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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
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