Surrey Human Performance Institute, University of Surrey, Guildford GU2 7XH, United Kingdom.
Research Centre for Life and Sport Sciences (CLaSS), School of Health Sciences, Birmingham City University, Birmingham B15 3TN, United Kingdom.
Appl Physiol Nutr Metab. 2021 Sep;46(9):1111-1118. doi: 10.1139/apnm-2020-1120. Epub 2021 Mar 17.
This study investigated the effect of post-exercise sodium bicarbonate (NaHCO) ingestion on acid-base balance recovery and time-to-exhaustion (TTE) running performance. Eleven male runners (stature, 1.80 ± 0.05 m; body mass, 74.4 ± 6.5 kg; maximal oxygen consumption, 51.7 ± 5.4 mL·kg·min) participated in this randomised, single-blind, counterbalanced and crossover design study. Maximal running velocity (v-O) was identified from a graded exercise test. During experimental trials, participants repeated 100% v-O TTE protocols (TTE1, TTE2) separated by 40 min following the ingestion of either 0.3 g·kg body mass NaHCO (SB) or 0.03 g·kg body mass sodium chloride (PLA) at the start of TTE1 recovery. Acid-base balance (blood pH and bicarbonate, HCO) data were studied at baseline, post-TTE1, after 35 min recovery and post-TTE2. Blood pH and HCO concentration were unchanged at 35 min recovery ( > 0.05), but HCO concentration was elevated post-TTE2 for SB vs. PLA (+2.6 mmol·L; = 0.005; = 0.99). No significant differences were observed for TTE2 performance ( > 0.05), although a moderate effect size was present for SB vs. PLA (+14.3 s; = 0.56). Post-exercise NaHCO ingestion is not an effective strategy for accelerating the restoration of acid-base balance or improving subsequent TTE performance when limited recovery is available. Post-exercise sodium bicarbonate ingestion did not accelerate the restoration of blood pH or bicarbonate after 35 min. Performance enhancing effects of sodium bicarbonate ingestion may display a high degree of inter-individual variation. Small-to-moderate changes in performance were likely due to greater up-regulation of glycolytic activation during exercise.
这项研究调查了运动后碳酸氢钠（NaHCO）摄入对酸碱平衡恢复和力竭时间（TTE）跑步表现的影响。11 名男性跑步者（身高 1.80±0.05m；体重 74.4±6.5kg；最大摄氧量 51.7±5.4mL·kg·min）参加了这项随机、单盲、交叉设计研究。最大跑步速度（v-O）是从递增运动测试中确定的。在实验过程中，参与者在 TTE1 恢复期间，分别在服用 0.3g·kg 体重 NaHCO（SB）或 0.03g·kg 体重氯化钠（PLA）后，重复 100%v-O TTE 方案（TTE1、TTE2），两次之间间隔 40 分钟。在基线、TTE1 后、35 分钟恢复后和 TTE2 后研究酸碱平衡（血液 pH 和碳酸氢盐，HCO）数据。在 35 分钟恢复时，血液 pH 和 HCO 浓度没有变化（>0.05），但 SB 后 HCO 浓度在 TTE2 后升高与 PLA（+2.6mmol·L；=0.005；=0.99）。TTE2 表现无显著差异（>0.05），但 SB 与 PLA 之间存在中等效应大小（+14.3s；=0.56）。当恢复时间有限时，运动后碳酸氢钠摄入不是加速酸碱平衡恢复或提高随后 TTE 表现的有效策略。运动后 35 分钟，碳酸氢钠摄入不能加速血液 pH 或碳酸氢盐的恢复。碳酸氢钠摄入的增强性能效果可能表现出高度的个体间变异性。性能的小到中等变化可能是由于运动中糖酵解激活的更大上调所致。
