Nonlinear Phenomena in Complex Systems, 2001, Vol.4, No.3, pp.285-294

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2001, Volume 4, Number 3, pp.285-294

Paired Lyapunov Exponents Characterise Blood Flow Dynamics in Healthy Subjects
M. Bracic and A. Stefanovska

In order to gain an insight into the dynamics of the cardiovascular system, throughout which blood circulates, the time series measured from blood flow are analysed by calculating the local and global Lyapunov exponents. Over a wide range of algorithm parameters, five paired exponents are typically obtained. This may be evidence of the deterministic and almost conservative nature of the system governing cardiovascular dynamics on the time scale of minutes. The values of the exponents change in respect to the state of the system.
Key words: Lyapunov exponents, blood flow, deterministic dynamical systems

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