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J Sci Med Sport. 2017 Apr;20(4):403-408. doi: 10.1016/j.jsams.2016.08.014. Epub 2016 Aug 26.

Beta-alanine supplementation enhances judo-related performance in highly-trained athletes.

Author information

1
Laboratory of Applied Nutrition and Metabolism, School of Physical Education and Sport, University of São Paulo, Brazil.
2
Laboratory of Applied Nutrition and Metabolism, School of Physical Education and Sport, University of São Paulo, Brazil. Electronic address: vitor.painelli@usp.br.
3
Combat Sports and Martial Arts Research Group, School of Physical Education and Sport, University of São Paulo, Brazil.
4
Laboratory of Physiology and Sport Performance (LAFIDE), Faculty of Sciences, Paulista State University, Brazil.

Abstract

OBJECTIVES:

In official judo competitions, athletes usually engage in 5-7 matches in the same day, performing numerous high-intensity efforts interspersed by short recovery intervals. Thus, glycolytic demand in judo is high and acidosis may limit performance. Carnosine is a relevant intracellular acid buffer whose content is increased with beta-alanine supplementation. Thus, we hypothesized that beta-alanine supplementation could attenuate acidosis and improve judo performance.

DESIGN:

Twenty-three highly-trained judo athletes were randomly assigned to receive either beta-alanine (6.4gday-1) or placebo (dextrose, same dosage) for 4 weeks.

METHODS:

Performance was assessed before (PRE) and after (POST) supplementation through a 5-min simulated fight (randori) followed by 3 bouts of the Special Judo Fitness Test (SJFT). Blood samples were collected for blood pH, bicarbonate (HCO3-) and lactate determination.

RESULTS:

Beta-alanine supplementation improved the number of throws per set and the total number of throws (both p<0.05). Placebo did not change these variables (both p>0.05). Blood pH and HCO3- reduced after exercise (all p<0.001), with no between-group differences (all p>0.05). However, the lactate response to exercise increased in the beta-alanine group as compared to placebo (p<0.05).

CONCLUSIONS:

In conclusion, 4 weeks of beta-alanine supplementation effectively enhance judo-related performance in highly-trained athletes.

KEYWORDS:

Athletes; Buffers; Carnosine; Dietary supplement

PMID:
27601217
DOI:
10.1016/j.jsams.2016.08.014
[Indexed for MEDLINE]

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