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


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]

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Copyright 2013 Human Kinetics, Inc.

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DOI: doi:10.1123/ijsnem.23.6.562


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±•min-1) supplemented with either β-alanine (n=8, 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:11
Deposited By:Health Sciences A
Deposited On:2013-04-14
Last Modified:2017-11-01

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