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The effect of Beta-Alanine supplementation on isokinetic force and cycling performance in highly trained cyclists

Citation

Howe, ST and Bellinger, PM and Driller, MW and Shing, CM and Fell, JW, The effect of Beta-Alanine supplementation on isokinetic force and cycling performance in highly trained cyclists, International Journal of Sports Nutrition and Exercise Metabolism, 23, (6) pp. 562-570. ISSN 1526-484X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Human Kinetics, Inc.

Official URL: http://journals.humankinetics.com/ijsnem-current-i...

DOI: doi:10.1123/ijsnem.23.6.562

Abstract

β-alanine may benefit short duration, high-intensity exercise performance. The aim of this randomised, double-blind, placebo controlled study was to examine the effects of β-alanine supplementation on aspects of muscular performance in highly-trained cyclists. Sixteen highly-trained cyclists (mean±SD; age=24±7yr; mass=70±7kg; VO2max=67±4mL.kg-1•min-1) supplemented with either β-alanine (n=8, 65mg.kg-1BM) or a placebo (n=8, dextrose monohydrate) over four weeks. Pre- and post-supplementation cyclists performed: 1) a four-minute maximal cycling test to measure average power and 2) 30 reciprocal maximal isokinetic knee contractions at a fixed angular velocity of 180°•sec-1 to measure average power/repetition, total work done (TWD) and fatigue index (%). Blood pH, lactate (La-) and bicarbonate (HCO₃-) concentrations were measured pre- and post-isokinetic testing at baseline and following the supplementation period. β-alanine supplementation was 44% likely to increase average power output during the four-minute cycling time-trial when compared to the placebo, although this was not statistically significant (p=0.25). Isokinetic average power/repetition was significantly increased post-β-alanine supplementation compared to placebo (β-alanine: 6.8±9.9W, placebo: -4.3±9.5W, p=0.04, 85% likely benefit), while fatigue index was significantly reduced (p=0.03, 95% likely benefit). TWD was 89% likely to be improved following β-alanine supplementation, however this was not statistically significant (p=0.09). There were no significant differences in blood pH, lactate and HCO₃- between groups (p>0.05). Four weeks of β-alanine supplementation resulted in worthwhile changes in time-trial performance and short-duration muscular force production in highly-trained cyclists.

Item Details

Item Type:Refereed Article
Keywords:Carnosine, Time-trial, Ergogenic, Supplement, Bicarbonate, Lactate
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Exercise Physiology
Objective Division:Health
Objective Group:Specific Population Health (excl. Indigenous Health)
Objective Field:Specific Population Health (excl. Indigenous Health) not elsewhere classified
Author:Howe, ST (Mr Sam Howe)
Author:Bellinger, PM (Mr Phillip Bellinger)
Author:Driller, MW (Dr Matthew Driller)
Author:Shing, CM (Dr Cecilia Kitic)
Author:Fell, JW (Associate Professor James Fell)
ID Code:84034
Year Published:2013
Web of Science® Times Cited:8
Deposited By:Health Sciences A
Deposited On:2013-04-14
Last Modified:2014-04-23
Downloads:0

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