Short-term isothermic heat acclimation elicits beneficial adaptations but medium-term elicits a more complete adaptation

Jodie N Moss; Freya M. Bayne; Federico Castelli; Mitchell R. Naughton; Thomas C. Reeve; Steven J. Trangmar; Richard Mackenzie; Christopher J.  Tyler

doi:10.1007/s00421-019-04269-5

Short-term isothermic heat acclimation elicits beneficial adaptations but medium-term elicits a more complete adaptation

Jodie N Moss, Freya M. Bayne, Federico Castelli, Mitchell R. Naughton, Thomas C. Reeve, Steven J. Trangmar, Richard Mackenzie, Christopher J. Tyler

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30 Citations (Scopus)

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Abstract

Purpose: To investigate the effects of 60 min daily, short-term (STHA) and medium-term (MTHA) isothermic heat acclimation (HA) on the physiological and perceptual responses to exercise heat stress.

Methods: Sixteen, ultra-endurance runners (female = 3) visited the laboratory on 13 occasions. A 45 min sub-maximal (40% W _max) cycling heat stress test (HST) was completed in the heat (40 °C, 50% relative humidity) on the first (HST _PRE), seventh (HST _STHA) and thirteenth (HST _MTHA) visit. Participants completed 5 consecutive days of a 60 min isothermic HA protocol (target T _re 38.5 °C) between HST _PRE and HST _STHA and 5 more between HST _STHA and HST _MTHA. Heart rate (HR), rectal (T _re), skin (T _sk) and mean body temperature (T _body), perceived exertion (RPE), thermal comfort (TC) and sensation (TS) were recorded every 5 min. During HSTs, cortisol was measured pre and post and expired air was collected at 15, 30 and 45 min.

Results: At rest, T _re and T _body were lower in HST _STHA and HST _MTHA compared to HST _PRE, but resting HR was not different between trials. Mean exercising T _re, T _sk, T _body, and HR were lower in both HST _STHA and HST _MTHA compared to HST _PRE. There were no differences between HST _STHA and HST _MTHA. Perceptual measurements were lowered by HA and further reduced during HST _MTHA.

Conclusion: A 60 min a day isothermic STHA was successful at reducing physiological and perceptual strain experienced when exercising in the heat; however, MTHA offered a more complete adaptation.

Original language	English
Pages (from-to)	243-254
Number of pages	12
Journal	European Journal of Applied Physiology
Volume	120
Early online date	25 Nov 2019
DOIs	https://doi.org/10.1007/s00421-019-04269-5
Publication status	Published - Jan 2020
Externally published	Yes

Bibliographical note

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Keywords

Heat strain
Acclimatisation
Endurance performance
Taper
Thermoregulation

ASJC Scopus subject areas

Public Health, Environmental and Occupational Health
Physiology (medical)
Orthopedics and Sports Medicine

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1007/s00421-019-04269-5Licence: CC BY

PublishedFinal published version, 1.21 MBLicence: CC BY

Cite this

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title = "Short-term isothermic heat acclimation elicits beneficial adaptations but medium-term elicits a more complete adaptation",

abstract = "Purpose: To investigate the effects of 60 min daily, short-term (STHA) and medium-term (MTHA) isothermic heat acclimation (HA) on the physiological and perceptual responses to exercise heat stress. Methods: Sixteen, ultra-endurance runners (female = 3) visited the laboratory on 13 occasions. A 45 min sub-maximal (40\% W max) cycling heat stress test (HST) was completed in the heat (40 °C, 50\% relative humidity) on the first (HST PRE), seventh (HST STHA) and thirteenth (HST MTHA) visit. Participants completed 5 consecutive days of a 60 min isothermic HA protocol (target T re 38.5 °C) between HST PRE and HST STHA and 5 more between HST STHA and HST MTHA. Heart rate (HR), rectal (T re), skin (T sk) and mean body temperature (T body), perceived exertion (RPE), thermal comfort (TC) and sensation (TS) were recorded every 5 min. During HSTs, cortisol was measured pre and post and expired air was collected at 15, 30 and 45 min. Results: At rest, T re and T body were lower in HST STHA and HST MTHA compared to HST PRE, but resting HR was not different between trials. Mean exercising T re, T sk, T body, and HR were lower in both HST STHA and HST MTHA compared to HST PRE. There were no differences between HST STHA and HST MTHA. Perceptual measurements were lowered by HA and further reduced during HST MTHA. Conclusion: A 60 min a day isothermic STHA was successful at reducing physiological and perceptual strain experienced when exercising in the heat; however, MTHA offered a more complete adaptation.",

keywords = "Heat strain, Acclimatisation, Endurance performance, Taper, Thermoregulation",

author = "Moss, \{Jodie N\} and Bayne, \{Freya M.\} and Federico Castelli and Naughton, \{Mitchell R.\} and Reeve, \{Thomas C.\} and Trangmar, \{Steven J.\} and Richard Mackenzie and Tyler, \{Christopher J.\}",

note = "This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.",

year = "2020",

month = jan,

doi = "10.1007/s00421-019-04269-5",

language = "English",

volume = "120",

pages = "243--254",

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T1 - Short-term isothermic heat acclimation elicits beneficial adaptations but medium-term elicits a more complete adaptation

AU - Moss, Jodie N

AU - Bayne, Freya M.

AU - Castelli, Federico

AU - Naughton, Mitchell R.

AU - Reeve, Thomas C.

AU - Trangmar, Steven J.

AU - Mackenzie, Richard

AU - Tyler, Christopher J.

N1 - This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

PY - 2020/1

Y1 - 2020/1

N2 - Purpose: To investigate the effects of 60 min daily, short-term (STHA) and medium-term (MTHA) isothermic heat acclimation (HA) on the physiological and perceptual responses to exercise heat stress. Methods: Sixteen, ultra-endurance runners (female = 3) visited the laboratory on 13 occasions. A 45 min sub-maximal (40% W max) cycling heat stress test (HST) was completed in the heat (40 °C, 50% relative humidity) on the first (HST PRE), seventh (HST STHA) and thirteenth (HST MTHA) visit. Participants completed 5 consecutive days of a 60 min isothermic HA protocol (target T re 38.5 °C) between HST PRE and HST STHA and 5 more between HST STHA and HST MTHA. Heart rate (HR), rectal (T re), skin (T sk) and mean body temperature (T body), perceived exertion (RPE), thermal comfort (TC) and sensation (TS) were recorded every 5 min. During HSTs, cortisol was measured pre and post and expired air was collected at 15, 30 and 45 min. Results: At rest, T re and T body were lower in HST STHA and HST MTHA compared to HST PRE, but resting HR was not different between trials. Mean exercising T re, T sk, T body, and HR were lower in both HST STHA and HST MTHA compared to HST PRE. There were no differences between HST STHA and HST MTHA. Perceptual measurements were lowered by HA and further reduced during HST MTHA. Conclusion: A 60 min a day isothermic STHA was successful at reducing physiological and perceptual strain experienced when exercising in the heat; however, MTHA offered a more complete adaptation.

AB - Purpose: To investigate the effects of 60 min daily, short-term (STHA) and medium-term (MTHA) isothermic heat acclimation (HA) on the physiological and perceptual responses to exercise heat stress. Methods: Sixteen, ultra-endurance runners (female = 3) visited the laboratory on 13 occasions. A 45 min sub-maximal (40% W max) cycling heat stress test (HST) was completed in the heat (40 °C, 50% relative humidity) on the first (HST PRE), seventh (HST STHA) and thirteenth (HST MTHA) visit. Participants completed 5 consecutive days of a 60 min isothermic HA protocol (target T re 38.5 °C) between HST PRE and HST STHA and 5 more between HST STHA and HST MTHA. Heart rate (HR), rectal (T re), skin (T sk) and mean body temperature (T body), perceived exertion (RPE), thermal comfort (TC) and sensation (TS) were recorded every 5 min. During HSTs, cortisol was measured pre and post and expired air was collected at 15, 30 and 45 min. Results: At rest, T re and T body were lower in HST STHA and HST MTHA compared to HST PRE, but resting HR was not different between trials. Mean exercising T re, T sk, T body, and HR were lower in both HST STHA and HST MTHA compared to HST PRE. There were no differences between HST STHA and HST MTHA. Perceptual measurements were lowered by HA and further reduced during HST MTHA. Conclusion: A 60 min a day isothermic STHA was successful at reducing physiological and perceptual strain experienced when exercising in the heat; however, MTHA offered a more complete adaptation.

KW - Heat strain

KW - Acclimatisation

KW - Endurance performance

KW - Taper

KW - Thermoregulation

UR - https://www.scopus.com/pages/publications/85075573227

U2 - 10.1007/s00421-019-04269-5

DO - 10.1007/s00421-019-04269-5

M3 - Article

SN - 1439-6319

VL - 120

SP - 243

EP - 254

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

ER -

Short-term isothermic heat acclimation elicits beneficial adaptations but medium-term elicits a more complete adaptation

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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