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McIntyre, RD, Zurawlew, MJ, Mee, JA, Walsh, NP and Oliver, SJ (2022) A comparison of medium-term heat acclimation by post-exercise hot water immersion or exercise in the heat: Adaptations, overreaching, and thyroid hormones. American journal of physiology. Regulatory, integrative and comparative physiology, 323 (5). R601-R615. ISSN 0363-6119
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Abstract
This research compared thermal and perceptual adaptations, endurance capacity, and overreaching markers in men after 3, 6, and 12-days of post-exercise hot water immersion (HWI) or exercise heat acclimation (EHA) with a temperate exercise control (CON), and examined thyroid hormones as a mechanism for the reduction in resting and exercising core temperature (Tre) after HWI. HWI involved a treadmill run at 65% V̇O2peak in 19°C followed by a 40°C bath. EHA and CON involved a work-matched treadmill run at 65% V̇O2peak in 33°C or 19°C, respectively. Compared with CON, resting mean body temperature (Tb), resting and end-exercise Tre, Tre at sweating onset, thermal sensation and perceived exertion were lower and whole-body sweat rate (WBSR) was higher after 12-days of HWI (all P ≤ 0.049, resting Tb: CON -0.11 ± 0.15°C, HWI -0.41 ± 0.15°C). Moreover, resting Tb and Tre at sweating onset were lower after HWI than EHA (P ≤ 0.015, resting Tb: EHA -0.14 ± 0.14°C). No differences were identified between EHA and CON (P ≥ 0.157) except WBSR which was greater after EHA (P = 0.013). No differences were observed between interventions for endurance capacity or overreaching markers (mood, sleep, Stroop, P ≥ 0.190). Thermal adaptations observed after HWI were not related to changes in thyroid hormone concentrations (P ≥ 0.086). In conclusion, 12-days of post-exercise hot water immersion conferred more complete heat acclimation than exercise heat acclimation without increasing overreaching risk, and changes in thyroid hormones are not related to thermal adaptationsafter post-exercise hot water immersion.
| Item Type: | Article |
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| Uncontrolled Keywords: | core temperature; hot bath; thermoregulation; thyroxine; triiodothyronine; 06 Biological Sciences; 11 Medical and Health Sciences; Physiology |
| Subjects: | R Medicine > RC Internal medicine > RC1200 Sports Medicine |
| Divisions: | Sport & Exercise Sciences |
| Publisher: | American Physiological Society |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 15 Sep 2022 11:00 |
| Last Modified: | 18 Nov 2022 11:45 |
| DOI or ID number: | 10.1152/ajpregu.00315.2021 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/17582 |
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