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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]
Copyright 2013 Human Kinetics, Inc.
Official URL: http://journals.humankinetics.com/ijsnem-current-i...
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 Type:||Refereed Article|
|Keywords:||Carnosine, Time-trial, Ergogenic, Supplement, Bicarbonate, Lactate|
|Research Division:||Health Sciences|
|Research Group:||Sports science and exercise|
|Research Field:||Exercise physiology|
|Objective Group:||Specific population health (excl. Indigenous health)|
|Objective Field:||Specific population health (excl. Indigenous health) not elsewhere classified|
|UTAS Author:||Howe, ST (Mr Sam Howe)|
|UTAS Author:||Bellinger, PM (Mr Phillip Bellinger)|
|UTAS Author:||Driller, MW (Dr Matthew Driller)|
|UTAS Author:||Shing, CM (Dr Cecilia Kitic)|
|UTAS Author:||Fell, JW (Associate Professor James Fell)|
|Web of Science® Times Cited:||24|
|Deposited By:||Health Sciences A|
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