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The effect of 8-day oral taurine supplementation on thermoregulation during low-intensity exercise at fixed heat production in hot conditions of incremental humidity
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Shane Heffernan ,
Venturino R. Nevola,
Liam Kilduff ,
Kathryn Coates,
Ed Dudley,
Mark Waldron
European Journal of Applied Physiology
Swansea University Authors:
Jenny Peel, Melitta McNarry , Shane Heffernan , Liam Kilduff , Kathryn Coates, Ed Dudley, Mark Waldron
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DOI (Published version): 10.1007/s00421-024-05478-3
Abstract
Purpose To determine the effect of taurine supplementation on sweating and core temperature responses, including the transition from compensable to uncompensable heat stress, during prolonged low-intensity exercise of a fixed-heat production (~200W/m2) in hot conditions (37.5°C), at both fixed and i...
| Published in: | European Journal of Applied Physiology |
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| ISSN: | 1439-6319 1439-6327 |
| Published: |
Springer Science and Business Media LLC
2024
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa65883 |
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| Abstract: |
Purpose To determine the effect of taurine supplementation on sweating and core temperature responses, including the transition from compensable to uncompensable heat stress, during prolonged low-intensity exercise of a fixed-heat production (~200W/m2) in hot conditions (37.5°C), at both fixed and incremental vapour-pressure.Methods Fifteen females (n=3) and males (n=12; 27±5years, 78±9kg, ̇O2max 50.3±7.8mL/kg/min), completed a treadmill walking protocol (~200W/m2 heat production [Ḣprod]) in the heat (37.5±0.1°C) at fixed- (16mmHg) and ramped-humidity (Δ1.5mmHg/5-min) following one week of oral taurine supplementation (50mg/kg/bm) or placebo, in a double-blind, randomised, cross-over design. Participants were assessed for whole-body sweat loss (WBSL), local sweat rate (LSR), sweat gland activation (SGA), core temperature (Tcore), breakpoint of compensability (Pcrit) and calorimetric heat transfer components. Plasma volume and plasma taurine concentrations were established through pre- and post-trial blood samples.Results Taurine supplementation increased WBSL by 26.6% and 5.1% (p=0.035), LSR by 15.5% and 7.8% (p=0.013), SGA (1x1cm) by 32.2% and 29.9% (p<0.001) and SGA (3x3cm) by 22.1% and 17.1% (p=0.015) during the fixed- and ramped-humidity exercise periods, respectively. Evaporative heat loss was enhanced by 27% (p=0.010), heat-storage reduced by 72% (p=0.024) and Pcrit was greater in taurine vs placebo (25.0mmHg vs 21.7mmHg; p=0.002).Conclusion Taurine supplementation increased sweating responses during fixed Ḣprod in hot conditions, prior to substantial heat strain and before the breakpoint of compensability, demonstrating improved thermoregulatory capacity. The enhanced evaporative cooling and reduced heat-storage delayed the subsequent upward inflection in Tcore –represented by a greater Pcrit– and offers a potential dietary supplementation strategy to support thermoregulation. |
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| Keywords: |
Taurine, sweating, heat, uncompensability, evaporative cooling, thermoregulation |
| College: |
Faculty of Science and Engineering |
| Funders: |
Swansea University |