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The analysis of Blood Pressure (BP) and Heart Rate (HR) variability in the frequency domain is currently used to investigate the mechanisms responsible for cardiovascular control. The potentialities of this methodology are greatly enhanced by techniques able to track the changes of BP and HR spectral characteristics for prolonged time periods. Up to now, specific techniques for dynamic spectral analysis are complex and provide results not always easy to interpret by visual inspection. Simplified tracking procedures may be obtained by the application of standard spectral estimators in a sequential fashion. Aim of this paper is to address the methodological and practical aspects of sequential spectral analysis in the study of long term BP and HR recordings. A short review of the results we obtained by this technique in the analysis of data from humans and animals is provided as well.
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