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REVIEW  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2017 September;57(9):1132-41

DOI: 10.23736/S0022-4707.16.06582-8

Copyright © 2016 EDIZIONI MINERVA MEDICA

lingua: Inglese

Effects of beta-alanine supplementation on performance and muscle fatigue in athletes and non-athletes of different sports: a systematic review

Priscila BERTI ZANELLA 1, Fernanda DONNER ALVES 2, Carolina GUERINI de SOUZA 1, 3

1 Center for Studies in Food and Nutrition (CESAN), Porto Alegre General Hospital (HCPA), Porto Alegre, Brazil; 2 Centro Universitário Ritter dos Reis, UniRitter, Porto Alegre, Brazil; 3 Department of Nutrition, Rio Grande do Sul Federal University (UFRGS), Porto Alegre, Brazil


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INTRODUCTION: Beta-alanine (BA) is a non-essential amino acid that can be synthesized in the liver and obtained from diet, particularly from white and red meat. Increased availability of BA via dietary supplement, may improve performance of athletes. The aim of this study was to conduct a review of the use of BA supplementation as an ergogenic aid to improve performance and fatigue resistance in athletes and non-athletes.
EVIDENCE ACQUISITION: In this systematic review, a search in PubMed and Bireme databases was performed for the terms “beta-alanine,” “beta-alanine and exercise,” “carnosine” or “carnosine and exercise” in the titles or abstracts. We included randomized, clinical trials published between 2005 and 2015.
EVIDENCE SYNTHESIS: Twenty-three studies were selected. Most of them included physically active individuals. The mean intervention period was 5.2±1.8 weeks, and mean BA dose was 4.8±1.3 g/day. The main outcome measures were blood lactate, pH, perceived exertion, power and physical working capacity at fatigue threshold. After BA supplementation, no statistically significant difference was observed in total work, exercise performance time, oxygen consumption and time to exhaustion.
CONCLUSIONS: BA supplementation seems to improve perceived exertion and biochemical parameters related to muscle fatigue and less evidence was found for improvement in performance.


KEY WORDS: Beta-alanine - Carnosine - Dietary supplement - Muscle fatigue - Athletic performance - Oxygen consumption

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