An evaluation of the role of skin temperature during heat adaptation

Acta Physiologica Scandinavica
J M ReganN A Taylor

Abstract

This project sought to evaluate the importance of skin temperature during heat acclimation, using an isothermal-strain model. Two groups of seven matched males, participated (1 h per day, 10 days) in one of two conditions: (i) temperate physical training (TEMP: 22.4 +/- 0.7 degrees C, relative humidity (r.h.) 41.0 +/- 0.9%); or (ii) combined physical training and heat acclimation (HEAT: 38.2 +/- 0.7 degrees C, r.h. 39.7 +/- 1.3%). Isothermal strain was induced in both groups by rapidly elevating rectal temperature by 1 degree C (cycling), then holding it constant by manipulating external work. Subjects completed two three-phase heat stress tests (39.8 +/- 0.1 degrees C, r.h. 38.6 +/- 1.2), consisting of 20 min rest, then 20 min cycling at each of 30% and 45% of peak power, before and after each regimen. While there was a difference of 4.2 degrees C in mean skin temperature between treatments, both regimens elicited a similar peripheral sudomotor increase, indicating a core temperature dependent adaptation. However, based on significant pre- vs. post-acclimation decreases in average auditory canal temperature (0.4 +/- 0.1 degree C), average forehead skin blood flow (26%), average perceived exertion (11%), and a 5% increase in av...Continue Reading

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