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Post-exercise hot water immersion induces heat acclimation and improves endurance exercise performance in the heat.
Scand J Med Sci Sports. 2016 Jul; 26(7):745-54.SJ

Abstract

We examined whether daily hot water immersion (HWI) after exercise in temperate conditions induces heat acclimation and improves endurance performance in temperate and hot conditions. Seventeen non-heat-acclimatized males performed a 6-day intervention involving a daily treadmill run for 40 min at 65% V̇O2max in temperate conditions (18 °C) followed immediately by either HWI (N = 10; 40 °C) or thermoneutral (CON, N = 7; 34 °C) immersion for 40 min. Before and after the 6-day intervention, participants performed a treadmill run for 40 min at 65% V̇O2max followed by a 5-km treadmill time trial (TT) in temperate (18 °C, 40% humidity) and hot (33 °C, 40% humidity) conditions. HWI induced heat acclimation demonstrated by lower resting rectal temperature (Tre , mean, -0.27 °C, P < 0.01), and final Tre during submaximal exercise in 18 °C (-0.28 °C, P < 0.01) and 33 °C (-0.36 °C, P < 0.01). Skin temperature, Tre at sweating onset and RPE were lower during submaximal exercise in 18 °C and 33 °C after 6 days in HWI (P < 0.05). Physiological strain and thermal sensation were also lower during submaximal exercise in 33 °C after 6 days in HWI (P < 0.05). HWI improved TT performance in 33 °C (4.9%, P < 0.01) but not in 18 °C. Thermoregulatory measures and performance did not change in CON. Hot water immersion after exercise on 6 days presents a simple, practical, and effective heat acclimation strategy to improve endurance performance in the heat.

Authors+Show Affiliations

College of Health and Behavioural Sciences, Bangor University, Bangor, Gwynedd, UK.College of Health and Behavioural Sciences, Bangor University, Bangor, Gwynedd, UK.College of Health and Behavioural Sciences, Bangor University, Bangor, Gwynedd, UK.College of Health and Behavioural Sciences, Bangor University, Bangor, Gwynedd, UK.

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

26661992

Citation

Zurawlew, M J., et al. "Post-exercise Hot Water Immersion Induces Heat Acclimation and Improves Endurance Exercise Performance in the Heat." Scandinavian Journal of Medicine & Science in Sports, vol. 26, no. 7, 2016, pp. 745-54.
Zurawlew MJ, Walsh NP, Fortes MB, et al. Post-exercise hot water immersion induces heat acclimation and improves endurance exercise performance in the heat. Scand J Med Sci Sports. 2016;26(7):745-54.
Zurawlew, M. J., Walsh, N. P., Fortes, M. B., & Potter, C. (2016). Post-exercise hot water immersion induces heat acclimation and improves endurance exercise performance in the heat. Scandinavian Journal of Medicine & Science in Sports, 26(7), 745-54. https://doi.org/10.1111/sms.12638
Zurawlew MJ, et al. Post-exercise Hot Water Immersion Induces Heat Acclimation and Improves Endurance Exercise Performance in the Heat. Scand J Med Sci Sports. 2016;26(7):745-54. PubMed PMID: 26661992.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Post-exercise hot water immersion induces heat acclimation and improves endurance exercise performance in the heat. AU - Zurawlew,M J, AU - Walsh,N P, AU - Fortes,M B, AU - Potter,C, Y1 - 2015/12/09/ PY - 2015/11/15/accepted PY - 2015/12/15/entrez PY - 2015/12/15/pubmed PY - 2017/3/31/medline KW - heat illness KW - hot bath KW - hyperthermia KW - perfor-mance KW - running KW - thermoregulation SP - 745 EP - 54 JF - Scandinavian journal of medicine & science in sports JO - Scand J Med Sci Sports VL - 26 IS - 7 N2 - We examined whether daily hot water immersion (HWI) after exercise in temperate conditions induces heat acclimation and improves endurance performance in temperate and hot conditions. Seventeen non-heat-acclimatized males performed a 6-day intervention involving a daily treadmill run for 40 min at 65% V̇O2max in temperate conditions (18 °C) followed immediately by either HWI (N = 10; 40 °C) or thermoneutral (CON, N = 7; 34 °C) immersion for 40 min. Before and after the 6-day intervention, participants performed a treadmill run for 40 min at 65% V̇O2max followed by a 5-km treadmill time trial (TT) in temperate (18 °C, 40% humidity) and hot (33 °C, 40% humidity) conditions. HWI induced heat acclimation demonstrated by lower resting rectal temperature (Tre , mean, -0.27 °C, P < 0.01), and final Tre during submaximal exercise in 18 °C (-0.28 °C, P < 0.01) and 33 °C (-0.36 °C, P < 0.01). Skin temperature, Tre at sweating onset and RPE were lower during submaximal exercise in 18 °C and 33 °C after 6 days in HWI (P < 0.05). Physiological strain and thermal sensation were also lower during submaximal exercise in 33 °C after 6 days in HWI (P < 0.05). HWI improved TT performance in 33 °C (4.9%, P < 0.01) but not in 18 °C. Thermoregulatory measures and performance did not change in CON. Hot water immersion after exercise on 6 days presents a simple, practical, and effective heat acclimation strategy to improve endurance performance in the heat. SN - 1600-0838 UR - https://www.unboundmedicine.com/medline/citation/26661992/Post_exercise_hot_water_immersion_induces_heat_acclimation_and_improves_endurance_exercise_performance_in_the_heat_ L2 - https://doi.org/10.1111/sms.12638 DB - PRIME DP - Unbound Medicine ER -