Post-exercise, passive heat acclimation with sauna or hot-water immersion provide comparable adaptations to performance in the heat in a military context
Ashworth E, Cotter J, Kilding A
Ergonomics · 8 citations
How it was studied
- Design
- Randomized controlled trial (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Independent funding
- University or hospital
- Auckland University of Technology, New Zealand
- University or hospital
- Auckland University of Technology
Based on 2 listed funder(s).
Publication
- Published
- 2022-03-25 · Ergonomics · vol. 66 · issue 1 · pp. 49–60
- Publisher
- Taylor & Francis
- Cited
- 10 citations · more than 74% of similar papers · 1.0× the field average
- References
- 41 works
- Access
- Paywalled
- Research areas
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Occupational Health and Performance
- Keywords
- Heat stress, Heat illness, Acclimatization, Immersion (mathematics), Core temperature, Heart rate, Medicine, Context (archaeology), Relative humidity, Environmental science, Physical therapy, Animal science, Meteorology, Anesthesia, Mathematics, Physics, Internal medicine, Blood pressure, Biology, Ecology
- MeSH
- humans, water, steam bath, cross-over studies, immersion, acclimatization, heart rate, military personnel, hot temperature
3 authors
From NZ
- Edward Tom Ashworth · correspondingAuckland University of Technology
- James David CotterUniversity of Otago
- Andrew Edward KildingAuckland University of Technology
Abstract
To mitigate the effects of heat during operations in hot environments, military personnel will likely benefit from heat acclimation (HA) conducted prior to deployment. Using post-exercise, passive heating, 25 participants completed a 5 d HA regime in sauna (70 °C, 18% RH) or hot-water immersion (HWI) (40 °C) for ≤40 min, preceded and followed by a heat stress test (1-h walking at 5 km.h-1 in 33 °C, 77% RH in military uniform (20 kg) before an incremental ramp to exhaustion). Fifteen completed both regimes in a randomised, cross-over manner. While performance did not significantly improve (+14%, [-1, 29], p = .079), beneficial adaptations were observed for mean exercising core temperature (-0.2 °C, [-0.2, -0.2], p -0.2 °C, [-0.2, -0.2], p = 035) and heart rate (-8 bpm, [-6, -10], pPractitioner summary: Strategies are required to prevent health and performance impairments during military operations upon arrival in hot environments. Using a randomised, cross-over design, participants completed five-day passive, post-exercise heat acclimation using sauna or hot-water immersion. Both regimes elicited beneficial albeit modest heat adaptations.Abbreviations: HA: heat acclimation; HST: heat stress test; HWI: hot-water immersion; RH: relative humidity.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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