Amino Acids

, Volume 32, Issue 3, pp 381–386

Effects of β-alanine supplementation on the onset of neuromuscular fatigue and ventilatory threshold in women

Authors

  • J. R. Stout
    • Department of Health and Exercise ScienceUniversity of Oklahoma
  • J. T. Cramer
    • Department of Health and Exercise ScienceUniversity of Oklahoma
  • R. F. Zoeller
    • Department of Exercise Science and Health PromotionFlorida Atlantic University
  • D. Torok
    • Department of Exercise Science and Health PromotionFlorida Atlantic University
  • P. Costa
    • Department of Exercise Science and Health PromotionFlorida Atlantic University
  • J. R. Hoffman
    • Department of Health and Exercise ScienceThe College of New Jersey
  • R. C. Harris
    • School of Sport Exercise and Health SciencesUniversity of Chichester
  • J. O’Kroy
    • Department of Exercise Science and Health PromotionFlorida Atlantic University
Article

DOI: 10.1007/s00726-006-0474-z

Cite this article as:
Stout, J., Cramer, J., Zoeller, R. et al. Amino Acids (2007) 32: 381. doi:10.1007/s00726-006-0474-z

Summary.

This study examined the effects of 28 days of β-alanine supplementation on the physical working capacity at fatigue threshold (PWCFT), ventilatory threshold (VT), maximal oxygen consumption (\(\dot{\rm V}\)O2-MAX), and time-to-exhaustion (TTE) in women. Twenty-two women (age ± SD 27.4 ± 6.1 yrs) participated and were randomly assigned to either the β-alanine (CarnoSyn™) or Placebo (PL) group. Before (pre) and after (post) the supplementation period, participants performed a continuous, incremental cycle ergometry test to exhaustion to determine the PWCFT, VT, \(\dot{\rm V}\)O2-MAX, and TTE. There was a 13.9, 12.6 and 2.5% increase (p < 0.05) in VT, PWCFT, and TTE, respectively, for the β-alanine group, with no changes in the PL (p > 0.05). There were no changes for \(\dot{\rm V}\)O2-MAX (p > 0.05) in either group. Results of this study indicate that β-alanine supplementation delays the onset of neuromuscular fatigue (PWCFT) and the ventilatory threshold (VT) at submaximal workloads, and increase in TTE during maximal cycle ergometry performance. However, β-alanine supplementation did not affect maximal aerobic power (\(\dot{\rm V}\)O2-MAX). In conclusion, β-alanine supplementation appears to improve submaximal cycle ergometry performance and TTE in young women, perhaps as a result of an increased buffering capacity due to elevated muscle carnosine concentrations.

Keywords: Carnosine – β-Alanine – Ergogenic aids – Electromyography – Cycle ergometry

Copyright information

© Springer-Verlag 2006