Are R-R-Intervals Data Appropriate to Study the Dynamics of Heart?
We consider the problem of recovering the implied dynamical system, which describes the dynamics of heart, from a time series of RR intervals. The main conclusion is that on small time scales such recovery fails, and on large time scales the correlation integral behaves like that for noisy system. Consequently, it seems that recovery of underlying dynamical system and measuring its parameters (dimension, Lyapunov exponents etc.) from these data is hardly possible and more adequate is application of statistical techniques.
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