Intermittent exercise-heat exposures and intense physical activity sustain heat acclimation adaptations
| Autor: | Rachel M. VanScoy, Elizabeth L. Adams, Lesley W. Vandermark, Carl M. Maresh, Douglas J. Casa, Jeffrey M. Anderson, Larry E. Armstrong, Elaine C. Lee, Riana R. Pryor, J. Luke Pryor, Lindsay J. DiStefano |
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| Rok vydání: | 2019 |
| Předmět: |
Male
Hot Temperature Temperate environment business.industry Acclimatization Physical activity Sweating Physical Therapy Sports Therapy and Rehabilitation 030229 sport sciences Perceived exertion Thermoregulation 03 medical and health sciences 0302 clinical medicine Animal science Heat acclimation Heart Rate Heart rate Exercise intensity Humans Medicine Orthopedics and Sports Medicine 030212 general & internal medicine Strain index business Exercise |
| Zdroj: | Journal of Science and Medicine in Sport. 22:117-122 |
| ISSN: | 1440-2440 |
| DOI: | 10.1016/j.jsams.2018.06.009 |
| Popis: | Objectives To determine if intermittent exercise-heat exposures (IHE) every fifth day sustain heat acclimation (HA) adaptations 25 days after initial HA. Design Randomized control trial. Methods Sixteen non-heat acclimatized men heat acclimated during 10–11 days of exercise in the heat (40 °C, 40% RH). A heat stress test (120 min, 45% V ˙ O2peak) before (Pre HA) and after HA (Post HA) in similar hot conditions assessed HA status. Pair-matched participants were randomized into a control group (CON; n = 7) that exercised in a temperate environment (24 °C, 21%RH) or IHE group (n = 9) that exercised in a hot environment (40 °C, 40%RH) every fifth day for 25 days following HA (+25d) with out-of-laboratory exercise intensity and duration recorded. Both groups completed +25d in the hot condition. Results Both groups heat acclimated similarly (p > 0.05) evidenced by lower heart rate (HR), thermoregulatory, physiological, and perceptual responses (perceived exertion, fatigue, thermal sensation) Pre HA vs. Post HA (p ≤ 0.05). At +25d, post-exercise HR (p = 0.01) and physiological strain index (p Conclusions Exercise-heat exposures every fifth day for 25 days and regular intense physical activity after HA sustained HR and Tre adaptations and reduced perceptual and physiological strain during exercise-heat stress ∼1 month later. |
| Databáze: | OpenAIRE |
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