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

Journal article


Moss, J.N., Bayne, F., Castelli, F., Naughton, M.R., Reeve, T.C., Trangmar, S.J., Mackenzie, R.W.A. and Tyler, C.J. (2020). Short-term isothermic heat acclimation elicits beneficial adaptations but medium-term elicits a more complete adaptation. https://link.springer.com/article/10.1007/s00421-019-04269-5. 120 (1). https://doi.org/10.1007/s00421-019-04269-5
AuthorsMoss, J.N., Bayne, F., Castelli, F., Naughton, M.R., Reeve, T.C., Trangmar, S.J., Mackenzie, R.W.A. and Tyler, C.J.
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% Wmax) cycling heat stress test (HST) was completed in the heat (40 °C, 50% relative humidity) on the first (HSTPRE), seventh (HSTSTHA) and thirteenth (HSTMTHA) visit. Participants completed 5 consecutive days of a 60 min isothermic HA protocol (target Tre 38.5 °C) between HSTPRE and HSTSTHA and 5 more between HSTSTHA and HSTMTHA. Heart rate (HR), rectal (Tre), skin (Tsk) and mean body temperature (Tbody), 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, Tre and Tbody were lower in HSTSTHA and HSTMTHA compared to HSTPRE, but resting HR was not different between trials. Mean exercising Tre, Tsk, Tbody, and HR were lower in both HSTSTHA and HSTMTHA compared to HSTPRE. There were no differences between HSTSTHA and HSTMTHA. Perceptual measurements were lowered by HA and further reduced during HSTMTHA.

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.

KeywordsHeat strain · Acclimatisation · Endurance performance · Taper · Thermoregulation
Year2020
Journalhttps://link.springer.com/article/10.1007/s00421-019-04269-5
Journal citation120 (1)
PublisherSpringer
ISSN1439-6327
Digital Object Identifier (DOI)https://doi.org/10.1007/s00421-019-04269-5
Web address (URL)https://link.springer.com/article/10.1007/s00421-019-04269-5
Publication dates
Print25 Nov 2019
Publication process dates
Accepted18 Nov 2019
Deposited01 Dec 2022
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Open
Accepted author manuscript
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File Access Level
Controlled
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