Document Detail


Assessment of frequency shifts in R-R interval variability and respiration with complex demodulation.
MedLine Citation:
PMID:  7896636     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A complex demodulation (CDM) method for continuous assessment of frequency shifts and time-dependent changes in amplitude in the rhythmic components existing in predefined frequency bands was proposed and applied to the analysis of high-frequency (HF) and low-frequency (LF) components of the R-R interval and to the analysis of respiration via impedance spirogram. Simulation studies revealed that this CDM technique furnishes mathematical features well suited to the investigation of non-stationary R-R interval signals and can delineate time-dependent fluctuations in both amplitude and frequency, accurately differentiating between HF and LF components. Analysis of data during paced breathing at different respiratory frequencies revealed that the estimated frequency of the HF component and respiration faithfully reflected the frequency of paced breathing. Analysis of data during dynamic exercise with increasing workload (20 W/min) showed that the frequency of the HF component was elevated with exercise and that both HF and LF amplitudes were reduced progressively with advancing load. CDM-derived frequency and amplitude of respiration were highly correlated to direct breath-by-breath respiratory frequency and tidal volume measurements. We conclude that this method could provide a powerful means for continuously assessing time-dependent changes in both cardiovascular and respiratory variations.
Authors:
J Hayano; J A Taylor; S Mukai; A Okada; Y Watanabe; K Takata; T Fujinami
Related Documents :
9313996 - An investigation of stretch reflex in physiological tremor.
19909966 - Acoustic analysis of the tremulous voice: assessing the utility of the correlation dime...
23761846 - Impact on stereo-acuity of two presbyopia correction approaches: monovision and small a...
24296806 - Comparison of gait between healthy participants and persons with spinal cord injury whe...
24433326 - A clinical trial of active hearing protection for orchestral musicians.
24647596 - Pelvic incidence-lumbar lordosis mismatch results in increased segmental joint loads in...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  77     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1994 Dec 
Date Detail:
Created Date:  1995-04-21     Completed Date:  1995-04-21     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2879-88     Citation Subset:  IM; S    
Affiliation:
Third Department of Internal Medicine, Nagoya City University Medical School, Japan.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Computer Simulation
Heart Rate*
Humans
Male
Models, Biological*
Physical Exertion
Respiration*

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


Previous Document:  Oxygen transport to tissue by persistent bubbles: theory and simulations.
Next Document:  One-dimensional simulation of aerosol transport and deposition in the human lung.