Journal of Applied Physiology AJP: Endocrinology and Metabolism
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 85: 1357-1361, 1998;
8750-7587/98 $5.00
This Article
Right arrow Full Text Free
Right arrow Full Text (PDF) Free
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Kenny, G. P.
Right arrow Articles by Giesbrecht, G. G.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Kenny, G. P.
Right arrow Articles by Giesbrecht, G. G.
Vol. 85, Issue 4, 1357-1361, October 1998

Moderate exercise increases postexercise thresholds for vasoconstriction and shivering

G. P. Kenny1, A. A. Chen2, B. A. Nurbakhsh2, P. M. Denis1, C. E. Proulx1, and G. G. Giesbrecht2

1 Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, Ontario K1N 6N5; and 2 Laboratory for Exercise and Environmental Medicine, Health, Leisure and Human Performance Research Institute, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

The purpose of this study was to evaluate the effect of exercise on the subsequent postexercise thresholds for vasoconstriction and shivering. On two separate days, with six subjects (3 women), a whole body water-perfused suit slowly decreased mean skin temperature (~7.0°C/h) until thresholds for vasoconstriction and shivering were clearly established. Subjects were then rewarmed by increasing water temperature until both esophageal and mean skin temperatures returned to near-baseline values. Subjects either performed 15 min of cycle ergometry (65% maximal O2 consumption) followed by 30 min of recovery (Exercise) or remained seated with no exercise for 45 min (Control). Subjects were then cooled again. We mathematically compensated for changes in skin temperatures by using the established linear cutaneous contribution of skin to the control of vasoconstriction and shivering (20%). The calculated core temperature threshold (at a designated skin temperature of 30.0°C) for vasoconstriction increased significantly from 36.64 ± 0.20 to 36.89 ± 0.22°C postexercise (P < 0.01). Similarly, the shivering threshold increased from 35.73 ± 0.13 to 36.13 ± 0.12°C postexercise (P < 0.01). In contrast, sequential measurements, without exercise, demonstrate a time-dependent decrease in both the vasoconstriction (0.10°C) and shivering (0.12°C) thresholds. These data indicate that exercise has a prolonged effect by increasing the postexercise thresholds for both cold thermoregulatory responses.

esophageal temperature; thermoregulation; heat loss


This article has been cited by other articles:


Home page
 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
D. W. DeGroot and W. L. Kenney
Impaired defense of core temperature in aged humans during mild cold stress
Am J Physiol Regulatory Integrative Comp Physiol, January 1, 2007; 292(1): R103 - R108.
[Abstract] [Full Text] [PDF]

Home page
 J. Physiol.Home page
K. Miki, M. Yoshimoto, and M. Tanimizu
Acute shifts of baroreflex control of renal sympathetic nerve activity induced by treadmill exercise in rats
J. Physiol., April 1, 2003; 548(1): 313 - 322.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
G. P. Kenny, D. N. Jackson, and F. D. Reardon
Acute head-down tilt decreases the postexercise resting threshold for forearm cutaneous vasodilation
J Appl Physiol, December 1, 2000; 89(6): 2306 - 2311.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. W. Castellani, A. J. Young, J. E. Kain, A. Rouse, and M. N. Sawka
Thermoregulation during cold exposure: effects of prior exercise
J Appl Physiol, July 1, 1999; 87(1): 247 - 252.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online