An Evaluation of the Ensemble Averaged Impedance Cardiogram
作者： Robert M. Kelsey , William Guethlein
DOI: 10.1111/J.1469-8986.1990.TB02173.X
关键词: Sampling (statistics) 、 Amplitude 、 Magnitude (mathematics) 、 Psychology 、 Impedance cardiography 、 Multifunction cardiogram 、 Statistics 、 Electrical impedance 、 Interval (mathematics) 、 Ensemble averaging
摘要: The ensemble averaged impedance cardiogram was evaluated during rest and vocal mental arithmetic stress in samples of female (n=17) male (n=40) undergraduates. Measures myocardial performance determined from signals were compared to those by simple beat-to-beat averaging over 60-s 20-s sampling intervals. In addition, the influence cardiac interval variability on dZ/dt amplitude measures assessed. As expected, derived two techniques corresponded closely, with correlations ranging r=0.882 r=1.000 for intervals, r=0.726 Inverse relationships comparable magnitude found between both techniques, suggesting that these did not result simply artifacts introduced technique. results support validity as a method deriving cardiographic performance.
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