Document Detail


Contributions to elevated metabolism during recovery: dissecting the excess postexercise oxygen consumption (EPOC) in the desert iguana (Dipsosaurus dorsalis).
MedLine Citation:
PMID:  18040968     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The excess postexercise oxygen consumption (EPOC), a measure of recovery costs, is known to be large in ectothermic vertebrates such as the desert iguana (Dipsosaurus dorsalis), especially after vigorous activity. To analyze the cause of these large recovery costs in a terrestrial ectotherm, Dipsosaurus were run for 15 s at maximal-intensity (distance 35.0+/-1.9 m; 2.33+/-0.13 m s(-1)) while O(2) uptake was monitored via open-flow respirometry. Muscle metabolites (adenylates, phosphocreatine, and lactate) were measured at rest and after 0, 3, 10, and 60 min of recovery. Cardiac and ventilatory activity during rest and recovery were measured, as were whole-body lactate and blood lactate, which were used to estimate total muscle activity. This vigorous activity was supported primarily by glycolysis (65%) and phosphocreatine hydrolysis (29%), with only a small contribution from aerobic metabolism (2.5%). Aerobic recovery lasted 43.8+/-4.6 min, and EPOC measured 0.166+/-0.025 mL O(2) g(-1). This was a large proportion (98%) of the total suprabasal metabolic cost of the activity to the animal. The various contributions to EPOC after this short but vigorous activity were quantified, and a majority of EPOC was accounted for. The two primary causes of EPOC were phosphocreatine repletion (32%-50%) and lactate glycogenesis (30%-47%). Four other components played smaller roles: ATP repletion (8%-13%), elevated ventilatory activity (2%), elevated cardiac activity (2%), and oxygen store resaturation (1%).
Authors:
Thomas V Hancock; Todd T Gleeson
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2007-11-06
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  81     ISSN:  1522-2152     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2008 Jan-Feb
Date Detail:
Created Date:  2007-11-27     Completed Date:  2008-01-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-13     Citation Subset:  IM    
Affiliation:
Department of Integrative Physiology, University of Colorado, Boulder, Colorado 80309-0354, USA. thancock@ewu.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Energy Metabolism / physiology*
Female
Lizards / physiology*
Male
Oxygen Consumption / physiology*
Physical Exertion / physiology*
Respiration
Running / physiology
Time Factors

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


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