Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8650572 | Physiology & Behavior | 2018 | 9 Pages |
Abstract
We tested the hypothesis that thermal behavior during the exercise recovery compensates for elevated core temperatures despite autonomic thermoeffector withdrawal. In a thermoneutral environment, 6 females and 6 males (22â¯Â±â¯1 y) cycled for 60â¯min (225â¯Â±â¯46â¯W metabolic heat production), followed by 60â¯min passive recovery. Mean skin and core temperatures, skin blood flow, and local sweat rate were measured continually. Subjects controlled the temperature of their dorsal neck to perceived thermal comfort using a custom-made neck device. Neck device temperature provided an index of thermal behavior. Mean body temperature, calculated as the average of mean skin and core temperatures, provided an index of the stimulus for thermal behavior. To isolate the independent effect of exercise on thermal behavior during recovery, data were analyzed post-exercise the exact minute mean body temperature recovered to pre-exercise levels within a subject. Mean body temperature returned to pre-exercise levels 28â¯Â±â¯20â¯min into recovery (Pre: 33.5â¯Â±â¯0.2, Post: 33.5â¯Â±â¯0.2â¯Â°C, Pâ¯=â¯0.20), at which point, mean skin temperature had recovered (Pre: 29.6â¯Â±â¯0.4, Post: 29.5â¯Â±â¯0.5â¯Â°C, Pâ¯=â¯0.20) and core temperature (Pre: 37.3â¯Â±â¯0.2, Post: 37.5â¯Â±â¯0.3â¯Â°C, Pâ¯=â¯0.01) remained elevated. Post-exercise, skin blood flow (Pre: 59â¯Â±â¯78, Post: 26 ± 25 PU, Pâ¯=â¯0.10) and local sweat rate (Pre: 0.05â¯Â±â¯0.25, Post: 0.13â¯Â±â¯0.14â¯mg/cm2â¯minâ1, Pâ¯=â¯0.09) returned to pre-exercise levels, while neck device temperature was depressed (Pre: 27.4â¯Â±â¯1.1, Post: 21.6â¯Â±â¯7.4â¯Â°C, Pâ¯=â¯0.03). These findings suggest that thermal behavior compensates for autonomic thermoeffector withdrawal in the presence of elevated core temperatures post-exercise.
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Authors
Nicole T. Vargas, Christopher L. Chapman, James R. Sackett, Jabril Abdul-Rashed, Muhamed McBryde, Blair D. Johnson, Rob Gathercole, Zachary J. Schlader,