Gurton William H, Dabin Lilly, Marshall Steven
Sport & Physical Activity Research Centre, Health Research Institute, Sheffield Hallam University, Sheffield, United Kingdom.
Department of Service Sector Management, Sheffield Hallam University, Sheffield, United Kingdom.
Int J Sports Physiol Perform. 2024 Dec 20;20(2):224-231. doi: 10.1123/ijspp.2023-0535. Print 2025 Feb 1.
This study investigated the effect of an individualized sodium bicarbonate (SB) supplementation-timing strategy on 200-m and 400-m freestyle swimming time-trial (TT) performance.
Thirteen well-trained swimmers (8 men and 5 women; mean [SD] 22 [3] y, 1.76 [0.79] m, 73.4 [9.6] kg) had their time-to-peak bicarbonate (HCO3-) determined after ingestion of 0.3 g·kg-1 body mass SB in size 0 vegetarian capsules alongside a carbohydrate-high meal (1.5 g·kg-1 body mass). Following familiarization, participants performed 200-m and 400-m freestyle TTs after individualized timing (160 [36] min) of either SB or a placebo (PL; cornflour) on 4 separate occasions in a randomized, double-blind, crossover design. Completion times, blood lactate, and rating of perceived exertion (6-20 Borg) were measured.
SB did not improve completion times compared with PL during the 200-m (124.5 [7.3] vs 125.1 [6.2] s, P = .219, g = 0.09) or 400-m (263.4 [12.8] vs 264.7 [13.6] s; P = .192, g = 0.10) TTs. Blood lactate was elevated for SB compared with PL following the 200-m (12.99 [1.45] vs 10.98 [2.25] mmol·L-1; P = .042) and 400-m (13.05 [2.29] vs 10.44 [2.40] mmol·L-1; P = .017) TTs. SB reduced rating of perceived exertion after the TTs compared with PL (200 m: -0.9 [1.4] au, P = .033; 400 m: -1.2 [1.4] au, P = .012).
SB consumed in capsules at individualized time-to-peak [HCO3-] did not improve 200-m or 400-m freestyle-swimming TT performance and might not be a worthwhile SB ingestion strategy for well-trained swimmers.
本研究调查了个体化碳酸氢钠（SB）补充时间策略对200米和400米自由泳计时赛（TT）成绩的影响。
13名训练有素的游泳运动员（8名男性和5名女性；平均[标准差]22[3]岁，身高1.76[0.79]米，体重73.4[9.6]千克）在摄入0.3克·千克-1体重的SB（以0号素食胶囊形式）并搭配高碳水化合物餐（1.5克·千克-1体重）后，测定其达到碳酸氢根（HCO3-）峰值的时间。在熟悉流程后，参与者在4个不同场合按照个体化时间（160[36]分钟）随机、双盲、交叉设计服用SB或安慰剂（PL；玉米淀粉），之后进行200米和400米自由泳TT。测量完成时间、血乳酸和主观用力程度评分（6 - 20 Borg）。
在200米（124.5[7.3]秒对125.1[6.2]秒，P = 0.219，g = 0.09）或400米（263.4[12.8]秒对264.7[13.6]秒；P = 0.192，g = 0.10）TT中，与PL相比，SB并未改善完成时间。在200米（12.99[1.45]毫摩尔·升-1对10.98[2.25]毫摩尔·升-1；P = 0.042）和400米（13.05[2.29]毫摩尔·升-1对10.44[2.40]毫摩尔·升-1；P = 0.017）TT后，与PL相比，SB使血乳酸升高。与PL相比，SB在TT后降低了主观用力程度评分（200米：-0.9[1.4]au，P = 0.033；400米：-1.2[1.4]au，P = 0.012）。
在达到[HCO3-]峰值的个体化时间以胶囊形式服用SB并不能提高200米或400米自由泳TT成绩，对于训练有素的游泳运动员而言，这可能不是一种值得采用的SB摄入策略。
