Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment

Parton, Abbie Jayne; Waldron, Mark; Clifford, Tom; Jeffries, Owen

doi:10.1016/j.physbeh.2020.113250

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Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment

Abbie Jayne Parton, Mark Waldron

, Tom Clifford, Owen Jeffries

Physiology & Behavior, Volume: 229, Start page: 113250

Swansea University Author: Mark Waldron

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DOI (Published version): 10.1016/j.physbeh.2020.113250

Abstract

AimsThis study investigated the efficacy of L-menthol mouth-rinsing on thermal sensation and perceived effort in females and males, using a fixed-rating of perceived exertion (RPE) exercise protocol in a hot environment.MethodsTwenty-two participants (eleven females, eleven males) completed two tria...

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Published in:	Physiology & Behavior
ISSN:	0031-9384
Published:	Elsevier BV 2021
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URI:	https://cronfa.swan.ac.uk/Record/cronfa55692
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spelling	2021-01-12T11:49:16.6688212 v2 55692 2020-11-18 Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment 70db7c6c54d46f5e70b39e5ae0a056fa 0000-0002-2720-4615 Mark Waldron Mark Waldron true false 2020-11-18 STSC AimsThis study investigated the efficacy of L-menthol mouth-rinsing on thermal sensation and perceived effort in females and males, using a fixed-rating of perceived exertion (RPE) exercise protocol in a hot environment.MethodsTwenty-two participants (eleven females, eleven males) completed two trials using a fixed-RPE protocol at an exercise intensity between ‘hard’ and ‘very hard’, equating to 16 on the RPE scale at ∼35°C. Participants adjusted power output to maintain RPE-16. In a randomised, double-blind, crossover design, L-menthol or a control mouthwash was administered at an orally neutral temperature (∼32 °C) prior to exercise and at 10 min intervals thereafter. Measures of mechanical power output, core temperature, heart rate, perception of thermal sensation and thermal comfort, and whole-body sweat loss are reported.ResultsThermal sensation was lowered by L-menthol in both sexes (P < 0.05), however during exercise this was only maintained for 40% of the trial duration in females. Thermal comfort did not differ between conditions (P > 0.05). No differences in exercise duration were observed compared to control, despite a ∼4 % and ∼6 % increase in male and females respectively. Power output increased by ∼6.5 % males (P = 0.039) with no difference in females ∼2.2% (P = 0.475), compared to control. Core temperature, heart rate and whole-body sweat loss was not different between condition or sex.ConclusionsL-menthol lowered perceptual measures of thermal sensation in females, but did not attenuate a greater rate of rise in thermal sensitivity when exercising in a hot environment, compared to males. Males appeared to adopt a higher risk strategy by increasing power output following L-menthol administration in contrast to a more conservative pacing strategy in females. Therefore, there appear to be sex-specific differences in L-menthol's non-thermal cooling properties and subsequent effects on thermo-behavioural adjustments in work-load when exercising in a hot environment. Journal Article Physiology & Behavior 229 113250 Elsevier BV 0031-9384 Thermoregulation, Perception, Menthol, Heat, Female, Gender 1 2 2021 2021-02-01 10.1016/j.physbeh.2020.113250 COLLEGE NANME Sport and Exercise Sciences COLLEGE CODE STSC Swansea University 2021-01-12T11:49:16.6688212 2020-11-18T16:38:25.1116326 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences Abbie Jayne Parton 1 Mark Waldron 0000-0002-2720-4615 2 Tom Clifford 3 Owen Jeffries 4 55692__18692__c11c013af190418f8904cb38a55198b9.pdf 55692.pdf 2020-11-18T16:40:29.2964014 Output 853568 application/pdf Accepted Manuscript true 2021-11-18T00:00:00.0000000 © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title	Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment
spellingShingle	Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment Mark Waldron
title_short	Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment
title_full	Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment
title_fullStr	Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment
title_full_unstemmed	Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment
title_sort	Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment
author_id_str_mv	70db7c6c54d46f5e70b39e5ae0a056fa
author_id_fullname_str_mv	70db7c6c54d46f5e70b39e5ae0a056fa_***_Mark Waldron
author	Mark Waldron
author2	Abbie Jayne Parton Mark Waldron Tom Clifford Owen Jeffries
format	Journal article
container_title	Physiology & Behavior
container_volume	229
container_start_page	113250
publishDate	2021
institution	Swansea University
issn	0031-9384
doi_str_mv	10.1016/j.physbeh.2020.113250
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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department_str	School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences
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description	AimsThis study investigated the efficacy of L-menthol mouth-rinsing on thermal sensation and perceived effort in females and males, using a fixed-rating of perceived exertion (RPE) exercise protocol in a hot environment.MethodsTwenty-two participants (eleven females, eleven males) completed two trials using a fixed-RPE protocol at an exercise intensity between ‘hard’ and ‘very hard’, equating to 16 on the RPE scale at ∼35°C. Participants adjusted power output to maintain RPE-16. In a randomised, double-blind, crossover design, L-menthol or a control mouthwash was administered at an orally neutral temperature (∼32 °C) prior to exercise and at 10 min intervals thereafter. Measures of mechanical power output, core temperature, heart rate, perception of thermal sensation and thermal comfort, and whole-body sweat loss are reported.ResultsThermal sensation was lowered by L-menthol in both sexes (P < 0.05), however during exercise this was only maintained for 40% of the trial duration in females. Thermal comfort did not differ between conditions (P > 0.05). No differences in exercise duration were observed compared to control, despite a ∼4 % and ∼6 % increase in male and females respectively. Power output increased by ∼6.5 % males (P = 0.039) with no difference in females ∼2.2% (P = 0.475), compared to control. Core temperature, heart rate and whole-body sweat loss was not different between condition or sex.ConclusionsL-menthol lowered perceptual measures of thermal sensation in females, but did not attenuate a greater rate of rise in thermal sensitivity when exercising in a hot environment, compared to males. Males appeared to adopt a higher risk strategy by increasing power output following L-menthol administration in contrast to a more conservative pacing strategy in females. Therefore, there appear to be sex-specific differences in L-menthol's non-thermal cooling properties and subsequent effects on thermo-behavioural adjustments in work-load when exercising in a hot environment.
published_date	2021-02-01T04:10:06Z
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score	11.035634

Thermo-behavioural responses to orally applied l-menthol exhibit sex-specific differences during exercise in a hot environment

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