Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2002-09-02
Physics
Condensed Matter
Soft Condensed Matter
Conference ISMDA Rome, 10 and 11 OCTOBER 2002. will appear on Lecture Notes on Computer Science
Scientific paper
We analize heartbeat time-series corresponding to several groups of individuals (healthy, heart transplanted, with congestive heart failure (CHF), after myocardial infarction (MI), hypertensive), looking for short- and long-time statistical behaviors. In particular we study the persistency patterns of interbeat times and interbeat-time variations. Long-range correlations are revealed using an information-based technique which makes a wise use of the available statistics. The presence of strong long-range time correlations seems to be a general feature for all subjects, with the exception of some CHF individuals. We also show that short time-properties detected in healthy subjects, and seen also in hypertensive and MI patients, and completely absent in the trasplanted, are characterized by a general behavior when we apply a proper coarse-graining procedure for time series analysis.
Allegrini Paolo
Balocchi Rita
Chillemi Santi
Grigolini Paolo
Palatella Luigi
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