Document Detail

Transfer function analysis from arterial baroreceptor afferent activity to renal nerve activity in rabbits.
MedLine Citation:
PMID:  8304519     Owner:  NLM     Status:  MEDLINE    
In vagotomized and anesthetized rabbits, aortic pressure (AP), aortic depressor nerve activity (ANA), and renal sympathetic nerve activity (RNA) were simultaneously measured while perturbing AP randomly. To quantitatively characterize the role of the arterial baroreflex system in generating RNA, we determined the transfer function (TF) of the central baroreflex arc from ANA to RNA in the frequency domain (0.02-5 Hz). The magnitude of squared coherence was > 0.5, the phase was close to -180 degrees, and the gain of TF was flat over 0.02-0.3 Hz, indicating that changes in RNA were linearly and instantaneously but inversely related to changes in ANA over this frequency range. Above 0.3 Hz, the coherence was low, suggesting that RNA unrelated to ANA existed in the frequency range. In animals without AP perturbations, power spectrum of RNA resided over 0.2-5 Hz with a broad peak at 1 Hz, which may represent central activity. Our results suggest that over 0.02-0.3 Hz the relationship between arterial baroreceptor afferent nerve activity and RNA is linear and instantaneous but above 0.3 Hz it is not linear possibly due to an interaction between central activity and arterial baroreflex.
T Imaizumi; Y Harasawa; S Ando; M Sugimachi; A Takeshita
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  266     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1994 Jan 
Date Detail:
Created Date:  1994-03-09     Completed Date:  1994-03-09     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H36-42     Citation Subset:  IM    
Research Institute of Angiocardiology and Cardiovascular Clinic, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
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MeSH Terms
Afferent Pathways / physiology
Aorta / innervation
Arteries / innervation*
Fourier Analysis
Kidney / innervation*
Nervous System Physiological Phenomena*
Pressoreceptors / physiology*

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