Document Detail

Deer mouse aerobic performance across altitudes: effects of developmental history and temperature acclimation.
MedLine Citation:
PMID:  17910001     Owner:  NLM     Status:  MEDLINE    
Aerobic physiology at high altitudes has been studied in many animals. Prior work on laboratory-bred deer mice (a species with a wide altitudinal range) showed depression of aerobic capacity at high altitude, even after acclimation. However, wild deer mice show no reduction in thermogenic performance at high altitude, and performance limits seem to be due to physiological and anatomical adjustments to environmental temperature and not to oxygen availability. We asked whether across-altitude performance differences exist in deer mice after accounting for temperature acclimation (approximately 5 degrees and 20 degrees -25 degrees C) and prenatal and neonatal development altitude (340 vs. 3,800 m). We measured maximal thermogenic oxygen consumption (VO2sum) in cold exposure and ran mice on a treadmill to elicit maximal exercise oxygen consumption (VO2max). We found a 10% reduction in VO2max at 3,800 m compared with that at 340 m; thus, the mice were able to compensate for most of the 37% reduction in oxygen availability at the higher altitude. Development altitude did not affect VO2max. There was no effect of test altitude or development altitude on VO2sum in warm-acclimated animals, but both test and development altitude strongly affected VO2sum in cold-acclimated mice, and compensation for hypoxia at 3,800 m was considerably less than that for exercise.
Mark A Chappell; Kimberly A Hammond; Richard A Cardullo; Gregory A Russell; Enrico L Rezende; Catherine Miller
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2007-09-06
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  80     ISSN:  1522-2152     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2007 Nov-Dec
Date Detail:
Created Date:  2007-10-02     Completed Date:  2007-12-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  652-62     Citation Subset:  IM    
Department of Biology, University of California, Riverside, California 92521, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Acclimatization / physiology*
Body Weight
Oxygen Consumption
Peromyscus / physiology*

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

Previous Document:  An energy-based body temperature threshold between torpor and normothermia for small mammals.
Next Document:  Carotenoid coloration in greenfinches is individually consistent irrespective of foraging ability.