title: Oxidative stress and nitrite dynamics under maximal load in elite athletes: relation to sport type.
abstract: Maximal workload in elite athletes induces increased generation of reactive oxygen/nitrogen species (RONS) and oxidative stress, but the dynamics of RONS production are not fully explored. The aim of our study was to examine the effects of long-term engagement in sports with different energy requirements (aerobic, anaerobic, and aerobic/anaerobic) on oxidative stress parameters during progressive exercise test. Concentrations of lactates, nitric oxide (NO) measured through stabile end product-nitrites (NO(2) (-)), superoxide anion radical (O(2) (•-)), and thiobarbituric reactive substances (TBARS) as index of lipid peroxidation were determined in rest, after maximal workload, and at 4 and 10th min of recovery in blood plasma of top level competitors in rowing, cycling, and taekwondo. Results showed that sportmen had similar concentrations of lactates and O(2) (•-) in rest. Nitrite concentrations in rest were the lowest in taekwondo fighters, while rowers had the highest levels among examined groups. The order of magnitude for TBARS level in the rest was bicycling > taekwondo > rowing. During exercise at maximal intensity, the concentration of lactate significantly elevated to similar levels in all tested sportsmen and they were persistently elevated during recovery period of 4 and 10 min. There were no significant changes in O(2) (•-), nitrite, and TBARS levels neither at the maximum intensity of exercise nor during the recovery period comparing to the rest period in examined individuals. Our results showed that long term different training strategies establish different basal nitrites and lipid peroxidation levels in sportmen. However, progressive exercise does not influence basal nitrite and oxidative stress parameters level neither at maximal load nor during the first 10 min of recovery in sportmen studied.
authors.affiliation: Department of Physiology, Faculty of Medicine, University of Kragujevac, Svetozara Markovica 69, PO Box 124, 34000 Kragujevac, Republic of Serbia.
authors.forename: Dejan
authors.initials: D
authors.lastname: Cubrilo
authors.forename: Dusica
authors.initials: D
authors.lastname: Djordjevic
authors.forename: Vladimir
authors.initials: V
authors.lastname: Zivkovic
authors.forename: Dragan
authors.initials: D
authors.lastname: Djuric
authors.forename: Dusko
authors.initials: D
authors.lastname: Blagojevic
authors.forename: Mihajlo
authors.initials: M
authors.lastname: Spasic
authors.forename: Vladimir
authors.initials: V
authors.lastname: Jakovljevic
mesh_terms: D000293:Adolescent; D015308:Anaerobic Threshold; D000704:Analysis of Variance; D056352:Athletes; D015444:Exercise; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D007773:Lactates / Q000097:blood; D015227:Lipid Peroxidation; D008297:Male; D009573:Nitrites / Q000097:blood*; D018384:Oxidative Stress; D005082:Physical Exertion; D026361:Reactive Nitrogen Species / Q000097:blood; D017382:Reactive Oxygen Species / Q000097:blood; D013177:Sports; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D055815:Young Adult
chemical_list: D007773:Lactates; D009573:Nitrites; D026361:Reactive Nitrogen Species; D017382:Reactive Oxygen Species; D017392:Thiobarbituric Acid Reactive Substances