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Complement Ther Med. 2021 Dec 23;64:102798. doi: 10.1016/j.ctim.2021.102798. Epub 2021 Dec 23.

Infrared sauna as exercise-mimetic? Physiological responses to infrared sauna vs exercise in healthy women: A randomized controlled crossover trial.

Complementary therapies in medicine

Joy N Hussain, Marc M Cohen, Nitin Mantri, Cindy J O'Malley, Ronda F Greaves

Affiliations

  1. School of Health and Biomedical Sciences, RMIT University - Bundoora Campus, Melbourne 3083, Australia. Electronic address: [email protected].
  2. Extreme Wellness Institute, Melbourne, Australia.
  3. Pangenomics Group, School of Science, RMIT University - Bundoora Campus, Melbourne 3083, Australia.
  4. School of Health and Biomedical Sciences, RMIT University - Bundoora Campus, Melbourne 3083, Australia.
  5. School of Health and Biomedical Sciences, RMIT University - Bundoora Campus, Melbourne 3083, Australia; Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne 3052, Australia.

PMID: 34954348 DOI: 10.1016/j.ctim.2021.102798

Abstract

BACKGROUND: Passive heat therapies have been reported to have similar effects on the cardiovascular system as exercise. Studies supporting these findings in healthy populations have predominantly been done with men using warm water immersions or traditional saunas, rather than newer infrared-based saunas.

OBJECTIVE: To explore short-term thermal and cardiovascular responses in women using an infrared sauna as compared to moderate-intensity exercise.

STUDY DESIGN: Randomized controlled crossover trial with balanced allocations.

SETTING: Brisbane, Australia (August 2019 - March 2020) PARTICIPANTS: Ten healthy women (36 ± 9 years) INTERVENTIONS: 45 min of resting, infrared sauna or indoor bicycling PRIMARY OUTCOME MEASURES: tympanic/skin temperatures; respiratory rate; blood pressure; arterial stiffness; heart rate variability RESULTS: Tympanic temperatures were elevated during infrared sauna as compared to both control (mean diff = +1.05 

CONCLUSIONS: These findings suggest the physiological effects of infrared sauna bathing are underpinned by thermoregulatory-induced responses, more so than exercise-mimetic cardiorespiratory or cardiovascular activations.

Copyright © 2021 The Authors. Published by Elsevier Ltd.. All rights reserved.

Keywords: Exercise; Heart rate variability; Infrared sauna; Pulse wave analysis; Thermal responses

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