Beyond 1/f: Multifractality in human heartbeat dynamics

Ivanov, Plamen Ch.; Amaral, Luı´s A. Nunes; Goldberger, Ary L.; Havlin, Shlomo; Rosenblum, Michael G.; Struzik, Zbigniew; Stanley, H. Eugene
March 2000
AIP Conference Proceedings;2000, Vol. 511 Issue 1, p273
Academic Journal
Recent evidence suggests that physiological signals under healthy conditions may have a fractal temporal structure. We investigate the possibility that time series generated by certain physiological control systems may be members of a special class of complex processes, termed multifractal, which require a large number of exponents to characterize their scaling properties. We report on evidence for multifractality in a biological dynamical system—the healthy human heartbeat. Further, we show that the multifractal character and nonlinear properties of the healthy heart rate are encoded in the Fourier phases. We uncover a loss of multifractality for a life-threatening condition, congestive heart failure. © 2000 American Institute of Physics.


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