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Articles in PresS, published online ahead of print August 16, 2002
J Appl Physiol, 10.1152/jap.00056.2002
Submitted on January 22, 2002
Accepted on August 8, 2002
1 Department of Integrative Physiology & Cardiovascular Research Institute, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, USA
2 Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas, TX, USA
3 Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas, TX, USA; Department of Internal Medicine, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, USA
* To whom correspondence should be addressed. E-mail: craig.crandall{at}UTSouthwestern.edu.
To identify the effects of exercise recovery mode on cutaneous vascular conductance (CVC) and sweat rate, 8 healthy adults performed two 15-min bouts of upright cycle ergometry at 60% maximal heart rate followed by either inactive or active (loadless pedaling) recovery. An index of CVC was calculated from the ratio of laser Doppler flux to mean arterial pressure. CVC was then expressed as a percent of maximum as determined from local heating. At 3 min post-exercise, CVC (chest: 40 ± 3, forearm: 48 ± 3%max) during active recovery was greater when compared to inactive recovery (chest: 21 ± 2, forearm: 25 ± 4%max); all p<0.05. Moreover, at the same time point sweat rate (chest: 0.47 ± 0.10, forearm: 0.46 ± 0.10 mg/cm2/min) was greater during active when compared to inactive recovery (chest: 0.28 ± 0.10, forearm: 0.14 ± 0.20 mg/cm2.min), all p<0.05. Mean blood pressure, esophageal temperature, nor skin temperature were different between recovery modes. These data suggest that skin blood flow and sweat rate during recovery from exercise may be modulated by non-thermoregulatory mechanisms, and that sustained elevations in skin blood flow and sweat rate during mild active recovery may be important for post-exertional heat dissipation.
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