| Metabolic adjustments during adaptation to high ambient temperature by preoptic-lesioned rats. | |
| | |
MedLine Citation:
|
PMID: 1823008 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Metabolic adjustment was studied in male Wistar rats weighing 180-200 g with bilateral electrolytic lesions in the preoptic area which were acclimatized to a hot environment (34 degrees C, 30 rats) and to normal temperature (25 degrees C, 20 rats) for 60 days. Oxygen consumption at 34 degrees C and body weight were measured periodically. Preoptic-lesioned rats (PO rats) showed a reduction in metabolic rate (from 46.2 +/- 2 to 33 +/- 2 Cal/m2 per h, P less than 0.05) regardless of the temperatures to which they were adapted. Although the reduced metabolic rate of PO rats living at 25 degrees C or 34 degrees C could be an indicator of adaptation to heat, only the PO rats living at 25 degrees C showed a weight gain (101 +/- 13 g) similar to that observed for the sham-operated control (75 +/- 11 g). In fact, the PO rats living at 34 degrees C failed to increase their body weight during 60 days of exposure to heat. These data indicate that the preoptic area is essential to integrate the thermal input with the energy-linked metabolic process involved in adaptation to hot environments. |
| | |
Authors:
|
G L Santos; J V Leite; C C Coimbra |
Related Documents
:
|
7091398 - Increased heat loss in ovariectomized hypothyroid rats treated with estradiol. 10811378 - Vascular resistance in the rat during baseline, chronic total sleep deprivation, and re... 22462048 - Respiration restitution in rats following its termination in immersion hypothermia. 4020488 - Effect of ambient temperature on the energy requirements of the lactating rat. 10797558 - Metabolic stress in pc12 cells induces the formation of the endogenous dopaminergic neu... 17475818 - Genes expressed by both mesangial cells and bone marrow-derived cells underlie genetic ... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Brazilian journal of medical and biological research = Revista brasileira de pesquisas médicas e biológicas / Sociedade Brasileira de Biofísica ... [et al.] Volume: 24 ISSN: 0100-879X ISO Abbreviation: Braz. J. Med. Biol. Res. Publication Date: 1991 |
Date Detail:
|
Created Date: 1992-09-17 Completed Date: 1992-09-17 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 8112917 Medline TA: Braz J Med Biol Res Country: BRAZIL |
Other Details:
|
Languages: eng Pagination: 1169-72 Citation Subset: IM |
Affiliation:
|
Departamento de Fisiologia, Universidade Federal do Pará, Belém, Brasil. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adaptation, Physiological* Animals Body Weight Energy Metabolism Hot Temperature* Male Oxygen Consumption / physiology* Preoptic Area / physiology* Rats Rats, Inbred Strains |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Evidence for adrenal medulla involvement in cold adaptation of preoptic-lesioned rats.
Next Document: The electrocardiogram of rats with an old extensive myocardial infarction.