Document Detail


Influence of cardiac neural inputs on rhythmic variations of heart period in the cat.
MedLine Citation:
PMID:  1115243     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Spectral analysis was used to investigate variations of heart period in 13 decerebrate cats under different conditions of neural input to the heart. Spectral density plots in intact animals showed three well-defined peaks: P1 (1.5-2.5 cycles/min), P2 (6-10 cycles/min), and P2 (respiratory frequency). In the presence of sympathetic input only the amplitudes of all peaks were decreased; when only vagal input was present the amplitudes of P1 and P2 were increased and there was no change in P3; when neither sympathetic nor vagal input was present the amplitudes of all peaks were decreased. In addition, the amplitudes of P1 and P2 were increased and there was no change in P3; when neither sympathetic nor vagal input was present the amplitudes of all peaks were decreased. In addition, the amplitudes of P1 and P2 were found to be significantly correlated with the mean heart period under the condition of vagal control only. It is concluded that P3 is related to sinus arrhythmia and that P1 and P2 may be related to spontaneous rhythms that are an intrinsic feature of the dynamic regulation of heart period by the vagus system. Sympathetic activity plays no role in the genesis of these rhythms.
Authors:
G F Chess; R M Tam; F R Calaresu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  228     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1975 Mar 
Date Detail:
Created Date:  1975-05-19     Completed Date:  1975-05-19     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  775-80     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Arrhythmia, Sinus / etiology
Atropine / pharmacology
Cats
Cerebral Decortication
Heart Rate*
Propranolol / pharmacology
Respiration*
Spectrum Analysis
Sympathetic Nervous System / physiology*
Vagotomy
Vagus Nerve / physiology*
Chemical
Reg. No./Substance:
51-55-8/Atropine; 525-66-6/Propranolol

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


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