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.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Song CG,Kim DWdoi
10.1016/s1350-4533(03)00024-9subject
Has Abstractpub_date
2003-07-01 00:00:00pages
517-22issue
6eissn
1350-4533issn
1873-4030pii
S1350453303000249journal_volume
25pub_type
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