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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of beta-alanine supplementation during high-intensity interval training on repeated sprint ability performance and neuromuscular fatigue

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Milioni, Fabio [1] ; Bonetti de Poli, Rodrigo Araujo [1] ; Saunders, Bryan [2, 3] ; Gualano, Bruno [2] ; da Rocha, Alisson L. [4] ; Ramos da Silva, Adelino Sanchez [4] ; Guerrero Muller, Paulo de Tarso [5] ; Zagatto, Alessandro Moura [1, 6]
Total Authors: 8
[1] Sao Paulo State Univ, Lab Physiol & Human Performance, Post Grad Program Human Movement Sci, Bauru, SP - Brazil
[2] Univ Sao Paulo, Fac Med, Sch Phys Educ & Sport, Rheumatol Div, Appl Physiol & Nutr Res Grp, Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Fac Med, Inst Orthopaed & Traumatol, Ribeirao Preto, SP - Brazil
[4] Univ Sao Paulo, Sch Phys Educ & Sports Ribeirao Preto, Ribeirao Preto, SP - Brazil
[5] Mato Grosso do Sul Fed Univ, Lab Resp Pathophysiol, Sao Paulo, SP - Brazil
[6] Sao Paulo State Univ, Fac Sci, Dept Phys Educ, Bauru, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: Journal of Applied Physiology; v. 127, n. 6, p. 1599-1610, DEC 2019.
Web of Science Citations: 1

The study investigated the influence of beta-alanine supplementation during a high-intensity interval training (HIIT) program on repeated sprint ability (RSA) performance. This study was randomized, double-blinded, and placebo controlled. Eighteen men performed an incremental running test until exhaustion (T-INC) at baseline and followed by 4-wk HIIT (10 x 1min runs 90% maximal T-INC velocity {[}1-min recovery]). Then, participants were randomized into two groups and performed a 6-wk HIIT associated with supplementation of 6.4 g/day of beta-alanine (G beta) or dextrose (placebo group; GP). Pre- and post-6-wk HIIT + supplementation, participants performed the following tests: 1) T-INC; 2) supramaximal running test; and 3) 2 x 6 x 35-m sprints (RSA). Before and immediately after RSA, neuromuscular function was assessed by vertical jumps, maximal isometric voluntary contractions of knee extension, and neuromuscular electrical stimulations. Muscle biopsies were performed to determine muscle carnosine content, muscle buffering capacity in vitro (beta m(in) (vitro)), and content of phos-phofructokinase (PFK), monocarboxylate transporter 4 (MCT4), and hypoxia-inducible factor-1 alpha (HIF-1 alpha). Both groups showed a significant time effect for maximal oxygen uptake (G beta: 6.2 +/- 3.6% and GP: 6.5 +/- 4.2%; P > 0.01); only G beta showed a time effect for total (-3.0 +/- 2.0%; P > 0.001) and best (-3.3 +/- 3.0%; P = 0.03) RSA times. A group-by-time interaction was shown after HIIT + Supplementation for muscle carnosine (G beta: 34.4 +/- 2.3 and GP: 20.7 +/- 3.0 dm(-1); P = 0.003) and neuromuscular voluntary activation after RSA (G beta: 87.2 +/- 3.3% and GP: 78.9 +/- 12.4%; P = 0.02). No time effect or group-by-time interaction was shown for supramaximal running test performance, beta m, and content of PFK, MCT4, and HIF-1 alpha. In summary, beta-alanine supplementation during HIIT increased muscle carnosine and attenuated neuromuscular fatigue, which may contribute to an enhancement of RSA performance. NEW \& NOTEWORTHY beta-Alanine supplementation during a high-intensity interval training program increased repeated sprint performance. The improvement of muscle carnosine content induced by beta-alanine supplementation may have contributed to an attenuation of central fatigue during repeated sprint. Overall, beta-alanine supplementation may be a useful dietary intervention to prevent fatigue. (AU)

FAPESP's process: 16/11076-6 - ²-alanine supplementation associated to high-intensity interval training on performance and central and peripheral fatigue processes during repeated sprints
Grantee:Alessandro Moura Zagatto
Support Opportunities: Regular Research Grants
FAPESP's process: 16/50438-0 - Nutritional suplementation and exercise to optimize exercise performance: focus on individual responses and a step towards personalized sports nutrition
Grantee:Bryan Saunders
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 16/17836-2 - Effects of neuromuscular post activation induced by jumps in anaerobic capacity in cycle
Grantee:Rodrigo de Araujo Bonetti de Poli
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 16/02683-6 - Influence of beta-alanine supplementation associated with high-intensity interval training on performance of repeated sprints.
Grantee:Fabio Milioni
Support Opportunities: Scholarships in Brazil - Doctorate