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European Journal of Sport Science - 2025 - Aggett - Acute Effects of Caffeine and Taurine Co‐Ingestion on Time to1.13 MB
Published VersionCC BY V4.0, Open Access
Journal article
Acute Effects of Caffeine and Taurine Co-Ingestion on Time to Exhaustion and Thermoregulatory Responses to Cycling in the Heat
European Journal of Sport Science, Vol.25(10), pp.1-12
2025
PMID: 40956767
Abstract
Caffeine and taurine are commonly co-ingested pre-exercise but elicit different thermoregulatory responses; however, their combined effect on thermoregulation is unknown. Therefore, we evaluated the effects of oral caffeine and taurine co-ingestion on time to exhaustion (TTE) and thermoregulatory responses to cycling in the heat at the gas exchange threshold (GET). Ten healthy nonheat acclimated participants took part in a double-blind crossover study, completing a TTE in the heat (35°C; 40% relative humidity), cycling at a power output associated with the GET and 1 h after ingesting: caffeine (5 mg/kg) and taurine (50 mg/kg) combined or placebo. Pulmonary gas exchange, core and mean skin temperatures and whole-body sweat rate (WBSR) were recorded throughout. Heat production was determined using partitional calorimetry. There were no differences in TTE between conditions (p = 0.608); however, the rate of oxygen consumption (p = 0.017), minute ventilation (p = 0.029) and heat production (p = 0.019) were higher following the supplement. There were no differences between conditions for skin (p = 0.539) and core temperature (p = 0.699), mean skin blood flow (p = 0.119), respiratory exchange ratio (p = 0.546) and WBSR (p = 0.897). Pre-exercise co-ingestion of caffeine and taurine in the heat had no ergogenic effect despite increasing the ventilatory and metabolic demand. Collectively, these data indicate minimal effects on whole-body thermoregulation.
Details
- Title
- Acute Effects of Caffeine and Taurine Co-Ingestion on Time to Exhaustion and Thermoregulatory Responses to Cycling in the Heat
- Authors
- James Aggett (Corresponding Author) - Swansea UniversityJoe Page - Swansea UniversityJenny Peel - Swansea UniversityKevin John - University of CanberraGuilherme Matta - Swansea UniversityJamie Tallent - University of EssexShane Heffernan - Swansea UniversityOwen Jeffries - Newcastle UniversityMark Waldron - University of the Sunshine Coast, Queensland, School of Health
- Publication details
- European Journal of Sport Science, Vol.25(10), pp.1-12
- Publisher
- John Wiley & Sons Ltd.
- Date published
- 2025
- DOI
- 10.1002/ejsc.70044
- ISSN
- 1536-7290; 1746-1391
- PMID
- 40956767
- Copyright note
- © 2025 The Author(s). European Journal of Sport Science published by Wiley-VCH GmbH on behalf of European College of Sport Science. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
- Data Availability
- All data are available upon reasonable request.
- Organisation Unit
- School of Health
- Language
- English
- Record Identifier
- 991171944102621
- Output Type
- Journal article
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