Document Detail


Ventilatory acclimatization in awake guinea pigs raised at high altitude.
MedLine Citation:
PMID:  15705538     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To determine if laboratory strains of guinea pigs bred at sea level (SL) are "pre-adapted" to high altitude (HA), we raised litter-matched weanling Hartley guinea pigs for 4 months at SL, intermediate altitude (IA, 1250 m) or HA (3800 m) and exposed them acutely to 100, 21 and 12% inspired O2 at their respective altitude of residence. Control animals raised at SL were also exposed acutely to 10 and 8% inspired O2. In awake spontaneously breathing guinea pigs raised at SL, resting minute ventilation and tidal volume increased significantly when inspired O2 tension fell below about 60 mm Hg. In guinea pigs raised at IA or HA, ventilation was higher at any given inspired O2 tension in direct relationship to the altitude of residence. Resting hematocrit was also higher in animals raised at HA than at SL. We conclude that the pattern of ventilatory acclimatization to HA exposure in Hartley guinea pigs is similar to that in laboratory rats and human lowlanders; therefore laboratory guinea pigs are not pre-adapted and are suitable animals for the study of adaptation to high altitude.
Authors:
Cuneyt Yilmaz; Deborah C Hogg; Priya Ravikumar; Connie C W Hsia
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Respiratory physiology & neurobiology     Volume:  145     ISSN:  1569-9048     ISO Abbreviation:  Respir Physiol Neurobiol     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-02-11     Completed Date:  2005-05-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101140022     Medline TA:  Respir Physiol Neurobiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  235-42     Citation Subset:  IM    
Affiliation:
Department of Internal Medicine, Pulmonary and Critical Care Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9034, USA.
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MeSH Terms
Descriptor/Qualifier:
Acclimatization / physiology*
Altitude*
Analysis of Variance
Animals
Anoxia / physiopathology*
Guinea Pigs
Hematocrit / methods
Male
Pulmonary Ventilation / physiology
Respiration*
Respiratory Function Tests / methods
Tidal Volume / physiology
Time Factors
Wakefulness

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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