Effects of post-exercise sodium bicarbonate ingestion on acid-base balance recovery and time-to-exhaustion running performance: a randomised crossover trial in recreational athletes

Gurton, William and Macrae, Heather Z. and Gough, Lewis A and King, David George (2021) Effects of post-exercise sodium bicarbonate ingestion on acid-base balance recovery and time-to-exhaustion running performance: a randomised crossover trial in recreational athletes. Applied Physiology, Nutrition, and Metabolism. ISSN 1715-5320

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Abstract

This study investigated the effect of post-exercise sodium bicarbonate (NaHCO3) 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-1.min-1) participated in this randomised, single-blind, counterbalanced and crossover design study. Maximal running velocity (v-VO2max) was identified from a graded exercise test. During experimental trials, participants repeated 100% v-VO2max TTE protocols (TTE1, TTE2) separated by 40 min following the ingestion of either 0.3 g.kg-1 BM NaHCO3 (SB) or 0.03 g.kg-1 BM sodium chloride (PLA) at the start of TTE1 recovery. Acid-base balance (blood pH and bicarbonate, HCO3-) data were studied at baseline, post-TTE1, after 35 min recovery and post-TTE2. Blood pH and [HCO3-] were unchanged at 35 min recovery (p > 0.05), but [HCO3-] was elevated post-TTE2 for SB vs. PLA (+2.6 mmol.l-1; p = 0.005; g = 0.99). No significant differences were observed for TTE2 performance (p > 0.05), although a moderate effect size was present for SB vs. PLA (+14.3 s; g = 0.56). Post-exercise NaHCO3 ingestion is not an effective strategy for accelerating the restoration of acid-base balance or improving subsequent TTE performance when limited recovery is available.
 Novelty bullets:
 •Post-exercise sodium bicarbonate ingestion did not accelerate the restoration of blood pH or bicarbonate after 35 minutes
 •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
 

Item Type: Article
Additional Information: ** From Crossref journal articles via Jisc Publications Router ** History: epub 17-03-2021; issued 17-03-2021.
Identification Number: https://doi.org/10.1139/apnm-2020-1120
Date: 17 March 2021
Uncontrolled Keywords: Nutrition and Dietetics, Physiology (medical), Physiology, Endocrinology, Diabetes and Metabolism, General Medicine
Subjects: C600 Sports Science
Divisions: Faculty of Health, Education and Life Sciences > Centre for Life and Sport Sciences (C-LASS)
SWORD Depositor: JISC PubRouter
Depositing User: Lewis Gough
Date Deposited: 12 Apr 2021 10:37
Last Modified: 12 Apr 2021 10:37
URI: http://www.open-access.bcu.ac.uk/id/eprint/11450

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