Detection of Nonlinearity in the Healthy Heart Rhythm

S. Chillemi; M. Barbi; A. Di Garbo; R. Balocchi; C. Michelassi; C. Carpeggiani; M. Emdin

doi:10.1055/s-0038-1636860

Methods of Information in Medicine, Table of Contents

Methods Inf Med 1997; 36(04/05): 278-281
DOI: 10.1055/s-0038-1636860

Original Article

Schattauer GmbH

Detection of Nonlinearity in the Healthy Heart Rhythm

S. Chillemi

¹Institute of Biophysics, CNR, Pisa, Italy

,

M. Barbi

¹Institute of Biophysics, CNR, Pisa, Italy

,

A. Di Garbo

¹Institute of Biophysics, CNR, Pisa, Italy

,

R. Balocchi

²Institute of Clinical Physiology, CNR, Pisa, Italy

,

C. Michelassi

²Institute of Clinical Physiology, CNR, Pisa, Italy

,

C. Carpeggiani

²Institute of Clinical Physiology, CNR, Pisa, Italy

,

M. Emdin

²Institute of Clinical Physiology, CNR, Pisa, Italy

› Author Affiliations

Abstract

Abstract:

Sequences of interbeat intervals from two groups of subjects, 24 in relaxed and 10 in sleeping condition were analyzed by the nonlinear predictor method as well as by a method, proposed recently, able to directly estimate the time series nonlinearity. The nonlinear predictability of the R-R intervals is tested by using surrogate data. The results obtained with both methods show that nearly all the sequences exhibit a statistically meaningful degree of nonlinearity. This raises the question whether such nonlinearity encodes information about the physiological condition of the examined subjects.

Keywords:

Heartbeat Time Series - Nonlinear Predictors - Nonlinear Dynamics - Deterministic Chaos

Full Text

References

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