Document Detail


Renal hemodynamic responses to dynamic exercise in rabbits.
MedLine Citation:
PMID:  9804559     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Cardiovascular hemodynamics, including renal blood flow, were measured in rabbits with one intact and one denervated kidney during various intensities of treadmill exercise. Within the first 10 s of exercise, there was rapid vasoconstriction in the innervated kidney associated with decreases in renal blood flow (range -10 to -17%). The vasoconstriction in the innervated kidney was evident at all workloads and was intensity dependent. There was no significant vasoconstriction or change in renal blood flow (range 0.5 to -3.1%) in the denervated kidney at the onset of exercise. However, a slowly developing vasoconstriction occurred in the denervated kidney as exercise progressed to 2 min at all workloads. Examination of responses to exercise performed under alpha-adrenergic blockade with phentolamine (5 mg/kg iv) revealed that the vasoconstriction in the innervated kidney at the onset of exercise and the delayed vasoconstriction in the denervated kidney were due primarily to activation of alpha-adrenergic receptors. In addition, a residual vasoconstriction was also present in the innervated kidney after alpha-adrenergic blockade, suggesting that, during exercise, activation of other renal vasoconstrictor mechanisms occurs which is dependent on the presence of renal nerves.
Authors:
P J Mueller; K P O'Hagan; K A Skogg; J B Buckwalter; P S Clifford
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  85     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1998 Nov 
Date Detail:
Created Date:  1998-12-29     Completed Date:  1998-12-29     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1605-14     Citation Subset:  IM    
Affiliation:
Departments of Anesthesiology and Physiology, Medical College of Wisconsin and Veterans Affairs Medical Center, Milwaukee, Wisconsin 53295, USA.
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MeSH Terms
Descriptor/Qualifier:
Adrenergic alpha-Agonists / pharmacology
Adrenergic alpha-Antagonists / pharmacology
Animals
Blood Pressure / physiology
Denervation
Female
Formaldehyde / pharmacology
Heart Rate / drug effects,  physiology
Kidney / innervation
Norepinephrine / metabolism
Phenylephrine / pharmacology
Physical Exertion / physiology*
Rabbits
Receptors, Adrenergic, alpha / drug effects,  physiology
Reflex / physiology
Renal Circulation / drug effects,  physiology*
Vasoconstriction / drug effects,  physiology
Chemical
Reg. No./Substance:
0/Adrenergic alpha-Agonists; 0/Adrenergic alpha-Antagonists; 0/Receptors, Adrenergic, alpha; 50-00-0/Formaldehyde; 51-41-2/Norepinephrine; 59-42-7/Phenylephrine

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


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