Effects of oral lactate supplementation on acid–base balance and prolonged high-intensity interval cycling performance

Bordoli, C ORCID: https://orcid.org/0000-0002-9824-1851, Varley, I ORCID: https://orcid.org/0000-0002-3607-8921, Sharpe, GR ORCID: https://orcid.org/0000-0002-4575-2332, Johnson, MA ORCID: https://orcid.org/0000-0002-8226-9438 and Hennis, PJ ORCID: https://orcid.org/0000-0002-8216-998X, 2024. Effects of oral lactate supplementation on acid–base balance and prolonged high-intensity interval cycling performance. Journal of Functional Morphology and Kinesiology, 9 (3): 139. ISSN 2411-5142

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Abstract

Lactate is an important energy intermediate and metabolic buffer, and may be ergogenic. We investigated if lactate supplementation is an effective approach to enhance the exercise performance and acid–base balance of trained cyclists during exercise devised to simulate the demands of endurance road race cycling. Sixteen endurance-trained male cyclists (V·O2max 59 ± 7 mL·kg−1·min−1) consumed 120 mg·kg−1 body mass of lactate or a placebo 70 min prior to performing an exercise performance test, comprising five repeated blocks consisting of 1 km and 4 km time trials interspersed with 10 min of moderate-intensity exercise. Blood acid–base balance (including [H+] and [HCO3−]), heart rate, perceived exertion, and gastro-intestinal tolerance were assessed. There was no effect of lactate supplementation on exercise performance (p = 0.320), despite a reduction in RPE (p = 0.012) and increases in [SID] (p = 0.026) and [HCO3−] (p = 0.041). In addition, gastro-intestinal side effects were observed, but there was no effect on heart rate. Lactate supplementation did not improve exercise performance, despite positive changes in acid–base balance and RPE. This suggests that the alkalising effects of the supplement can reduce perceived effort, but these benefits do not translate into performance improvements.

Item Type:	Journal article
Publication Title:	Journal of Functional Morphology and Kinesiology
Creators:	Bordoli, C., Varley, I., Sharpe, G.R., Johnson, M.A. and Hennis, P.J.
Publisher:	MDPI
Date:	20 August 2024
Volume:	9
Number:	3
ISSN:	2411-5142
Identifiers:	Number Type 10.3390/jfmk9030139 DOI 2202108 Other
Rights:	This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	28 Aug 2024 09:19
Last Modified:	28 Aug 2024 09:19
URI:	https://irep.ntu.ac.uk/id/eprint/52109

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