Document Detail

Interaction between respiratory and RR interval oscillations at low frequencies.
MedLine Citation:
PMID:  2341698     Owner:  NLM     Status:  MEDLINE    
Oscillations in RR interval between 0.02 and 1.00 cycles per second (Hz) have been related to the action of the autonomic nervous system. Respiration has been shown to influence RR interval at normal breathing frequencies between approximately 0.16 and 0.5 Hz in children and adults--a phenomenon known as respiratory sinus arrhythmia. In this study we investigated the effect of respiration on RR interval in a lower frequency range between 0.02 and 0.12 Hz. Low frequency oscillations in respiration were induced in healthy sleeping adult subjects via the administration of a bolus of CO2 during inhalation. Power spectra of RR interval and respiration were obtained before and after the CO2 pulse, and the frequency content in the low frequency range was quantitatively compared. An increase in the spectral energy in both respiration and RR interval was observed for the group. However, this increase was accounted for by six of 29 epochs. We conclude that respiration (tidal volume) can influence RR interval at frequencies below those usually associated with respiratory sinus arrhythmia. This influence may be mediated through a sympathetic reflex. This result is applicable to the measurement and interpretation of heart rate variability and to autonomic influences of low frequency fluctuations in RR interval.
A Aguirre; G R Wodicka; C Maayan; D C Shannon
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the autonomic nervous system     Volume:  29     ISSN:  0165-1838     ISO Abbreviation:  J. Auton. Nerv. Syst.     Publication Date:  1990 Mar 
Date Detail:
Created Date:  1990-06-26     Completed Date:  1990-06-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8003419     Medline TA:  J Auton Nerv Syst     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  241-6     Citation Subset:  IM    
Biomedical Engineering Department, Massachusetts General Hospital, Boston 02114.
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MeSH Terms
Heart / physiology
Heart Rate*
Respiration / physiology*

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

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