The time to peak blood bicarbonate (HCO 3 – ), pH, and the strong ion difference (SID) following sodium bicarbonate (NaHCO 3 ) ingestion in highly trained adolescent swimmers

Newbury, Josh W. and Cole, Matthew and Kelly, Adam L. and Chessor, Richard J. and Sparks, S. Andy and McNaughton, Lars R. and Gough, Lewis A. (2021) The time to peak blood bicarbonate (HCO 3 – ), pH, and the strong ion difference (SID) following sodium bicarbonate (NaHCO 3 ) ingestion in highly trained adolescent swimmers. PLOS ONE, 16 (7). e0248456. ISSN 1932-6203

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Abstract

The timing of sodium bicarbonate (NaHCO3) supplementation has been suggested to be most optimal when coincided with a personal time that bicarbonate (HCO3–) or pH peaks in the blood following ingestion. However, the ergogenic mechanisms supporting this ingestion strategy are strongly contested. It is therefore plausible that NaHCO3 may be ergogenic by causing beneficial shifts in the strong ion difference (SID), though the time course of this blood acid base balance variable is yet to be investigated. Twelve highly trained, adolescent swimmers (age: 15.9 ± 1.0 years, body mass: 65.3 ± 9.6 kg) consumed their typical pre-competition nutrition 1–3 hours before ingesting 0.3 g∙kg BM-1 NaHCO3 in gelatine capsules. Capillary blood samples were then taken during seated rest on nine occasions (0, 60, 75, 90, 105, 120, 135, 150, 165 min post-ingestion) to identify the time course changes in HCO3–, pH, and the SID. No significant differences were found in the time to peak of each blood measure (HCO3–: 130 ± 35 min, pH: 120 ± 38 min, SID: 98 ± 37 min; p = 0.08); however, a large effect size was calculated between time to peak HCO3– and the SID (g = 0.88). Considering that a difference between time to peak blood HCO3– and the SID was identified in adolescents, future research should compare the ergogenic effects of these two individualized NaHCO3 ingestion strategies compared to a traditional, standardized approach.

Item Type:	Article
Additional Information:	** From PLOS via Jisc Publications Router ** History: collection 2021; received 25-02-2021; accepted 17-06-2021; epub 01-07-2021. ** Licence for this article: http://creativecommons.org/licenses/by/4.0/
Identification Number:	10.1371/journal.pone.0248456
Dates:	Date Event 17 June 2021 Accepted 1 July 2021 Published
Uncontrolled Keywords:	Research Article, Biology and life sciences, Medicine and health sciences, People and places, Physical sciences
Subjects:	CAH03 - biological and sport sciences > CAH03-01 - biosciences > CAH03-01-02 - biology (non-specific) CAH03 - biological and sport sciences > CAH03-02 - sport and exercise sciences > CAH03-02-01 - sport and exercise sciences
Divisions:	Faculty of Health, Education and Life Sciences > Centre for Life and Sport Sciences (C-LASS)
SWORD Depositor:	JISC PubRouter
Depositing User:	JISC PubRouter
Date Deposited:	21 Jul 2021 08:21
Last Modified:	08 Mar 2022 16:18
URI:	https://www.open-access.bcu.ac.uk/id/eprint/11877

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