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Eur J Sport Sci. 2018 Apr;18(3):431-440. doi: 10.1080/17461391.2018.1424942. Epub 2018 Jan 20.

Sodium bicarbonate ingestion increases glycolytic contribution and improves performance during simulated taekwondo combat.

Author information

1
a Martial Arts and Combat Sports Research Group, School of Physical and Education and Sport , University of São Paulo , São Paulo , Brazil.
2
b Musculoskeletal Physiology Research Group, Sport, Health and Performance Enhancement (SHAPE) Research Centre, School of Science and Technology , Nottingham Trent University , Nottingham , UK.
3
c NAR-Nucleus of High Performance in Sport , São Paulo , Brazil.
4
d Centre for Exercise and Sport Science Research, School of Medical & Health Science , Edith Cowan University , Joondalup , Australia.

Abstract

PURPOSE:

To investigate the effect of sodium bicarbonate (NaHCO3) on performance and estimated energy system contribution during simulated taekwondo combat.

METHODS:

Nine taekwondo athletes completed two experimental sessions separated by at least 48 h. Athletes consumed 300 mg/kg body mass of NaHCO3 or placebo (CaCO3) 90 min before the combat simulation (three rounds of 2 min separated by 1 min passive recovery), in a double-blind, randomized, repeated-measures crossover design. All simulated combat was filmed to quantify the time spent fighting in each round. Lactate concentration [La-] and rating of perceived exertion (RPE) were measured before and after each round, whereas heart rate (HR) and the estimated contribution of the oxidative (WOXI), ATP (adenosine triphosphate)-phosphocreatine (PCr) (WPCR), and glycolytic (W[La-]) systems were calculated during the combat simulation.

RESULTS:

[La-] increased significantly after NaHCO3 ingestion, when compared with the placebo condition (+14%, P = 0.04, d = 3.70). NaHCO3 ingestion resulted in greater estimated glycolytic energy contribution in the first round when compared with the placebo condition (+31%, P = 0.01, d = 3.48). Total attack time was significantly greater after NaHCO3 when compared with placebo (+13%, P = 0.05, d = 1.15). WOXI, WPCR, VO2, HR and RPE were not different between conditions (P > 0.05).

CONCLUSION:

NaHCO3 ingestion was able to increase the contribution of glycolytic metabolism and, therefore, improve performance during simulated taekwondo combat.

KEYWORDS:

Alkalosis; energy system; taekwondo; time–motion and sports performance

PMID:
29355092
DOI:
10.1080/17461391.2018.1424942
[Indexed for MEDLINE]

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