HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) All Versions of this Article: 291/3/R580    most recent 00918.2005v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (9) Citing Articles via Google Scholar Google Scholar Articles by Kenny, G. P. Articles by Reardon, F. D. Search for Related Content PubMed PubMed Citation Articles by Kenny, G. P. Articles by Reardon, F. D.

CALL FOR PAPERS
Physiology and Pharmacology of Temperature Regulation

Postexercise hypotension causes a prolonged perturbation in esophageal and active muscle temperature recovery

¹Faculty of Health Sciences, School of Human Kinetics, and ²Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada; ³London Health Sciences Centre, London, Ontario, Canada; and ⁴Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada

Submitted 29 December 2005 ; accepted in final form 25 February 2006

We examined the effect of two levels of exercise-induced hypotension on esophageal (T_es) and active and nonactive muscle temperatures during and following exercise. Seven males performed an incremental isotonic test on a Kin-Com isokinetic apparatus to determine their peak oxygen consumption during bilateral knee extensions (O_2sp). This was followed on separate days by 15-min of isolated bilateral knee extensions at moderate (60% O_2sp) (MEI) and high (80% O_2sp) (HEI) exercise intensities, followed by 90 min of recovery. Muscle temperature was measured with an intramuscular probe inserted in the left vastus medialis (T_vm) and triceps brachii (T_tb) muscles under ultrasound guidance. The deepest sensor (tip) was located 10 mm from the femur and deep femoral artery and from the superior ulnar collateral artery and humerus for the T_vm and T_tb, respectively. Additional sensors were located 15 and 30 mm from the tip with an additional sensor located at 45 mm for the T_vm measurements only. Following exercise, mean arterial pressure (MAP) remained significantly below preexercise rest for the initial 60 min of recovery after MEI and for the duration of the postexercise recovery period after HEI (P 0.05). After HEI, significantly greater elevations from preexercise rest were recorded for T_es and all muscle temperatures paralleled a greater decrease in MAP compared with MEI (all P 0.05). By the end of 90-min postexercise recovery, MAP, T_es, and all muscle temperatures remained significantly greater after HEI than MEI. Furthermore, a significantly shallower muscle temperature profile across T_vm, relative to preexercise rest, was observed at the end of exercise for both HEI and MEI (P 0.05), and for 30 min of recovery for MEI and throughout 90 min of recovery for HEI. No significant differences in muscle temperature profile were observed for T_tb. Thus we conclude that the increase in the postexercise hypotensive response, induced by exercise of increasing intensity, was paralleled by an increase in the magnitude and recovery time of the postexercise esophageal and active muscle temperatures.

heat load; thermoregulation; hyperthermia; heat content; and heat balance

This article has been cited by other articles:

				G. P. Kenny, E. Leclair, R. J. Sigal, W. S. Journeay, D. Kilby, L. Nettlefold, F. D. Reardon, and O. Jay Menstrual cycle and oral contraceptive use do not modify postexercise heat loss responses J Appl Physiol, October 1, 2008; 105(4): 1156 - 1165. [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]

				A. A. Romanovsky Thermoregulation: some concepts have changed. Functional architecture of the thermoregulatory system Am J Physiol Regulatory Integrative Comp Physiol, January 1, 2007; 292(1): R37 - R46. [Abstract] [Full Text] [PDF]

				O. Jay, L. M. Gariepy, F. D. Reardon, P. Webb, M. B. Ducharme, T. Ramsay, and G. P. Kenny A three-compartment thermometry model for the improved estimation of changes in body heat content Am J Physiol Regulatory Integrative Comp Physiol, January 1, 2007; 292(1): R167 - R175. [Abstract] [Full Text] [PDF]

				P. B. Persson Temperature control: from molecular insights, regulation in king penguins and diving seals, to studies in humans Am J Physiol Regulatory Integrative Comp Physiol, September 1, 2006; 291(3): R512 - R514. [Full Text] [PDF]