:administration & dosage*; D019587:Dietary Supplements; D015444:Exercise / Q000502:physiology*; D005260:Female; D005609:Free Radicals / Q000097:blood*; D006801:Humans; D018384:Oxidative Stress / Q000502:physiology*; D054798:Volleyball / Q000502:physiology*; D055815:Young Adult
chemical_list: D000975:Antioxidants; D005609:Free Radicals