| Thermoeffector thresholds and preferred ambient temperatures of the FOK rat. | |
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MedLine Citation:
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PMID: 9530224 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The FOK is an inbred rat strain with a genotypic adaptation to hot environments. The present study compared the thermoeffector thresholds and preferred ambient temperatures (Tpref) of the FOK rat with those of other rat strains. Male FOK, WKAH, and Donryu rats were used. First, they were loosely restrained and placed individually in a metabolic chamber with an ambient temperature of 26.0 degrees C. Their hypothalamic temperature (T(hy)), tail skin temperature (Tsk), and heat production (M) were measured. After thermal equilibrium had been attained, the rats were gradually warmed and then cooled using an intravenous thermode. The threshold T(hy) values for tail skin vasodilation and cold-induced thermogenesis were defined as the points at which sharp increases in Tsk and M occurred, respectively. The two thresholds of the FOK rat were lower than those of the WKAH and Donryu rats. In a second set of experiments, the FOK and WKAH rats were placed individually in a thermocline. Their intra-abdominal temperatures (T(ab)) were measured by a biotelemetry system, and the rats' Tpref values were estimated with the thermal gradient. Mean T(ab) and Tpref over a 24-h period for the FOK rat were significantly lower than those of the WKAH rat. The results suggest that in the FOK rat the control ranges of autonomic and behavioral thermoregulation are lower than those of the other rat strains examined. This contributes to the maintenance of core temperature at low levels. |
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Authors:
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O Shido; S Sakurada; N Sugimoto; F Furuyama; T Nagasaka |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The American journal of physiology Volume: 274 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1998 Mar |
Date Detail:
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Created Date: 1998-04-14 Completed Date: 1998-04-14 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: R604-9 Citation Subset: IM |
Affiliation:
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Department of Physiology, School of Medicine, Faculty of Medicine, Kanazawa University, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Behavior, Animal / physiology Body Temperature Body Temperature Regulation* Hot Temperature Hypothalamus / physiology Male Rats Rats, Inbred Strains / physiology* Tail |
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