Beta-alanine supplementation improves isometric, but not isotonic or isokinetic strength endurance in recreationally strength-trained young men

Bassinello, D., de Salles Painelli, V., Dolan, E., Lixandrão, M., Cajueiro, M., de Capitani, M., Saunders, B., Sale, C. ORCID: 0000-0002-5816-4169, Artioli, G.G. ORCID: 0000-0001-8463-2213, Gualano, B. and Roschel, H., 2018. Beta-alanine supplementation improves isometric, but not isotonic or isokinetic strength endurance in recreationally strength-trained young men. Amino Acids. ISSN 0939-4451

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Abstract

Background: β-alanine (BA) supplementation may be ergogenic during high intensity exercise, primarily due to the buffering of hydrogen cations, although the effects of beta-alanine supplementationon strength endurance are equivocal.
Aim: To determine the effects of 4 weeks of beta-alanine supplementation on skeletal muscle endurance using a battery of performance tests.
Methods: This study employed a parallel group, repeated measures, randomised, double-blinded and placebo controlled design. Twenty recreationally strength-trained healthy males completed tests of isotonic strength endurance (repeated bench and leg press), along with tests of isometric and isokinetic endurance conducted using an isokinetic dynamometer. Tests were performed before and after a 4 week intervention, comprising an intake of 6.4g.day-1 10 of BA (n = 9) or placebo (maltodextrin, n = 11).
Results: Time-to-exhaustion during the isometric endurance test improved by ~17% in the BA group (p < 0.01), while PL remained unchanged. No significant within-group differences (p > 0.1) were shown for any of the performance variables in the isokinetic test (peak torque, fatigue index, total work) nor for the total number of repetitions performed in the isotonic endurance tests (leg or bench press).
Conclusions: Four weeks of BA supplementation (6.4 g.day-1 15 ) improved isometric, but not isokinetic or isotonic endurance performance.

Item Type:	Journal article
Publication Title:	Amino Acids
Creators:	Bassinello, D., de Salles Painelli, V., Dolan, E., Lixandrão, M., Cajueiro, M., de Capitani, M., Saunders, B., Sale, C., Artioli, G.G., Gualano, B. and Roschel, H.
Publisher:	Springer Vienna
Date:	15 June 2018
ISSN:	0939-4451
Identifiers:	Number Type 10.1007/s00726-018-2593-8 DOI
Divisions:	Schools > School of Science and Technology
Record created by:	Jill Tomkinson
Date Added:	18 Jun 2018 15:09
Last Modified:	15 Jun 2019 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/33866

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