Loading…
Thermo-behavioural responses to orally applied L-menthol exhibit sex-specific differences during exercise in a hot environment
Aims: This 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. Methods: Twenty-two participants (eleven females, eleven males) completed two...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Default Article |
| Published: |
2020
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/2134/13258817.v1 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1818167113141977088 |
|---|---|
| author | Abbie Jayne Parton Mark Waldron Tom Clifford Owen Jeffries |
| author_facet | Abbie Jayne Parton Mark Waldron Tom Clifford Owen Jeffries |
| author_sort | Abbie Jayne Parton (9660365) |
| collection | Figshare |
| description | Aims: This 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. Methods: Twenty-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 o 40 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. Results: Thermal 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. Conclusions: L-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. |
| format | Default Article |
| id | rr-article-13258817 |
| institution | Loughborough University |
| publishDate | 2020 |
| record_format | Figshare |
| spelling | rr-article-132588172020-11-18T00:00:00Z Thermo-behavioural responses to orally applied L-menthol exhibit sex-specific differences during exercise in a hot environment Abbie Jayne Parton (9660365) Mark Waldron (9660368) Tom Clifford (7468394) Owen Jeffries (8150820) Behavioral Science & Comparative Psychology Biological Sciences Medical and Health Sciences Psychology and Cognitive Sciences Gender Female Heat Menthol Perception Thermoregulation Aims: This 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. <br>Methods: Twenty-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 o 40 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. <br>Results: Thermal 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. <br>Conclusions: L-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. 2020-11-18T00:00:00Z Text Journal contribution 2134/13258817.v1 https://figshare.com/articles/journal_contribution/Thermo-behavioural_responses_to_orally_applied_L-menthol_exhibit_sex-specific_differences_during_exercise_in_a_hot_environment/13258817 CC BY-NC-ND 4.0 |
| spellingShingle | Behavioral Science & Comparative Psychology Biological Sciences Medical and Health Sciences Psychology and Cognitive Sciences Gender Female Heat Menthol Perception Thermoregulation Abbie Jayne Parton Mark Waldron Tom Clifford Owen Jeffries Thermo-behavioural responses to orally applied L-menthol exhibit sex-specific differences during exercise in a hot environment |
| title | 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_short | 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 |
| topic | Behavioral Science & Comparative Psychology Biological Sciences Medical and Health Sciences Psychology and Cognitive Sciences Gender Female Heat Menthol Perception Thermoregulation |
| url | https://hdl.handle.net/2134/13258817.v1 |