Main Title |
Twenty-Four Hour Rhythms of Selected Ambient Temperature in Rat and Hamster. |
Author |
Gordon, C. J. ;
|
CORP Author |
Health Effects Research Lab., Research Triangle Park, NC. Neurotoxicology Div. |
Publisher |
c1993 |
Year Published |
1993 |
Report Number |
EPA/600/J-93/103; |
Stock Number |
PB93-175727 |
Additional Subjects |
Rats ;
Hamsters ;
Circadian rhythm ;
Body temperature regulation ;
Motor activity ;
Animal behavior ;
Graphs(Charts) ;
Reprints ;
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB93-175727 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
9p |
Abstract |
The purpose of the study was to assess the effect of time of day on the behavioral thermoregulatory patterns of nocturnal rodents, the Long-Evans (LE) rat, Fischer 344 (F344) rat, and the golden hamster. Individual animals were placed in a temperature gradient for 4 days while selected ambient temperature (ST(sub a)) and motor activity (MA) were monitored. Food was provided at the cold and warm ends of the gradient and water was provided ad lib. All animals eventually showed a 24-h rhythm of ST(sub a) and MA characterized by a preference for cooler T(sub a)s during the dark period which coincided with an increase in MA. Both rat strains had ST(sub a)s of about 28 C during the light period that decreased to 22-24 C during the dark period. The F344 rat developed a ST(sub a) rhythm by the second day in the gradient, whereas the LE strain required 4 days. The hamster exhibited relatively warm ST(sub a)s of 32-33 C during the light period that decreased to 26-28 C during the dark period. The nocturnal preference for cooler ST(sub a)s contradicts a current concept of an elevation in set point of the thermoregulatory system. However, the data also suggest that behavioral and autonomic thermoregulatory effectors may operate independently in the control of night time elevations in body temperature. (Copyright (c) 1993 Pergamon Press Ltd.) |
Supplementary Notes |
Pub. in Physiology and Behavior, v53 n2 p257-263 Feb 93. See also PB92-124619. |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Twenty-Four Hour Rhythms of Selected Ambient Temperature in Rat and Hamster. |
Category Codes |
57S; 57Z |
NTIS Prices |
PC A02/MF A01 |
Primary Description |
600/10 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
314126898 |
Origin |
NTIS |
Type |
CAT |