a Sport and Physical Activity Department, Faculty of Health and Life Sciences , Birmingham City University , Birmingham , UK.
b Sports Nutrition and Performance Group, Department of Sport and Physical Activity , Edge Hill University , Ormskirk , UK.
J Sports Sci. 2019 Jul;37(13):1464-1471. doi: 10.1080/02640414.2019.1568173. Epub 2019 Jan 22.
This study investigated the effects of two separate doses of sodium bicarbonate (NaHCO) on 4 km time trial (TT) cycling performance and post-exercise acid base balance recovery in hypoxia. Fourteen club-level cyclists completed four cycling TT's, followed by a 40 min passive recovery in normobaric hypoxic conditions (FiO = 14.5%) following one of either: two doses of NaHCO (0.2 g.kg BM; SBC2, or 0.3 g.kg BM; SBC3), a taste-matched placebo (0.07 g.kg BM sodium chloride; PLA), or a control trial in a double-blind, randomized, repeated-measures and crossover design study. Compared to PLA, TT performance was improved following SBC2 (p = 0.04, = 0.16, very likely beneficial), but was improved to a greater extent following SBC3 (p = 0.01, = 0.24, very likely beneficial). Furthermore, a likely benefit of ingesting SBC3 over SBC2 was observed (p = 0.13, 0.10), although there was a large inter-individual variation. Both SBC treatments achieved full recovery within 40 min, which was not observed in either PLA or CON following the TT. In conclusion, NaHCO improves 4 km TT performance and acid base balance recovery in acute moderate hypoxic conditions, however the optimal dose warrants an individual approach.
这项研究调查了两种不同剂量的碳酸氢钠（NaHCO）对 4 公里计时赛（TT）骑行表现和低氧环境下运动后酸碱平衡恢复的影响。14 名俱乐部级自行车手完成了 4 次 TT，随后在常压低氧条件下进行 40 分钟的被动恢复（FiO = 14.5%），以下是其中之一：两种剂量的 NaHCO（0.2 g.kg BM；SBC2 或 0.3 g.kg BM；SBC3）、口感匹配的安慰剂（0.07 g.kg BM 氯化钠；PLA）或在双盲、随机、重复测量和交叉设计研究中进行对照试验。与 PLA 相比，SBC2 后 TT 表现有所提高（p = 0.04， = 0.16，非常可能有益），但 SBC3 后提高更为明显（p = 0.01， = 0.24，非常可能有益）。此外，观察到摄入 SBC3 比 SBC2 有更大的好处（p = 0.13， 0.10），尽管个体间存在较大差异。两种 SBC 处理均在 40 分钟内完全恢复，而在 TT 后 PLA 或 CON 中均未观察到。总之，NaHCO 可改善急性中度低氧条件下的 4 公里 TT 表现和酸碱平衡恢复，但最佳剂量需要个体化方法。
