Loughborough University
Browse
japplphysiol.00348.2022.pdf (2.16 MB)

Thermoregulatory responses during road races in hot-humid conditions at the 2019 Athletics World Championships

Download (2.16 MB)
journal contribution
posted on 2023-05-16, 13:36 authored by Polly Aylwin, George HavenithGeorge Havenith, Marco Cardinale, Alex LloydAlex Lloyd, Mohammed Ihsan, Lee TaylorLee Taylor, Paolo Emilio Adami, Marine Alhammoud, Juan-Manuel Alonso, Nicolas Bouscaren, Sebastian Buitrago, Chris Esh, Josu Gomez-Ezeiza, Frederic Garrandes, Mariem Labidi, Gűnter Lange, Sébastien Moussay, Khouloud Mtibaa, Nathan Townsend, Mathew Wilson, Stéphane Bermon, Sebastien Racinais

Purpose: To characterise thermoregulatory and performance responses of elite road-race athletes, while competing in hot, humid, night-time conditions during the 2019 IAAF World Athletic Championships. 

Method: Male and female athletes, competing in the 20 km racewalk (n=20 males, 24 females), 50 km racewalk (n=19 males, 8 females) and marathon (n=15 males, 22 females) participated. Exposed mean skin (Tsk) and continuous core body (Tc) temperature were recorded with infrared thermography and ingestible telemetry pill, respectively. 

Results: The range of ambient conditions (recorded roadside) were 29.3-32.7°C air temperature, 46-81 % relative humidity, 0.1-1.7 m∙s-1 air velocity and 23.5-30.6°C wet bulb globe temperature. Tc increased by 1.5 ± 0.1°C but mean Tsk decreased by 1.5 ± 0.4°C over the duration of the races. Tsk and Tc changed most rapidly at the start of the races and then plateaued, with Tc showing a rapid increase again at the end, in a pattern mirroring pacing. Performance times were between 3 to 20 % (mean = 113 ± 6%) longer during the championships compared to the personal best (PB) of athletes. Overall mean performance relative to PB was correlated with the wet-bulb globe temperature (WBGT) of each race (R2 = 0.89), but not with thermophysiological variables (R2 ≤ 0.3). 

Conclusion: As previously reported in exercise heat stress, in this field study Tc rose with exercise duration, whereas Tsk showed a decline. The latter contradicts the commonly recorded rise and plateau in laboratory studies at similar ambient temperatures, but without realistic air movement.

Funding

World Athletic (formerly IAAF)

History

School

  • Design and Creative Arts
  • Sport, Exercise and Health Sciences

Department

  • Design

Published in

Journal of Applied Physiology

Volume

134

Issue

5

Pages

1300-1311

Publisher

American Physiological Society

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by the American Physiological Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2023-03-30

Publication date

2023-04-06

Copyright date

2023

ISSN

8750-7587

eISSN

1522-1601

Language

  • en

Depositor

Prof George Havenith. Deposit date: 9 April 2023

Usage metrics

    Loughborough Publications

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC