title: Ingestion of oxygenated water enhances lactate clearance kinetics in trained runners.
abstract: BACKGROUND
  Drinks with higher dissolved oxygen concentrations have in recent times gained popularity as a potential ergogenic aid, despite a lack of evidence regarding their efficacy. The aim of this study was to assess effects of ingestion of an oxygen supplement (OS) on exercise performance and post-exercise recovery in a group of trained runners.
  
  
  METHODS
  Trained male runners (n =25, mean ± SD; age 23 ± 6 years, mass 70 ± 9 kg, BMI 21.9 ± 2.7 kg.m-2VO2max 64 ± 6mL.kg-1.min-1), completed a randomised double blinded, crossover study to assess the effect of ingestion of OS solution on exercise performance and recovery. Trials consisted of a 30min rest period, 5min warm-up, a 5000m treadmill time-trial, and a 30min passive recovery. Participants ingested 6x15mL of either OS or a taste matched placebo during the trials (3 during the rest phase, 1 during exercise and 2 during the recovery). Muscle tissue O2saturation was measured via near infrared spectroscopy. Blood lactate concentrations were measured prior to, mid-way and directly after the finish of the 5000m time trials and every 3-min during the post-exercise recovery.
  
  
  RESULTS
  Ingestion of OS did not improve exercise performance. No significant differences were observed for muscle tissue O2saturation at any time-points. However, lactate clearance was significantly improved during recovery in the OS trials. Both AUC (109 ± 32 vs. 123 ± 38 mmol.min,P <0.05, d = 0.40) and lactate half-life (λ) (1127 ± 272 vs. 1223 ± 334 s,P <0.05, d = 0.32) were significantly reduced.
  
  
  CONCLUSIONS
  Despite no evidence of improved exercise performance, ingestion of OS did enhance post-exercise recovery via increased lactate clearance.
authors.affiliation: Human Performance Laboratory, Department of Anatomy, Trinity College Dublin, Dublin, Ireland.
authors.forename: Neil
authors.identifier: 0000-0003-1288-5363
authors.initials: N
authors.lastname: Fleming
authors.affiliation: Department of Exercise Physiology, Kent State University, Kent, Ohio USA.
authors.forename: Jeremiah
authors.initials: J
authors.lastname: Vaughan
authors.affiliation: Movement Science Department, Grand Valley State University, Allendale, Michigan USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Feeback
mesh_terms: D018592:Cross-Over Studies; D004311:Double-Blind Method; D006801:Humans; D019344:Lactic Acid / Q000097:blood / Q000378:metabolism*; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism; D010100:Oxygen / Q000008:administration & dosage / Q000494:pharmacology*; D010807:Physical Endurance / Q000187:drug effects; D012420:Running; D064133:Sports Nutritional Physiological Phenomena; D014867:Water / Q000008:administration & dosage / Q000494:pharmacology*; D055815:Young Adult
chemical_list: D014867:Water; D019344:Lactic Acid; D010100:Oxygen
keywords: Hydration; Recovery; Running