Document Detail

A new ensemble averaging technique in impedance cardiography for estimation of stroke volume during treadmill exercise.
MedLine Citation:
PMID:  1419917     Owner:  NLM     Status:  MEDLINE    
In this study, a new ensemble average technique is developed to measure cardiac output during treadmill exercise. Each dz/dt peak is used as a starting point for ensemble averaging, instead of the conventionally used R point of the ECG, in order to prevent the peak dz/dt waveform (C point) from smoothing, which results in increased dz/dtmax. The R-Z interval from the R point of the ECG to the peak dz/dt varies for each heart beat especially during strenuous exercise. Signal-to-noise ratios of five subjects obtained with the new technique are 0-32.6% higher than those obtained with the conventional technique at rest and during four levels of treadmill exercise. Power spectral densities of the averaged dz/dt waveforms by the peak dz/dt and R point references are also analyzed. Stroke volumes of the five subjects averaged by the peak dz/dt are 0-23.5% higher than those obtained by the R point at rest and during four levels of exercise.
D W Kim; C G Song; M H Lee
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering     Volume:  4     ISSN:  0921-3775     ISO Abbreviation:  Front Med Biol Eng     Publication Date:  1992  
Date Detail:
Created Date:  1992-12-01     Completed Date:  1992-12-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9011464     Medline TA:  Front Med Biol Eng     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  179-88     Citation Subset:  IM    
Department of Medical Engineering, Yonsei University, Seoul, Korea.
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MeSH Terms
Cardiography, Impedance / methods*
Exercise / physiology*
Fourier Analysis
Reference Values
Signal Processing, Computer-Assisted*
Software Design
Stroke Volume*

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

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