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Post-exercise Hot Water Immersion Elicits Heat Acclimation Adaptations in Endurance Trained and Recreationally Active Individuals.
Front Physiol. 2018; 9:1824.FP

Abstract

Hot water immersion (HWI) after exercise on 6 consecutive days in temperate conditions has been shown to provide heat acclimation adaptations in a recreationally active population. Endurance athletes experience frequent, sustained elevations in body temperature during training and competition; as a consequence, endurance athletes are considered to be partially heat acclimatized. It is therefore important to understand the extent to which endurance trained individuals may benefit from heat acclimation by post-exercise HWI. To this end, we compared the responses of eight endurance trained and eight recreationally active males (habitual weekly endurance exercise: 9 h vs. 3 h) to a 6-day intervention involving a daily treadmill run for 40 min (65% O2max) in temperate conditions followed immediately by HWI (≤40 min, 40°C). Before (PRE) and after the intervention (POST), hallmark heat acclimation adaptations were assessed during a 40-min treadmill run at 65% O2max in the heat (33°C, 40% RH). The 6 day, post-exercise HWI intervention induced heat acclimation adaptations in both endurance trained and recreationally active individuals. Training status did not significantly influence the magnitude of heat acclimation adaptations from PRE to POST (interactions P > 0.05) for: the reduction in end-exercise rectal core temperature (T re, mean, endurance trained -0.36°C; recreationally active -0.47°C); the reduction in resting T re (endurance trained -0.17°C; recreationally active -0.23°C); the reduction in T re at sweating onset (endurance trained -0.22°C; recreationally active -0.23°C); and, the reduction in mean skin temperature (endurance trained -0.67°C; recreationally active -0.75°C: PRE to POST P < 0.01). Furthermore, training status did not significantly influence the observed reductions in mean O2, mean metabolic energy expenditure, end-exercise physiological strain index, perceived exertion or thermal sensation (PRE to POST P < 0.05). Only end-exercise heart rate was influenced by training status (P < 0.01, interaction); whereby, recreationally active but not endurance trained individuals experienced a significant reduction in end-exercise heart rate from PRE to POST (P < 0.01). In summary, these findings demonstrate that post-exercise HWI presents a practical strategy to reduce thermal strain during exercise-heat-stress in endurance trained and recreationally active individuals.

Authors+Show Affiliations

Extremes Research Group, College of Human Sciences, Bangor University, Bangor, United Kingdom.Extremes Research Group, College of Human Sciences, Bangor University, Bangor, United Kingdom.Extremes Research Group, College of Human Sciences, Bangor University, Bangor, United Kingdom.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30618833

Citation

Zurawlew, Michael J., et al. "Post-exercise Hot Water Immersion Elicits Heat Acclimation Adaptations in Endurance Trained and Recreationally Active Individuals." Frontiers in Physiology, vol. 9, 2018, p. 1824.
Zurawlew MJ, Mee JA, Walsh NP. Post-exercise Hot Water Immersion Elicits Heat Acclimation Adaptations in Endurance Trained and Recreationally Active Individuals. Front Physiol. 2018;9:1824.
Zurawlew, M. J., Mee, J. A., & Walsh, N. P. (2018). Post-exercise Hot Water Immersion Elicits Heat Acclimation Adaptations in Endurance Trained and Recreationally Active Individuals. Frontiers in Physiology, 9, 1824. https://doi.org/10.3389/fphys.2018.01824
Zurawlew MJ, Mee JA, Walsh NP. Post-exercise Hot Water Immersion Elicits Heat Acclimation Adaptations in Endurance Trained and Recreationally Active Individuals. Front Physiol. 2018;9:1824. PubMed PMID: 30618833.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Post-exercise Hot Water Immersion Elicits Heat Acclimation Adaptations in Endurance Trained and Recreationally Active Individuals. AU - Zurawlew,Michael J, AU - Mee,Jessica A, AU - Walsh,Neil P, Y1 - 2018/12/18/ PY - 2018/11/01/received PY - 2018/12/06/accepted PY - 2019/1/9/entrez PY - 2019/1/9/pubmed PY - 2019/1/9/medline KW - acclimation KW - heat KW - hot water KW - running KW - thermal strain KW - training SP - 1824 EP - 1824 JF - Frontiers in physiology JO - Front Physiol VL - 9 N2 - Hot water immersion (HWI) after exercise on 6 consecutive days in temperate conditions has been shown to provide heat acclimation adaptations in a recreationally active population. Endurance athletes experience frequent, sustained elevations in body temperature during training and competition; as a consequence, endurance athletes are considered to be partially heat acclimatized. It is therefore important to understand the extent to which endurance trained individuals may benefit from heat acclimation by post-exercise HWI. To this end, we compared the responses of eight endurance trained and eight recreationally active males (habitual weekly endurance exercise: 9 h vs. 3 h) to a 6-day intervention involving a daily treadmill run for 40 min (65% O2max) in temperate conditions followed immediately by HWI (≤40 min, 40°C). Before (PRE) and after the intervention (POST), hallmark heat acclimation adaptations were assessed during a 40-min treadmill run at 65% O2max in the heat (33°C, 40% RH). The 6 day, post-exercise HWI intervention induced heat acclimation adaptations in both endurance trained and recreationally active individuals. Training status did not significantly influence the magnitude of heat acclimation adaptations from PRE to POST (interactions P > 0.05) for: the reduction in end-exercise rectal core temperature (T re, mean, endurance trained -0.36°C; recreationally active -0.47°C); the reduction in resting T re (endurance trained -0.17°C; recreationally active -0.23°C); the reduction in T re at sweating onset (endurance trained -0.22°C; recreationally active -0.23°C); and, the reduction in mean skin temperature (endurance trained -0.67°C; recreationally active -0.75°C: PRE to POST P < 0.01). Furthermore, training status did not significantly influence the observed reductions in mean O2, mean metabolic energy expenditure, end-exercise physiological strain index, perceived exertion or thermal sensation (PRE to POST P < 0.05). Only end-exercise heart rate was influenced by training status (P < 0.01, interaction); whereby, recreationally active but not endurance trained individuals experienced a significant reduction in end-exercise heart rate from PRE to POST (P < 0.01). In summary, these findings demonstrate that post-exercise HWI presents a practical strategy to reduce thermal strain during exercise-heat-stress in endurance trained and recreationally active individuals. SN - 1664-042X UR - https://www.unboundmedicine.com/medline/citation/30618833/Post_exercise_Hot_Water_Immersion_Elicits_Heat_Acclimation_Adaptations_in_Endurance_Trained_and_Recreationally_Active_Individuals_ L2 - https://doi.org/10.3389/fphys.2018.01824 DB - PRIME DP - Unbound Medicine ER -
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