Short-term hot water immersion results in substantial thermal strain and partial heat acclimation; comparisons with heat-exercise exposures
| Autor: | William R. Boyer, Felipe Gorini Pereira, Trevor Gillum, Marc R. Apkarian, Matthew R. Kuennen, Andrew M. Greenfield |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Hyperthermia Adult Male Hot Temperature Physiology 030310 physiology Acclimatization Thermal strain 010603 evolutionary biology 01 natural sciences Biochemistry Body Temperature 03 medical and health sciences Young Adult Animal science Heat illness Heat acclimation Heart Rate Immersion medicine Humans Plasma Volume 0303 health sciences Cross-Over Studies Chemistry Water Thermoregulation medicine.disease Heat stress Bicycling Water immersion General Agricultural and Biological Sciences Heat-Shock Response Developmental Biology |
| Zdroj: | Journal of thermal biology. 97 |
| ISSN: | 0306-4565 |
| Popis: | Objective To examine the effectiveness of hot water immersion (HWI) as a heat acclimation strategy in comparison to time and temperature matched, exercise-heat acclimation (EHA). Methods 8 males performed heat stress tests (HST) (45 min of cycling at 50% of VO2max in 40 °C, 40% RH) before and after heat acclimation sessions. Acclimation sessions were either three consecutive bouts of HWI (40 min of submersion at 40 °C) or EHA (40 min of cycling at 50% VO2max in 40 °C, 40% RH). Results Average change in tympanic temperature (TTympanic) was significantly higher following HWI (2.1 °C ± 0.4) compared to EHA (1.5 °C ± 0.4) (P 0.05). Peak rate of perceived exertion (RPEPeak) decreased for HWI and EHA (P 0.05). Plasma volume increased in both intervention groups (HWI: 5.9% ± 5.1; EHA: 5.4% ± 3.7) but was not statistically different (P > 0.05). Conclusion HWI induced significantly greater thermal strain compared to EHA at equivalent temperatures during time-matched exposures. However, the greater degree of thermal strain did not result in between intervention differences for cardiovascular, thermoregulatory, or perceptual variables. Findings suggest three HWI sessions may be a potential means to lower HR, TCore, and perceptual strain during exercise in the heat. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect