The amplitudes of R and T waves of the electrocardiogram recorded during the exercise test show both large inter- and intra-individual variability in response to stress. We analyze a dataset of 65 normal subjects undergoing ambulatory test. We model the dataset of R and T series in the framework of functional data, assuming that the individual series are realizations of a non stationary process, centered at the population trend. We test the time variability of this trend computing a simultaneous confidence band and the zero crossing of its derivative. The analysis shows that the amplitudes of the R and T waves have opposite responses to stress, consisting respectively in a bump and a dip at the early recovery stage. Our findings support the existence of a relationship between R and T wave amplitudes and respectively diastolic and systolic ventricular volumes.
Trend extraction in functional data of amplitudes of R and T waves in exercise electrocardiogram / Cammarota, Camillo; Curione, Mario. - In: FLUCTUATION AND NOISE LETTERS. - ISSN 0219-4775. - STAMPA. - 16:02(2017). [10.1142/S0219477517500146]
Trend extraction in functional data of amplitudes of R and T waves in exercise electrocardiogram
CAMMAROTA, Camillo
;CURIONE, Mario
2017
Abstract
The amplitudes of R and T waves of the electrocardiogram recorded during the exercise test show both large inter- and intra-individual variability in response to stress. We analyze a dataset of 65 normal subjects undergoing ambulatory test. We model the dataset of R and T series in the framework of functional data, assuming that the individual series are realizations of a non stationary process, centered at the population trend. We test the time variability of this trend computing a simultaneous confidence band and the zero crossing of its derivative. The analysis shows that the amplitudes of the R and T waves have opposite responses to stress, consisting respectively in a bump and a dip at the early recovery stage. Our findings support the existence of a relationship between R and T wave amplitudes and respectively diastolic and systolic ventricular volumes.File | Dimensione | Formato | |
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Note: https://www.worldscientific.com/doi/pdf/10.1142/S0219477517500146
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