a Martial Arts and Combat Sports Research Group, School of Physical and Education and Sport , University of São Paulo , São Paulo , Brazil.
b Musculoskeletal Physiology Research Group, Sport, Health and Performance Enhancement (SHAPE) Research Centre, School of Science and Technology , Nottingham Trent University , Nottingham , UK.
Eur J Sport Sci. 2018 Apr;18(3):431-440. doi: 10.1080/17461391.2018.1424942. Epub 2018 Jan 20.
To investigate the effect of sodium bicarbonate (NaHCO) on performance and estimated energy system contribution during simulated taekwondo combat.
Nine taekwondo athletes completed two experimental sessions separated by at least 48 h. Athletes consumed 300 mg/kg body mass of NaHCO or placebo (CaCO) 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), ATP (adenosine triphosphate)-phosphocreatine (PCr) (W), and glycolytic (W) systems were calculated during the combat simulation.
[La] increased significantly after NaHCO ingestion, when compared with the placebo condition (+14%, P = 0.04, d = 3.70). NaHCO 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 NaHCO when compared with placebo (+13%, P = 0.05, d = 1.15). W, W, VO, HR and RPE were not different between conditions (P > 0.05).
NaHCO ingestion was able to increase the contribution of glycolytic metabolism and, therefore, improve performance during simulated taekwondo combat.
研究碳酸氢钠（NaHCO）对模拟跆拳道对抗中运动表现和估计能量系统贡献的影响。
9 名跆拳道运动员在至少 48 小时的时间内完成了两次实验。运动员在模拟战斗（三轮 2 分钟，每轮之间休息 1 分钟）前 90 分钟以双盲、随机、重复测量交叉设计的方式分别服用 300mg/kg 体重的 NaHCO 或安慰剂（CaCO）。所有模拟战斗都被拍摄下来，以量化每轮战斗的时间。在每轮比赛前后测量血乳酸浓度[La]和感知用力等级（RPE），而在战斗模拟期间计算心率（HR）和氧化（W）、三磷酸腺苷（ATP）-磷酸肌酸（PCr）（W）和糖酵解（W）系统的估计贡献。
与安慰剂相比，NaHCO 摄入后[La]显著增加（增加 14%，P=0.04，d=3.70）。与安慰剂相比，NaHCO 摄入使第一轮的估计糖酵解能量贡献增加了 31%（P=0.01，d=3.48）。与安慰剂相比，NaHCO 摄入后的总攻击时间显著增加（增加 13%，P=0.05，d=1.15）。W、W、VO、HR 和 RPE 在两种情况下没有差异（P>0.05）。
NaHCO 摄入能够增加糖酵解代谢的贡献，从而提高模拟跆拳道对抗中的运动表现。
