Critical Scale-invariance in Healthy Human Heart Rate
arXiv:q-bio/0409039 · doi:10.1103/PhysRevLett.93.178103
Abstract
We demonstrate the robust scale-invariance in the probability density function (PDF) of detrended healthy human heart rate increments, which is preserved not only in a quiescent condition, but also in a dynamic state where the mean level of heart rate is dramatically changing. This scale-independent and fractal structure is markedly different from the scale-dependent PDF evolution observed in a turbulent-like, cascade heart rate model. These results strongly support the view that healthy human heart rate is controlled to converge continually to a critical state.
9 pages, 3 figures. Phys. Rev. Lett., to appear (2004)
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