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Sauna Exposure Immediately Prior to Short-term Heat Acclimation Accelerates Phenotypic Adaptation in Females

Mee, Jessica A., Peters, S., Doust, J.H. and Maxwell, N.S. (2018) Sauna Exposure Immediately Prior to Short-term Heat Acclimation Accelerates Phenotypic Adaptation in Females. Journal of Science and Medicine in Sport, 21 (2). pp. 190-195. ISSN Online: 1440-2440

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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.

Item Type: Article
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This is an Accepted Manuscript of an article published by Elsevier B.V. in the Journal of Science and Medicine in Sport. © 2017 Sports Medicine Australia. The accepted manuscript is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International. http://creativecommons.org/licenses/by-nc-nd/4.0/

Staff and students at the University of Worcester have access to the full-text of the published version via the UW online Library Search. External users should check availability with their local library or Interlibrary Requests Service.

Uncontrolled Keywords: controlled hyperthermia, sweat sodium chloride, 17-β estradiol, progesterone, thermoregulation
Subjects: Q Science > QP Physiology
Divisions: Academic Departments > Institute of Sport and Exercise Science
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Depositing User: Jessica Mee
Date Deposited: 06 Jun 2019 10:24
Last Modified: 04 Jul 2019 01:00
URI: https://eprints.worc.ac.uk/id/eprint/8118

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