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An improved approach for measurement of stroke volume during treadmill exercise

Authors
 C G Song  ;  D W Kim 
Citation
 MEDICAL ENGINEERING & PHYSICS, Vol.25(6) : 517-522, 2003-07 
Journal Title
 MEDICAL ENGINEERING & PHYSICS 
ISSN
 1350-4533 
Issue Date
2003-07
MeSH
Algorithms* ; Artifacts* ; Cardiography, Impedance / instrumentation ; Cardiography, Impedance / methods* ; Diagnosis, Computer-Assisted / instrumentation ; Diagnosis, Computer-Assisted / methods* ; Exercise Test / instrumentation ; Exercise Test / methods* ; Heart Rate / physiology* ; Humans ; Male ; Reproducibility of Results ; Sensitivity and Specificity ; Stroke Volume / physiology*
Abstract
In this study, a new ensemble averaging technique was 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 ECG, in order to prevent the peak dz/dt waveform (C point) to be smoothed, which results in increased dz/dtmax. When using the R point as a reference, time interval from the R point to the peak dz/dt varies for each heart beat. Signal to noise ratios (SNR) of the five subjects with the new technique were 12.9, 16. 4, 10.6, 14.0, and 4.6% higher than those with the conventional one at rest and during four levels of exercise, respectively. Power density spectra of the averaged dz/dt waveforms by the peak dz/dt and R point referencing were also analyzed. Stroke volumes of the five subjects averaged by the peak dz/dt were 4.9, 6.8, 7.6, 7.4, and 9.8% higher than those by the R point at rest and during four levels of exercise, respectively.
Full Text
https://www.sciencedirect.com/science/article/pii/S1350453303000249
DOI
10.1016/s1350-4533(03)00024-9
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Medical Engineering (의학공학교실) > 1. Journal Papers
Yonsei Authors
Kim, Deok Won(김덕원)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/178766
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