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β-alanine supplementation to improve exercise capacity and performance: a systematic review and meta-analysis.

Saunders, Bryan; Elliott-Sale, Kirsty; Artioli, Guilherme G.; Swinton, Paul A.; Dolan, Eimear; Roschel, Hamilton; Sale, Craig; Gualano, Bruno

Authors

Bryan Saunders

Kirsty Elliott-Sale

Guilherme G. Artioli

Paul A. Swinton

Eimear Dolan

Hamilton Roschel

Craig Sale

Bruno Gualano



Abstract

Objective - To conduct a systematic review and meta-analysis of the evidence on the effects of {esc}gb{esc}s-alanine supplementation on exercise capacity and performance. Design - This study was designed in accordance with PRISMA guidelines. A 3-level mixed effects model was employed to model effect sizes and account for dependencies within data. Data sources - 3 databases (PubMed, Google Scholar, Web of Science) were searched using a number of terms ('{esc}gb{esc}s-alanine' and 'Beta-alanine' combined with 'supplementation', 'exercise', 'training', 'athlete', 'performance' and 'carnosine'). Eligibility criteria for selecting studies - Inclusion/exclusion criteria limited articles to double-blinded, placebo-controlled studies investigating the effects of {esc}gb{esc}s-alanine supplementation on an exercise measure. All healthy participant populations were considered, while supplementation protocols were restricted to chronic ingestion. Cross-over designs were excluded due to the long washout period for skeletal muscle carnosine following supplementation. A single outcome measure was extracted for each exercise protocol and converted to effect sizes for meta-analyses. Results - 40 individual studies employing 65 different exercise protocols and totalling 70 exercise measures in 1461 participants were included in the analyses. A significant overall effect size of 0.18 (95% CI 0.08 to 0.28) was shown. Meta-regression demonstrated that exercise duration significantly (p=0.004) moderated effect sizes. Subgroup analyses also identified the type of exercise as a significant (p=0.013) moderator of effect sizes within an exercise time frame of 0.5-10?min with greater effect sizes for exercise capacity (0.4998 (95% CI 0.246 to 0.753)) versus performance (0.1078 (95% CI 0.201 to 0.416)). There was no moderating effect of training status (p=0.559), intermittent or continuous exercise (p=0.436) or total amount of {esc}gb{esc}s-alanine ingested (p=0.438). Co-supplementation with sodium bicarbonate resulted in the largest effect size when compared with placebo (0.43 (95% CI 0.22 to 0.64)). Summary/conclusions - {esc}gb{esc}s-alanine had a significant overall effect while subgroup analyses revealed a number of modifying factors. These data allow individuals to make informed decisions as to the likelihood of an ergogenic effect with {esc}gb{esc}s-alanine supplementation based on their chosen exercise modality.

Journal Article Type Article
Publication Date Apr 1, 2017
Journal British journal of sports medicine
Print ISSN 0306-3674
Electronic ISSN 1473-0480
Publisher BMJ Publishing Group
Peer Reviewed Peer Reviewed
Volume 51
Issue 8
Pages 658-669
Institution Citation SAUNDERS, B., ELLIOTT-SALE, K., ARTIOLI, G.G., SWINTON, P.A., DOLAN, E., ROSCHEL, H., SALE, C. and GUALANO, B. 2017. ß-alanine supplementation to improve exercise capacity and performance: a systematic review and meta-analysis. British journal of sports medicine [online], 51(8), pages 658-669. Available from: https://doi.org/10.1136/bjsports-2016-096396
DOI https://doi.org/10.1136/bjsports-2016-096396
Keywords Beta alanine supplementation; Muscle carnosine; Exercise capacity; Exercise performance; Acidosis; Buffering capacity; Sodium bicarbonate; Cosupplementation

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