%0 Journal Article
%T Critical Scale-invariance in Healthy Human Heart Rate
%A Ken Kiyono
%A Zbigniew R. Struzik
%A Naoko Aoyagi
%A Seiichiro Sakata
%A Junichiro Hayano
%A Yoshiharu Yamamoto
%J Quantitative Biology
%D 2004
%I arXiv
%R 10.1103/PhysRevLett.93.178103
%X 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.
%U http://arxiv.org/abs/q-bio/0409039v1