| Roles of lactate and catecholamines in the energetics of brief locomotion in an ectothermic vertebrate. | |
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MedLine Citation:
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PMID: 11352107 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We have investigated the magnitude and duration of excess post-exercise oxygen consumption (EPOC) in a lizard following a single bout of vigorous exercise of 5-60 s, common activity durations for many ectothermic vertebrates. Desert iguanas (Dipsosaurus dorsalis) were run for 5 s, 15 s, 30 s, or 60 s. Oxygen consumption (VO2) increased from 0.16 ml O2 g(-1) h(-1) at rest to 1.3-1.6 ml O2 g(-1) h(-1) during 5-60 s of running. EPOC duration increased with activity duration, ranging from 35-63 min. EPOC volume, the excess oxygen consumed post-exercise, doubled from 0.13 ml O2 g(-1) following 5 s of activity to 0.25 ml O2 g(-1) after 60 s. EPOC represented 91-98% of the total metabolic expense of the activity. EPOC durations were always shorter than the period required for lactate removal, illustrating that these two processes are not causally related. Alpha- and beta-adrenergic receptor blockade by phentolamine and propranolol had no effect on resting VO2 but depressed excess post-exercise oxygen consumption volumes 2540%. The extent of catechol stimulation post-exercise may be motivation or stimulus dependent. The data indicate that metabolic elevations post-exercise represent the majority of activity costs in lizards. The study suggests that EPOC of ectothermic vertebrates is sensitive to exercise duration and catecholamine release post-activity, even when activity periods are less than 60 s in duration. |
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Authors:
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J M Nedrow; D A Scholnick; T T Gleeson |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology Volume: 171 ISSN: 0174-1578 ISO Abbreviation: J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol. Publication Date: 2001 Apr |
Date Detail:
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Created Date: 2001-05-15 Completed Date: 2001-09-20 Revised Date: 2009-06-08 |
Medline Journal Info:
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Nlm Unique ID: 8413200 Medline TA: J Comp Physiol B Country: Germany |
Other Details:
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Languages: eng Pagination: 237-45 Citation Subset: IM |
Affiliation:
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Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder 80309-0334, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adrenergic Antagonists
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pharmacology Animals Catecholamines / physiology* Energy Metabolism / physiology* Iguanas / physiology* Lactic Acid / blood, metabolism* Motor Activity / physiology* Osmolar Concentration Oxygen Consumption / drug effects |
| Chemical | |
Reg. No./Substance:
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0/Adrenergic Antagonists; 0/Catecholamines; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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