Istituto di Biofisica     
Barbi M., Chillemi S., Di Garbo A., Balocchi R., Carpeggiani C., Emdin M., Michelassi C., Santarcangelo E. Predictability and nonlinearity of the heart rhythm. In: Chaos Solitons & Fractals, vol. 9 (3) pp. 507 - 515. Elsevier, 1998.
Sequences of interbeat intervals from 24 subjects in relaxed conditions are analysed by the classical nonlinear prediction method as well as by a direct one, able to estimate the time series nonlinearity. The two approaches yield very similar results, showing that a clear nonlinear behaviour is present in most of the examined sequences. Furthermore, a completely different method, detrended fluctuation analysis, is applied to the data. Unexpectedly, the corresponding statistics strongly correlates with the estimators of nonlinearity.
DOI: 10.1016/S0960-0779(97)00082-9
Subject Heart
Time series

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