Document Detail

Stress cardiovascular/autonomic interactions in mice.
MedLine Citation:
PMID:  16962148     Owner:  NLM     Status:  MEDLINE    
Studies evaluated the role of the autonomic nervous system in the cardiovascular response to stress using radiotelemetric blood pressure (BP) recording coupled with autoregressive spectral analysis. Conscious male C57/BL6 mice with carotid arterial telemetric catheters were exposed to acute episodes of shaker stress before and after administration of cholinergic, beta1-adrenergic and alpha1-adrenergic receptor antagonists. Pulse interval (PI) and systolic arterial pressure (SAP) were analyzed for variance and the low frequency (LF: 0.1-1.0 Hz) and high frequency (HF: 1-5 Hz) spectral components. Stress (5 min) increased BP and heart rate (HR) as well as PI and SAP variability. PI variance increased from 41+/-6 to 75+/-14 ms2 while SAP variance increased from 25+/-5 to 55+/-9 mm Hg2. Autonomic blockade had specific effects on stress-induced changes in PI and SAP and their respective variability. Atropine reduced the tachycardia and abolished the increase in PI variance and its LF component. Data documents that in mice the cholinergic system is fundamental for the maintenance of HR variability. Atropine had no effects on the BP responses, either the increase in SAP or the variance associated with stress. Atenolol blocked the increase in PI and SAP variability induced by stress. Prazosin reduced the tachycardia produced by stress and blocked the increase in PI (only LF) and SAP variability. Using quantitative spectral analysis of telemetrically collected BP data in mice along with pharmacological antagonism, we were able to accurately determine the role of autonomic input in the mediation of the stress response. Data verify the role of sympathetic/parasympathetic balance in stress-induced changes in HR, BP and indices of variance.
Vera M A Farah; Luis F Joaquim; Mariana Morris
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2006-09-07
Journal Detail:
Title:  Physiology & behavior     Volume:  89     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-10-30     Completed Date:  2007-01-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  569-75     Citation Subset:  IM    
Boonshoft School of Medicine, Wright State University, Department of Pharmacology and Toxicology, Dayton, OH 45401, United States.
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MeSH Terms
Adrenergic Agents / pharmacology
Analysis of Variance
Autonomic Nervous System / drug effects,  physiopathology*
Blood Pressure / drug effects,  physiology*
Heart Rate / drug effects,  physiology*
Mice, Inbred C57BL
Statistics, Nonparametric
Stress, Physiological / etiology,  physiopathology*
Stress, Psychological / physiopathology*
Vibration / adverse effects
Grant Support
Reg. No./Substance:
0/Adrenergic Agents

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

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