4 papers
Behavioral-Independent Features of Complex Heartbeat Dynamics
Luis A. Nunes Amaral, Plamen Ch. Ivanov, Naoko Aoyagi +5
We test whether the complexity of cardiac interbeat interval time series is simply a consequence of the wide range of scales characterizing human behavior, especially physical acti…
Noise Effects on the Complex Patterns of Abnormal Heartbeats
Verena Schulte-Frohlinde, Yosef Ashkenazy, Plamen Ch. Ivanov +3
Patients at high risk for sudden death often exhibit complex heart rhythms in which abnormal heartbeats are interspersed with normal heartbeats. We analyze such a complex rhythm in…
Sleep-Wake Differences in Scaling Behavior of the Human Heartbeat: Analysis of Terrestrial and Long-Term Space Flight Data
Plamen Ch. Ivanov, Armin Bunde, Luís A. N. Amaral +5
We compare scaling properties of the cardiac dynamics during sleep and wake periods for healthy individuals, cosmonauts during orbital flight, and subjects with severe heart diseas…
Stochastic Feedback and the Regulation of Biological Rhythms
Plamen Ch. Ivanov, Luis A. N. Amaral, Ary Goldberger +1
We propose a general approach to the question of how biological rhythms spontaneously self-regulate, based on the concept of ``stochastic feedback''. We illustrate this approach by…