Observations and modeling of deterministic properties of human heart rate variability

Pramana

R Baranowski¹  J J Zebrowski1² 

[1] National Institute of Cardiology at Anin, ul. Alpejska 42, Warszawa, Poland$$;Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, Warszawa, Poland$$

关键词: Heart rate variability;    intermittency;    non-stationary dynamical systems.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Simple models show that in Type-I intermittency a characteristic U-shaped probability distribution is obtained for the laminar phase length. The laminar phase length distribution characteristic for Type-I intermittency may be obtained in human heart rate variability data for some cases of pathology. The heart and its regulatory systems are presumed to be both noisy and non-stationary. Although the effect of additive noise on the laminar phase distribution in Type-I intermittency is well-known, the effect of neither multiplicative noise nor non-stationarity have been studied. We first discuss the properties of two classes of models of Type-I intermittency: (a) the control parameter of the logistic map is changed dichotomously from a value within the intermittency range to just below the bifurcation point and back; (b) the control parameter is changed randomly within the same parameter range as in the model class (a). We show that the properties of both models are different from those obtained for Type-I intermittency in the presence of additive noise. The two models help to explain some of the features seen in the intermittency in human heart rate variability.

【 授权许可】

Unknown