title: Models of reactions of human heart as nonlinear dynamic system to cosmic and geophysical factors.
abstract: The paper analyzes theoretical models of the adaptive modes of generation and stability of human heart as a nonlinear point source. The analysis encompasses only ECG time-domain dynamics. To solve the general problem of the study of the adaptive changes of the cardiosignal under the action of external periodic force and parametric noise, a new dynamic model is proposed, which incorporates two control physical parameters: power of signal generation and coefficient of diffuse signal scattering. For the entire set of parameters, the examined modeled nonlinear system demonstrated a number of various performance modes ranging from steady-state periodic and quasi-periodic states to chaos. The model showed that variations in cosmic, geophysical, and weather conditions in the frequency range of 0.1-0.9 Hz produce the greatest biotropic influence.
authors.affiliation: Research Institute of Geophysics, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Pipin
authors.forename: M V
authors.initials: MV
authors.lastname: Ragulskaya
authors.forename: S M
authors.initials: SM
authors.lastname: Chibisov
mesh_terms: D003198:Computer Simulation; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006801:Humans; D008955:Models, Cardiovascular; D017711:Nonlinear Dynamics; D010507:Periodicity