Heart rate variability in natural time and 1/f “noise”N. V. Sarlis, E. S. Skordas and P. A. Varotsos
Solid State Section and Solid Earth Physics Institute, Physics Department, University of Athens Panepistimiopolis, Zografos 157 84, Athens, Greece, EU
received 5 January 2009; accepted in final form 16 June 2009; published July 2009
published online 17 July 2009
Several studies have shown that heart rate fluctuations exhibit the ubiquitous 1/f behavior which is altered in desease. Furthermore, the analysis of electrocardiograms in natural time reveals that important malfunctions in the complex system of the human heart can be identified. Here, we present a simple evolution model in natural time that exhibits the 1/f a behavior with a close to unity. The results of this model are consistent with a progressive modification of heart rate variability in healthy children and adolescents. The model results in complexity measures that separate healthy dynamics from patients as well as from sudden cardiac death individuals.
87.10.-e - General theory and mathematical aspects.
87.19.Hh - Cardiac dynamics.
89.75.-k - Complex systems.
© EPLA 2009