Journal of Applied Physiology Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 83: 837-844, 1997;
8750-7587/97 $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 Eliason, H. L.
Right arrow Articles by Fewell, J. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Eliason, H. L.
Right arrow Articles by Fewell, J. E.

Journal of Applied Physiology
Vol. 83, No. 3, pp. 837-844, September 1997
CONTROL OF BREATHING, CIRCULATION, AND TEMPERATURE

Thermoregulatory control during pregnancy and lactation in rats

Heather L. Eliason and James E. Fewell

Department of Physiology and Biophysics, The University of Calgary, Health Sciences Centre, Calgary, Alberta T2N 4N1, Canada

Received 6 December 1996; accepted in final form 22 April 1997.

Eliason, Heather L., and James E. Fewell. Thermoregulatory control during pregnancy and lactation in rats. J. Appl. Physiol. 83(3): 837-844, 1997.---Although the mechanisms remain unknown, maternal core temperature (Tc) decreases near term of pregnancy and is increased throughout lactation in rats. The purpose of our present experiments was to determine whether pregnancy and lactation shift the thermoneutral zone of rats and to investigate whether the changes in maternal Tc during pregnancy and lactation result from "forced" or "regulated" thermoregulatory responses. Conscious, chronically instrumented nonpregnant and pregnant and lactating rats were studied both in a thermocline (a chamber with a linear temperature gradient from 12 to 36°C) and in a metabolic chamber to determine the influence of pregnancy and lactation on selected ambient temperature as well as the thermoregulatory response to changes in ambient temperature. We found that selected ambient temperature, oxygen consumption, and thermal conductance did not change in rats studied in a thermocline as Tc decreased near term of pregnancy. There was, however, a downward shift in the thermoneutral zone of rats studied in a metabolic chamber near term of pregnancy. During lactation, selected ambient temperature decreased in rats studied in a thermocline as oxygen consumption and Tc increased. The thermoneutral zone of lactating rats was not different from that of nonpregnant animals. Thus our data provide evidence that the decrease in Tc near term of pregnancy in rats results from a regulated thermoregulatory response, whereas the increase in Tc during lactation results from a forced thermoregulatory response.

autonomic thermoregulation; behavioral thermoregulation

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




This article has been cited by other articles:


Home page
 Exp PhysiolHome page
S. L. Moore and J. E. Fewell
Mifepristone (RU38486) influences the core temperature response of term pregnant rats to intraperitoneal lipopolysaccharide
Exp Physiol, July 1, 2006; 91(4): 741 - 746.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
A. Fuller, P. R. Kamerman, S. K. Maloney, A. Matthee, G. Mitchell, and D. Mitchell
A year in the thermal life of a free-ranging herd of springbok Antidorcas marsupialis
J. Exp. Biol., August 1, 2005; 208(15): 2855 - 2864.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
M. J. Cairns, P. Burns, R. Di Nicolantonio, M. J. McKinley, and M. L. Mathai
Influence of brain angiotensin on thermoregulation and hydromineral balance during pregnancy in rats
J Appl Physiol, May 1, 2005; 98(5): 1813 - 1819.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
E. Krol and J. R. Speakman
Limits to sustained energy intake VI. Energetics of lactation in laboratory mice at thermoneutrality
J. Exp. Biol., December 1, 2003; 206(23): 4255 - 4266.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
E. Krol, M. S. Johnson, and J. R. Speakman
Limits to sustained energy intake VIII. Resting metabolic rate and organ morphology of laboratory mice lactating at thermoneutrality
J. Exp. Biol., December 1, 2003; 206(23): 4283 - 4291.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. E. Fewell, H. L. Eliason, and R. N. Auer
Peri-OVLT E-series prostaglandins and core temperature do not increase after intravenous IL-1beta in pregnant rats
J Appl Physiol, August 1, 2002; 93(2): 531 - 536.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
H. L. Eliason and J. E. Fewell
Arginine vasopressin does not mediate the attenuated febrile response to intravenous IL-1beta in pregnant rats
Am J Physiol Regulatory Integrative Comp Physiol, February 1, 1999; 276(2): R450 - R454.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
H. L. Eliason and J. E. Fewell
AVP mediates the attenuated febrile response to administration of PGE1 in rats near term of pregnancy
Am J Physiol Regulatory Integrative Comp Physiol, September 1, 1998; 275(3): R691 - R696.
[Abstract] [Full Text] [PDF]


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