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- W2592769884 abstract "The amplitudes of R and T waves of the electrocardiogram (ECG) 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." @default.
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- W2592769884 date "2017-03-09" @default.
- W2592769884 modified "2023-09-27" @default.
- W2592769884 title "Trend Extraction in Functional Data of Amplitudes of R and T Waves in Exercise Electrocardiogram" @default.
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- W2592769884 doi "https://doi.org/10.1142/s0219477517500146" @default.
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