Reduced Dose of Beta-Alanine Is Sufficient to Maintain Performance in Repeated Sprints.

Autor:	Zandona BA; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Curitiba, Brazil., Ramos RA; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Curitiba, Brazil., de Oliveira CDS; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Curitiba, Brazil., McAnulty SR; Department of Health and Exercise Science, Appalachian State University, Boone, North Carolina., Ferreira LHB; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Curitiba, Brazil.; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Irati, Brazil., Smolarek AC; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Curitiba, Brazil.; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Irati, Brazil., Enes AAN; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Curitiba, Brazil., Urbinati KMSS; Graduate Program in Health Technology, Pontifical Catholic University of Paraná, Curitiba, Brazil., Aragon AA; California State University, Northridge, California; and., Schoenfeld BJ; Department of Health Sciences, CUNY Lehman College, Bronkx, New York., de Souza Junior TP; Research Group on Metabolism, Nutrition and Strength Training, Federal University of Paraná, Curitiba, Brazil.; Department of Health and Exercise Science, Appalachian State University, Boone, North Carolina.
Jazyk:	angličtina
Zdroj:	Journal of strength and conditioning research [J Strength Cond Res] 2022 Jun 01; Vol. 36 (6), pp. 1636-1642. Date of Electronic Publication: 2020 Aug 21.
DOI:	10.1519/JSC.0000000000003715
Abstrakt:	Abstract: Zandona, BA, Ramos, RA, de Oliveira, CdS, McAnulty, SR, Ferreira, LHB, Smolarek, AC, Enes, AAN, Urbinati, KMdSS, Aragon, AA, Schoenfeld, BJ, and de Souza Junior, TP. Reduced Dose of Beta-Alanine Is Sufficient to Maintain Performance in Repeated Sprints. J Strength Cond Res 36(6): 1636-1642, 2022-Beta-alanine (BA) supplementation has been shown to be effective in improving physical performance by increasing carnosine concentration. However, it is still necessary to know the effect of a maintenance dose on performance. Thus, this study aimed to investigate the effects of a maintenance dose of BA supplementation on performance. Forty-four anaerobically trained men with 23.9 ± 3.8 years of age, 176.0 ± 0.05 cm height, 81.2 ± 7.5 kg body mass, and 15.5 ± 2.9% of body fat performed a cycle ergometer test consisting of 4 sprints of 30 s with 4 minutes of active recovery. The study comprised 3 phases: (a) presupplementation, (b) supplementation with 6.4 g·d-1 BA or placebo, and (c) postsupplementation with a maintenance dose of 1.2 g·d-1 of BA or interruption of supplementation. Data were analyzed using generalized estimated equations with a priori 0.05 level of significance. The placebo group and interruption group presented a lower power (7.28 ± 0.66 and 7.71 ± 0.42 W·kg-1 vs. 8.04 ± 0.84 and 9.25 ± 1.18 W·kg-1, respectively; p < 0.05) during the third sprint in postsupplementation, whereas the maintenance group maintained the required power (7.47 ± 1.03 vs. 8.74 ± 1.07 W·kg-1; p > 0.05). The placebo group also presented higher percentage of fatigue (44.5% ± 12.3 and 44.8% ± 7.7 vs. 37.6 ± 7.2%; p = 0.021) and higher subjective perception of exertion (8.92 ± 0.90 vs. 8.00 ± 1.60; p = 0.028). Therefore, the maintenance dose of 1.2 g·d-1 BA was effective in maintaining performance, whereas a reduction in performance was observed after supplementation interruption. (Copyright © 2020 National Strength and Conditioning Association.)
Databáze:	MEDLINE
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