PUMA
Istituto di Biofisica     
Barbi M., Santi C., Di Garbo A., Balocchi R., Carpeggiani C., Emdin M., Michelassi C. Nonlinearity of normal sinus rhythm. In: Chaos and noise in biology and medicine (Casamicciola, Napoli, 19-24 may 1997). Proceedings, pp. 86 - 96. M. Barbi, S. Chillemi (eds.). (Series of Biophysics and Biocybernetics, vol. 7). World Scientific, 1998.
 
 
Abstract
(English)
Trying to answer the question whether the irregular heart activity is due to a chaotic process, short term predictability and nonlinearity were estimated on sequences of interbeat intervals from 24 subject in relaxed conditions. The classical non-linear prediction method as well as a direct one, able to estimate the time series nonlinearity (Sugihara, 1994) were employed. The two approaches yield very similar results showing that a clear nonlinear behaviour is present in most of the examinated sequecences. Furthmore, the statistic produced by a completely different method as dentrended fluctuation analysis (Peng et al., 1995) exhibits a strong correlation with the estimators of nonlinearity.
Subject Chaos
Sinus rhythm


Icona documento 1) Download Document PDF


Icona documento Open access Icona documento Restricted Icona documento Private

 


Per ulteriori informazioni, contattare: Librarian http://puma.isti.cnr.it

Valid HTML 4.0 Transitional