The effects of sodium bicarbonate supplementation at individual time-to-peak blood bicarbonate on 4-km cycling time trial performance in the heat.

Journal article


Gough, Lewis A, Williams, Jake J, Newbury, Josh W and Gurton, William H 2021. The effects of sodium bicarbonate supplementation at individual time-to-peak blood bicarbonate on 4-km cycling time trial performance in the heat. European Journal of Sport Science. 22 (2). https://doi.org/10.1080/17461391.2021.1998644
AuthorsGough, Lewis A, Williams, Jake J, Newbury, Josh W and Gurton, William H
AbstractThe purpose of this study was to explore the effect of individualised sodium bicarbonate (NaHCO ) supplementation according to a pre-established individual time-to-peak (TTP) blood bicarbonate (HCO ) on 4-km cycling time trial (TT) performance in the heat. Eleven recreationally trained male cyclists (age: 28 ± 6 years, height: 180 ± 6 cm, body mass: 80.5 ± 8.4 kg) volunteered for this study in a randomised, crossover, triple-blind, placebo-controlled design. An initial visit was conducted to determine TTP HCO following 0.2 g.kg body mass (BM) NaHCO ingestion. Subsequently, on three separate occasions, participants completed a 4-km cycling TT in the heat (30 degrees centigrade; °C) (relative humidity ∼40%) following ingestion of either NaHCO (0.2 g.kg body mass), a sodium chloride placebo (0.2 g.kg BM; PLA) or no supplementation (control; CON) at the predetermined individual TTP HCO . Absolute peak [HCO ] prior to the 4-km cycling TT's was elevated for NaHCO compared to PLA (+2.8 mmol.l ;  = 0.002;  = 2.2) and CON (+2.5 mmol.l ;  < 0.001;  = 2.1). Completion time following NaHCO was 5.6 ± 3.2 s faster than PLA (1.6%; CI: 2.8, 8.3;  = 0.001;  = 0.2) and 4.7 ± 2.8 s faster than CON (1.3%; CI: 2.3, 7.1;  = 0.001;  = 0.2). These results demonstrate that NaHCO ingestion at a pre-established individual TTP HCO improves 4-km cycling TT performance in the heat, likely through enhancing buffering capacity.
KeywordsAlkalosis; Environmental physiology; Buffering; Supplements; Track cycling
Year2021
JournalEuropean Journal of Sport Science
Journal citation22 (2)
PublisherTaylor & Francis
ISSN1536-7290
Digital Object Identifier (DOI)https://doi.org/10.1080/17461391.2021.1998644
Official URLhttps://www.tandfonline.com/doi/full/10.1080/17461391.2021.1998644
Publication dates
Online21 Nov 2021
Publication process dates
Accepted27 Oct 2021
Deposited08 Dec 2022
Accepted author manuscript
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Output statusPublished
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https://repository.canterbury.ac.uk/item/8z81z/the-effects-of-sodium-bicarbonate-supplementation-at-individual-time-to-peak-blood-bicarbonate-on-4-km-cycling-time-trial-performance-in-the-heat

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Accepted author manuscript
bicarb and heat_final (V2).pdf
License: CC BY-NC-ND 4.0

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