Sodium bicarbonate ingestion increases glycolytic contribution and improves performance during simulated taekwondo combat. Issue 3 (16th March 2018)

• Record Type: Journal Article
• Authors: Lopes-Silva, João Paulo; Da Silva Santos, Jonatas Ferreira; Artioli, Guilherme Giannini; Loturco, Irineu; Abbiss, Chris; Franchini, Emerson
• Is Part Of: European journal of sport science. Volume 18:Issue 3(2018)
• Page Start: 431
• Page End: 440
• Publication Date: 2018-03-16
• Subjects: Alkalosis -- taekwondo -- energy system -- time–motion and sports performance; Sports sciences -- Periodicals; Sports Medicine -- Periodicals; Exercise -- Periodicals; Sports -- Periodicals; 612
• DOI: 10.1080/17461391.2018.1424942
• Languages: English
• ISSNs: 1746-1391

Abstract

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 ( W OXI ), ATP (adenosine triphosphate)-phosphocreatine (PCr) ( W PCR ), 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). W OXI, W PCR, 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.