| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
|
|
|
|||||||
|
|||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1 Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas, TX, USA
2 Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, 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, Dallas, TX, USA
* To whom correspondence should be addressed. E-mail: CraigCrandall{at}texashealth.org.
The purpose of this study was to identify if baroreceptor unloading was responsible for less efficient heat loss responses (i.e., skin blood flow and sweat rate) previously reported during inactive compared to active recovery following upright cycle exercise (Carter, et al., J Appl Physiol, 93:1918-29, 2002). Eight healthy adults performed two 15-minute bouts of supine cycle exercise (65 rpm at 65% of maximum heart rate) followed by inactive or active (no load pedaling at 65 rpm) supine recovery. Core temperature (Tcore; telemetry pill), mean skin temperature (Tsk), heart rate (HR), mean arterial blood pressure (MAP), thoracic impedance, central venous pressure (CVP; n=4), cutaneous vascular conductance (CVC; laser-Doppler flux.MAP-1 expressed as percent of maximal vasodilation), and sweat rate were measured throughout exercise and during 5 min of recovery. Exercise bouts were similar in power output, HR, Tcore, and Tsk. Baroreceptor loading and thermal status were similar during trials as MAP (90±4, 88±4 mmHg), thoracic impedance (29±1, 28±2 
), CVP (5±1, 4±1 mmHg), Tcore (37.5±0.1, 37.5±0.1° C), and Tsk (34.1±0.3, 34.2±0.2° C) were not significantly different at 3 min of recovery between active and inactive recoveries, respectively; all P > 0.05. At 3 min of recovery, chest CVC was not significantly different between active (25±6 %max) and inactive (28±6 %max; P > 0.05) recovery. In contrast, at this time point, chest sweat rate was higher during active (0.45±0.16 mg.cm2.min-1) compared to inactive (0.34±0.19 mg.cm2.min-1; P < 0.05) recovery. Following exercise CVC and sweat rate are differentially controlled. In the background of an increase in body temperature, CVC is primarily influenced by baroreceptor loading status while sweat rate is influenced by other factors.
This article has been cited by other articles:
|
|
 |
|
  O. Jay, D. Gagnon, M. B. DuCharme, P. Webb, F. D. Reardon, and G. P. Kenny Human heat balance during postexercise recovery: separating metabolic and nonthermal effects Am J Physiol Regulatory Integrative Comp Physiol, May 1, 2008; 294(5): R1586 - R1592. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. P. Kenny and O. Jay Sex differences in postexercise esophageal and muscle tissue temperature response Am J Physiol Regulatory Integrative Comp Physiol, April 1, 2007; 292(4): R1632 - R1640. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. M. Lynn, J. L. McCord, and J. R. Halliwill Effects of the menstrual cycle and sex on postexercise hemodynamics Am J Physiol Regulatory Integrative Comp Physiol, March 1, 2007; 292(3): R1260 - R1270. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 N. H. McInnis, W. S. Journeay, O. Jay, E. Leclair, and G. P. Kenny 15{degrees} Head-down tilt attenuates the postexercise reduction in cutaneous vascular conductance and sweating and decreases esophageal temperature recovery time J Appl Physiol, September 1, 2006; 101(3): 840 - 847. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. P. Kenny, J. E. Murrin, W. S. Journeay, and F. D. Reardon Differences in the postexercise threshold for cutaneous active vasodilation between men and women Am J Physiol Regulatory Integrative Comp Physiol, January 1, 2006; 290(1): R172 - R179. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. s. Journeay, F. D. Reardon, N. H. McInnis, and G. P. Kenny Nonthermoregulatory control of cutaneous vascular conductance and sweating during recovery from dynamic exercise in women J Appl Physiol, November 1, 2005; 99(5): 1816 - 1821. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. W. Wilkins, C. T. Minson, and J. R. Halliwill Regional hemodynamics during postexercise hypotension. II. Cutaneous circulation J Appl Physiol, December 1, 2004; 97(6): 2071 - 2076. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Shibasaki, M. Sakai, M. Oda, and C. G. Crandall Muscle mechanoreceptor modulation of sweat rate during recovery from moderate exercise J Appl Physiol, June 1, 2004; 96(6): 2115 - 2119. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. S. Journeay, F. D. Reardon, C. R. Martin, and G. P. Kenny Control of cutaneous vascular conductance and sweating during recovery from dynamic exercise in humans J Appl Physiol, June 1, 2004; 96(6): 2207 - 2212. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| Visit Other APS Journals Online |
