Chaos and Heart Rate Variability

Any claim for "chaos" based solely on calculation of dimension or Liapunov number . . . must be viewed with extreme skepticism . . . Glass and Mackey' (1988) Chaos may provide a healthy flexibility to the heart, brain, and other parts of the body. Poop (1989) . . . many of the earlier demonstrations of chaos in biological data are spurious. Rapp3 (1993) Low dimensional chaos prevails in the intact heart. Elbert et al.^ (1994)

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