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1 School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada; Ottawa Health Research Institute, Ottawa, Ontario, Canada
2 School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
* To whom correspondence should be addressed. E-mail: gkenny{at}uottawa.ca.
The hypothesis that the magnitude of the postexercise onset threshold for sweating is increased by the intensity of exercise was tested in eight subjects. Esophageal temperature was monitored as an index of core temperature while sweat rate was measured using a ventilated capsule placed on the upper back. Subjects remained seated resting for 15 min (no-exercise) or performed 15 min treadmill running at either 55, 70 or 85% of VO2peak followed by 20 min seated recovery. Subjects then donned a liquid-conditioned suit used to regulate mean skin temperature. The suit was first perfused with 20°C water to control and stabilize skin and core temperature before whole body heating. Subsequently the skin was heated (~4.0°C/hr) until sweating occurred. Exercise resulted in an increase in the onset threshold for sweating of 0.11 ± 0.02, 0.23 ± 0.01 and 0.33 ± 0.02°C above that measured for the no-exercise resting values (P < 0.05) for the 55, 70 and 85% of VO2peak exercise conditions respectively. We did note that there was a greater postexercise hypotension as a function of exercise intensity as measured at the end of the 20 min exercise recovery. Thus, it is plausible that the increase in postexercise threshold may be related to postexercise hypotension. It is concluded that the sweating response during upright recovery is significantly modified by exercise intensity and may likely be influenced by the non-thermal baroreceptor reflex adjustments postexercise.
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