Critical scale invariance in a healthy human heart rate.
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 the heart rate is dramatically changing. This scale-independent and fractal structure is markedly different from the scale-dependent PDF evolution observed in a turbulentlike, cascade heart rate model. These results strongly support the view that a healthy human heart rate is controlled to converge continually to a critical state.
Kiyono
Ken
K
Educational Physiology Laboratory, Graduate School of Education, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Struzik
Zbigniew R
ZR
Aoyagi
Naoko
N
Sakata
Seiichiro
S
Hayano
Junichiro
J
Yamamoto
Yoshiharu
Y
D003198:Computer Simulation; D003627:Data Interpretation, Statistical; D006321:Heart / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008955:Models, Cardiovascular