Sauna exposure immediately prior to short-term heat acclimation accelerates phenotypic adaptation in females

Jessica Mee, Sophie Peters, Jonathan Doust, Neil Maxwell

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Objectives: Investigate whether a sauna exposure prior to short-term heat acclimation (HA) accelerates phenotypic adaptation in females. Design: Randomised, repeated measures, cross-over trial. Methods: Nine females performed two 5-d HA interventions (controlled hyperthermia Tre ≥ 38.5°C), separated by 7-wk, during the follicular phase of the menstrual cycle confirmed by plasma concentrations of 17-β estradiol and progesterone. Prior to each 90-min HA session participants sat for 20-min in either a temperate environment (20°C, 40% RH; HAtemp) wearing shorts and sports bra or a hot environment (50°C, 30% RH) wearing a sauna suit to replicate sauna conditions (HAsauna). Participants performed a running heat tolerance test (RHTT) 24-hr pre and 24-hr post HA. Results: Mean heart rate (HR) (85±4 vs. 68±5 bpm, p≤0.001), sweat rate (0.4±0.2 vs. 0.0±0.0 L.hr-1, p≤0.001), and thermal sensation (6±0 vs. 5±1, p=0.050) were higher during the sauna compared to temperate exposure. Resting rectal temperature (Tre) (-0.28±0.16°C), peak Tre (-0.42±0.22°C), resting HR (-10±4 bpm), peak HR (-12±7 bpm), Tre at sweating onset (-0.29±0.17°C) (p≤0.001), thermal sensation (-0.5±0.5; p=0.002), and perceived exertion (-3±2; p≤0.001) reduced during the RHTT, following HAsauna; but not HAtemp. Plasma volume expansion was greater following HAsauna (HAsauna, 9±7%; HAtemp, 1±5%; p=0.013). Sweat rate (p≤0.001) increased and sweat NaCl (p=0.006) reduced during the RHTT following HAsauna and HAtemp. Conclusions: This novel strategy initiated HA with an attenuation of thermoregulatory, cardiovascular, and perceptual strain in females due to a measurably greater strain in the sauna compared to temperate exposure when adopted prior to STHA.
Original languageEnglish
Pages (from-to)190-195
Number of pages6
JournalJournal of Science and Medicine in Sport
Volume21
Issue number2
DOIs
Publication statusPublished - 4 Jul 2017

Fingerprint

Steam Bath
Acclimatization
Hot Temperature
Sweat
Running
Temperature
Heart Rate
Sweating
Follicular Phase
Plasma Volume
Cross-Over Studies
Sports
Progesterone
Estradiol
Fever

Bibliographical note

© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Controlled hyperthermia
  • sweat sodium chloride
  • 17-β estradiol
  • progesterone
  • thermoregulation

Cite this

@article{71de336907f34b809dc5689e5aca8c85,
title = "Sauna exposure immediately prior to short-term heat acclimation accelerates phenotypic adaptation in females",
abstract = "Objectives: Investigate whether a sauna exposure prior to short-term heat acclimation (HA) accelerates phenotypic adaptation in females. Design: Randomised, repeated measures, cross-over trial. Methods: Nine females performed two 5-d HA interventions (controlled hyperthermia Tre ≥ 38.5°C), separated by 7-wk, during the follicular phase of the menstrual cycle confirmed by plasma concentrations of 17-β estradiol and progesterone. Prior to each 90-min HA session participants sat for 20-min in either a temperate environment (20°C, 40{\%} RH; HAtemp) wearing shorts and sports bra or a hot environment (50°C, 30{\%} RH) wearing a sauna suit to replicate sauna conditions (HAsauna). Participants performed a running heat tolerance test (RHTT) 24-hr pre and 24-hr post HA. Results: Mean heart rate (HR) (85±4 vs. 68±5 bpm, p≤0.001), sweat rate (0.4±0.2 vs. 0.0±0.0 L.hr-1, p≤0.001), and thermal sensation (6±0 vs. 5±1, p=0.050) were higher during the sauna compared to temperate exposure. Resting rectal temperature (Tre) (-0.28±0.16°C), peak Tre (-0.42±0.22°C), resting HR (-10±4 bpm), peak HR (-12±7 bpm), Tre at sweating onset (-0.29±0.17°C) (p≤0.001), thermal sensation (-0.5±0.5; p=0.002), and perceived exertion (-3±2; p≤0.001) reduced during the RHTT, following HAsauna; but not HAtemp. Plasma volume expansion was greater following HAsauna (HAsauna, 9±7{\%}; HAtemp, 1±5{\%}; p=0.013). Sweat rate (p≤0.001) increased and sweat NaCl (p=0.006) reduced during the RHTT following HAsauna and HAtemp. Conclusions: This novel strategy initiated HA with an attenuation of thermoregulatory, cardiovascular, and perceptual strain in females due to a measurably greater strain in the sauna compared to temperate exposure when adopted prior to STHA.",
keywords = "Controlled hyperthermia, sweat sodium chloride, 17-β estradiol, progesterone, thermoregulation",
author = "Jessica Mee and Sophie Peters and Jonathan Doust and Neil Maxwell",
note = "{\circledC} 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/",
year = "2017",
month = "7",
day = "4",
doi = "10.1016/j.jsams.2017.06.024",
language = "English",
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journal = "Journal of Science and Medicine in Sport",
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}

Sauna exposure immediately prior to short-term heat acclimation accelerates phenotypic adaptation in females. / Mee, Jessica; Peters, Sophie; Doust, Jonathan; Maxwell, Neil.

In: Journal of Science and Medicine in Sport, Vol. 21, No. 2, 04.07.2017, p. 190-195.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Sauna exposure immediately prior to short-term heat acclimation accelerates phenotypic adaptation in females

AU - Mee, Jessica

AU - Peters, Sophie

AU - Doust, Jonathan

AU - Maxwell, Neil

N1 - © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2017/7/4

Y1 - 2017/7/4

N2 - Objectives: Investigate whether a sauna exposure prior to short-term heat acclimation (HA) accelerates phenotypic adaptation in females. Design: Randomised, repeated measures, cross-over trial. Methods: Nine females performed two 5-d HA interventions (controlled hyperthermia Tre ≥ 38.5°C), separated by 7-wk, during the follicular phase of the menstrual cycle confirmed by plasma concentrations of 17-β estradiol and progesterone. Prior to each 90-min HA session participants sat for 20-min in either a temperate environment (20°C, 40% RH; HAtemp) wearing shorts and sports bra or a hot environment (50°C, 30% RH) wearing a sauna suit to replicate sauna conditions (HAsauna). Participants performed a running heat tolerance test (RHTT) 24-hr pre and 24-hr post HA. Results: Mean heart rate (HR) (85±4 vs. 68±5 bpm, p≤0.001), sweat rate (0.4±0.2 vs. 0.0±0.0 L.hr-1, p≤0.001), and thermal sensation (6±0 vs. 5±1, p=0.050) were higher during the sauna compared to temperate exposure. Resting rectal temperature (Tre) (-0.28±0.16°C), peak Tre (-0.42±0.22°C), resting HR (-10±4 bpm), peak HR (-12±7 bpm), Tre at sweating onset (-0.29±0.17°C) (p≤0.001), thermal sensation (-0.5±0.5; p=0.002), and perceived exertion (-3±2; p≤0.001) reduced during the RHTT, following HAsauna; but not HAtemp. Plasma volume expansion was greater following HAsauna (HAsauna, 9±7%; HAtemp, 1±5%; p=0.013). Sweat rate (p≤0.001) increased and sweat NaCl (p=0.006) reduced during the RHTT following HAsauna and HAtemp. Conclusions: This novel strategy initiated HA with an attenuation of thermoregulatory, cardiovascular, and perceptual strain in females due to a measurably greater strain in the sauna compared to temperate exposure when adopted prior to STHA.

AB - Objectives: Investigate whether a sauna exposure prior to short-term heat acclimation (HA) accelerates phenotypic adaptation in females. Design: Randomised, repeated measures, cross-over trial. Methods: Nine females performed two 5-d HA interventions (controlled hyperthermia Tre ≥ 38.5°C), separated by 7-wk, during the follicular phase of the menstrual cycle confirmed by plasma concentrations of 17-β estradiol and progesterone. Prior to each 90-min HA session participants sat for 20-min in either a temperate environment (20°C, 40% RH; HAtemp) wearing shorts and sports bra or a hot environment (50°C, 30% RH) wearing a sauna suit to replicate sauna conditions (HAsauna). Participants performed a running heat tolerance test (RHTT) 24-hr pre and 24-hr post HA. Results: Mean heart rate (HR) (85±4 vs. 68±5 bpm, p≤0.001), sweat rate (0.4±0.2 vs. 0.0±0.0 L.hr-1, p≤0.001), and thermal sensation (6±0 vs. 5±1, p=0.050) were higher during the sauna compared to temperate exposure. Resting rectal temperature (Tre) (-0.28±0.16°C), peak Tre (-0.42±0.22°C), resting HR (-10±4 bpm), peak HR (-12±7 bpm), Tre at sweating onset (-0.29±0.17°C) (p≤0.001), thermal sensation (-0.5±0.5; p=0.002), and perceived exertion (-3±2; p≤0.001) reduced during the RHTT, following HAsauna; but not HAtemp. Plasma volume expansion was greater following HAsauna (HAsauna, 9±7%; HAtemp, 1±5%; p=0.013). Sweat rate (p≤0.001) increased and sweat NaCl (p=0.006) reduced during the RHTT following HAsauna and HAtemp. Conclusions: This novel strategy initiated HA with an attenuation of thermoregulatory, cardiovascular, and perceptual strain in females due to a measurably greater strain in the sauna compared to temperate exposure when adopted prior to STHA.

KW - Controlled hyperthermia

KW - sweat sodium chloride

KW - 17-β estradiol

KW - progesterone

KW - thermoregulation

U2 - 10.1016/j.jsams.2017.06.024

DO - 10.1016/j.jsams.2017.06.024

M3 - Article

VL - 21

SP - 190

EP - 195

JO - Journal of Science and Medicine in Sport

JF - Journal of Science and Medicine in Sport

SN - 1440-2440

IS - 2

ER -