Document Detail

Use of amplitude-modulated breathing for assessment of cardiorespiratory frequency response within subrespiratory frequencies.
MedLine Citation:
PMID:  9473850     Owner:  NLM     Status:  MEDLINE    
We present a new technique which uses amplitude-modulated breathing patterns to obtain estimates of frequency response between respiration and heart rate within subrespiratory frequencies. Frequency response between respiration and heart rate has been previously estimated using broadband respiration and metronomic breathing. However, the estimates obtained using these techniques show low coherence between respiration and heart rate within the subrespiratory frequencies (< 0.12-0.15 Hz). The advantages of amplitude-modulated breathing are: enhancement in the degree of perturbation within subrespiratory frequencies as indicated by relatively higher coherencies between respiration and heart rate (approximately equal to 0.7), and the subjects do not have to breathe at very low breathing frequencies or resort to breath holds. Use of a squared sine wave carrier modulated by sinusoidal functions enabled us to obtain energy distributions at subrespiratory frequencies without using demodulation. Results obtained at eight subrespiratory frequencies from ten subjects show that the new technique is easy to implement and produces relatively higher coherence between respiration and heart rate. The advantage of the new technique in terms of enhancing the level of perturbations within subrespiratory frequencies is particularly important, because it is in this frequency range that the interpretation of variability in heart rate in terms of autonomic origins is incompletely understood and is confounded by respiratory interactions.
A Patwardhan; S Vallurupalli; J Evans; C Knapp; E Bruce
Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  45     ISSN:  0018-9294     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  1998 Feb 
Date Detail:
Created Date:  1998-03-10     Completed Date:  1998-03-10     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  268-73     Citation Subset:  IM    
Center for Biomedical Engineering, University of Kentucky, Lexington 40506-0070, USA.
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MeSH Terms
Computer Simulation
Heart Rate / physiology*
Lung Volume Measurements
Models, Biological
Monitoring, Physiologic / methods*
Reference Values
Respiration / physiology*

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

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