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Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes

Jenny Peel, Kevin John, Joe Page, Georgia Scott, Owen Jeffries Orcid Logo, Shane Heffernan Orcid Logo, Jamie Tallent, Mark Waldron Orcid Logo

European Journal of Sport Science, Volume: 23, Issue: 7, Pages: 1 - 20

Swansea University Authors: Jenny Peel, Kevin John, Joe Page, Georgia Scott, Shane Heffernan Orcid Logo, Mark Waldron Orcid Logo

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DOI (Published version): 10.1080/17461391.2022.2160278

Abstract

The factors explaining variance in thermoneutral maximal oxygen uptake (V ̇O2max) adaptation to heat acclimation (HA) were evaluated, with consideration of HA programme parameters, biophysical variables and thermo-physiological responses. Seventy-one participants consented to perform iso-intensity t...

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Published in: European Journal of Sport Science
ISSN: 1746-1391 1536-7290
Published: Informa UK Limited 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa62160
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Eight variables positively contributed (P &lt; 0.05) to the model: exercise intensity (%V ̇O2max), ambient temperature, HA training days, total exposure time, baseline body mass, thermal sensation, whole-body mass losses and the number of days between the final day of HA and the post-testing day. Within the ranges evaluated, iso-intensity HA improved V ̇O2max 63% of the time, with intensity- and volume-based parameters, alongside sufficient delays in post-testing being important considerations for V ̇O2max maximisation. 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spelling v2 62160 2022-12-12 Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes 86316fdeb6b4ee7ce0206f789eec781c Jenny Peel Jenny Peel true false b4ba2714a5148e000ad259ec5864d324 Kevin John Kevin John true false dff041586f0621c885755f69eb28eac6 Joe Page Joe Page true false e6170934bdc5ac51306b5aebecfe9aba Georgia Scott Georgia Scott true false 72c0b36891dfbec0378c0d0f7916e807 0000-0002-3297-9335 Shane Heffernan Shane Heffernan true false 70db7c6c54d46f5e70b39e5ae0a056fa 0000-0002-2720-4615 Mark Waldron Mark Waldron true false 2022-12-12 MEDE The factors explaining variance in thermoneutral maximal oxygen uptake (V ̇O2max) adaptation to heat acclimation (HA) were evaluated, with consideration of HA programme parameters, biophysical variables and thermo-physiological responses. Seventy-one participants consented to perform iso-intensity training (range: 45%-55% V ̇O2max) in the heat (range: 30°C-38°C; 20%-60% relative humidity) on consecutive days (range: 5-days-14-days) for between 50-min and-90 min. The participants were evaluated for their thermoneutral V ̇O2max change pre-to-post HA. Participants’ whole-body sweat rate, heart rate, core temperature, perceived exertion and thermal sensation and plasma volume were measured, and changes in these responses across the programme determined. Partial least squares regression was used to explain variance in the change in V ̇O2max across the programme using 24 variables. Sixty-three percent of the participants increased V ̇O2max more than the test error, with a mean±SD improvement of 2.6 ± 7.9%. A two-component model minimised the root mean squared error and explained the greatest variance (R2; 65%) in V ̇O2max change. Eight variables positively contributed (P < 0.05) to the model: exercise intensity (%V ̇O2max), ambient temperature, HA training days, total exposure time, baseline body mass, thermal sensation, whole-body mass losses and the number of days between the final day of HA and the post-testing day. Within the ranges evaluated, iso-intensity HA improved V ̇O2max 63% of the time, with intensity- and volume-based parameters, alongside sufficient delays in post-testing being important considerations for V ̇O2max maximisation. Monitoring of thermal sensation and body mass losses during the programme offers an accessible way to gauge the degree of potential adaptation. Journal Article European Journal of Sport Science 23 7 1 20 Informa UK Limited 1746-1391 1536-7290 Hot training; maximal oxygen consumption; endurance 7 1 2023 2023-01-07 10.1080/17461391.2022.2160278 COLLEGE NANME Biomedical Engineering COLLEGE CODE MEDE Swansea University SU Library paid the OA fee (TA Institutional Deal) This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. 2023-07-11T15:02:25.9945859 2022-12-12T11:18:45.9550042 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Jenny Peel 1 Kevin John 2 Joe Page 3 Georgia Scott 4 Owen Jeffries 0000-0002-8169-1100 5 Shane Heffernan 0000-0002-3297-9335 6 Jamie Tallent 7 Mark Waldron 0000-0002-2720-4615 8 62160__26402__cb725913399744bea7dc2b5b4d9b1ffe.pdf 62160_VoR.pdf 2023-01-26T13:26:59.7739377 Output 1404706 application/pdf Version of Record true © 2023 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes
spellingShingle Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes
Jenny Peel
Kevin John
Joe Page
Georgia Scott
Shane Heffernan
Mark Waldron
title_short Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes
title_full Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes
title_fullStr Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes
title_full_unstemmed Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes
title_sort Factors contributing to the change in thermoneutral maximal oxygen consumption after iso-intensity heat acclimation programmes
author_id_str_mv 86316fdeb6b4ee7ce0206f789eec781c
b4ba2714a5148e000ad259ec5864d324
dff041586f0621c885755f69eb28eac6
e6170934bdc5ac51306b5aebecfe9aba
72c0b36891dfbec0378c0d0f7916e807
70db7c6c54d46f5e70b39e5ae0a056fa
author_id_fullname_str_mv 86316fdeb6b4ee7ce0206f789eec781c_***_Jenny Peel
b4ba2714a5148e000ad259ec5864d324_***_Kevin John
dff041586f0621c885755f69eb28eac6_***_Joe Page
e6170934bdc5ac51306b5aebecfe9aba_***_Georgia Scott
72c0b36891dfbec0378c0d0f7916e807_***_Shane Heffernan
70db7c6c54d46f5e70b39e5ae0a056fa_***_Mark Waldron
author Jenny Peel
Kevin John
Joe Page
Georgia Scott
Shane Heffernan
Mark Waldron
author2 Jenny Peel
Kevin John
Joe Page
Georgia Scott
Owen Jeffries
Shane Heffernan
Jamie Tallent
Mark Waldron
format Journal article
container_title European Journal of Sport Science
container_volume 23
container_issue 7
container_start_page 1
publishDate 2023
institution Swansea University
issn 1746-1391
1536-7290
doi_str_mv 10.1080/17461391.2022.2160278
publisher Informa UK Limited
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The factors explaining variance in thermoneutral maximal oxygen uptake (V ̇O2max) adaptation to heat acclimation (HA) were evaluated, with consideration of HA programme parameters, biophysical variables and thermo-physiological responses. Seventy-one participants consented to perform iso-intensity training (range: 45%-55% V ̇O2max) in the heat (range: 30°C-38°C; 20%-60% relative humidity) on consecutive days (range: 5-days-14-days) for between 50-min and-90 min. The participants were evaluated for their thermoneutral V ̇O2max change pre-to-post HA. Participants’ whole-body sweat rate, heart rate, core temperature, perceived exertion and thermal sensation and plasma volume were measured, and changes in these responses across the programme determined. Partial least squares regression was used to explain variance in the change in V ̇O2max across the programme using 24 variables. Sixty-three percent of the participants increased V ̇O2max more than the test error, with a mean±SD improvement of 2.6 ± 7.9%. A two-component model minimised the root mean squared error and explained the greatest variance (R2; 65%) in V ̇O2max change. Eight variables positively contributed (P < 0.05) to the model: exercise intensity (%V ̇O2max), ambient temperature, HA training days, total exposure time, baseline body mass, thermal sensation, whole-body mass losses and the number of days between the final day of HA and the post-testing day. Within the ranges evaluated, iso-intensity HA improved V ̇O2max 63% of the time, with intensity- and volume-based parameters, alongside sufficient delays in post-testing being important considerations for V ̇O2max maximisation. Monitoring of thermal sensation and body mass losses during the programme offers an accessible way to gauge the degree of potential adaptation.
published_date 2023-01-07T15:02:22Z
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