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1 School of Human Kinetics, Human Performance and Environmental Medicine Research Laboratory, University of Ottawa, Ottawa, Ontario, Canada
* To whom correspondence should be addressed. E-mail: gkenny{at}uottawa.ca.
We evaluated post-exercise venous pooling as a factor leading to previously reported increases in the post-exercise esophageal temperature threshold for cutaneous vasodilation (ThVD) and sweating (ThSW). Six subjects were randomly exposed to lower body positive pressure (with LBPP) and to no lower body positive pressure (without LBPP) following an exercise and no-exercise treatment protocol. The exercise treatment consisted of 15 min of upright cycling at 65% of VO2peak and the no-exercise treatment consisted of 15 min upright seated rest. Immediately following either treatment, subjects donned a liquid conditioned suit (LCS) used to regulate mean skin temperature and then were positioned within an upright LBPP chamber. The LCS was first perfused with 20°C water in order to control and stabilize skin and core temperature prior to whole body heating. Subsequently the skin was heated (~4.0°C.hr-1) until cutaneous vasodilation and sweating occurred. Forearm skin blood flow and arterial blood pressure were measured non-invasively and used to calculate cutaneous vascular conductance during whole-body heating. Sweat rate response was estimated from a 5.0 cm2 ventilated capsule placed on the upper back. Post-exercise ThVD and ThSW were both significantly elevated (0.27±0.04°C and 0.25±0.03°C respectively) as compared to the no-exercise trial without LBPP (P < 0.05). However, the post-exercise increases in both ThVD and ThSW were reversed with the application of LBPP. Our results support the hypothesis that the post-exercise warm thermal response of cutaneous vasodilation and sweating are attenuated by baroreceptor modulation via lower body venous pooling.
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