title: The effects of beta alanine plus creatine administration on performance during repeated bouts of supramaximal exercise in sedentary men.
abstract: OBJECTIVE
  The aim of this study was to investigate the effects of beta alanine and/or creatine supplementation on performance during repeated bouts of supramaximal exercise in sedentary men.
  
  
  METHODS
  Forty-four untrained healthy men (aged 20-22 years, weight: 68-72 kg, height: 174-178 cm) participated in the present study. After performing the Wingate Test (WAnT) for three times in the baseline exercise session, the subjects were assigned to one of four treatment groups randomly: 1) placebo (P; 10 g maltodextrose); 2) creatine (Cr; 5 g creatine plus 5 g maltodextrose); 3) beta-alanine (β-ALA; 1,6 g beta alanine plus 8,4 g maltodextrose); and 4) beta-alanine plus creatine (β-ALA+Cr; 1,6 g beta alanine plus 5 g creatine plus 3,4 g maltodextrose). Participants were given the supplements orally twice a day for 22 consecutive days, then four times a day for the following 6 days. After 28 days, the second exercise session was applied during which peak power (PP) and mean power (MP) were measured and fatigue index (FI) was calculated.
  
  
  RESULTS
  PP and MP decreased and FI increased in all groups during exercise before and after the treatment. During the postsupplementation session PP2 and PP3 increased in creatine supplemented group (from 642.7±148.6 to 825.1±205.2 in PP2 and from 522.9±117.5 to 683.0±148.0 in PP3, respectively). However, MP increased in β-ALA+Cr during the postsupplementation compared to presupplementation in all exercise sessions (from 586.2±55.4 to 620.6±49.6 in MP1, from 418.1±37.2 to 478.3±30.3 in MP2 and from 362.0±41.3 to 399.1±3 in MP3, respectively). FI did not change with beta alanine and beta alanine plus creatine supplementation during the postsupplementation exercise session.
  
  
  CONCLUSIONS
  Beta-alanine and beta alanine plus creatine supplementations have strong performance enhancing effect by increasing mean power and delaying fatigue Index during the repeated WAnT.
authors.affiliation: Division of Sports Physiology, Department of Physiology, Faculty of Medicine, Selcuk University, Konya, Turkey - mbelviranli@yahoo.com.
authors.forename: N
authors.initials: N
authors.lastname: Okudan
authors.forename: M
authors.initials: M
authors.lastname: Belviranli
authors.forename: H
authors.initials: H
authors.lastname: Pepe
authors.forename: H
authors.initials: H
authors.lastname: Gökbel
mesh_terms: D015308:Anaerobic Threshold / Q000187:drug effects; D003401:Creatine / Q000627:therapeutic use*; D019587:Dietary Supplements; D004311:Double-Blind Method; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D018763:Muscle Fatigue / Q000187:drug effects; D053580:Muscle Strength / Q000187:drug effects; D010919:Placebos; D011597:Psychomotor Performance / Q000187:drug effects*; D057185:Sedentary Behavior; D055815:Young Adult; D015091:beta-Alanine / Q000627:therapeutic use*
chemical_list: D010919:Placebos; D015091:beta-Alanine; D019344:Lactic Acid; D003401:Creatine