The probability density function of detrended healthy human heart rate increments exhibits robust scale-invariance across scales from 8 to 4,096 beats, suggesting convergence to a critical state.
Observational (n=57)
Healthy human heart rate dynamics exhibit robust scale invariance, suggesting the heart is controlled to converge continually to a critical state rather than following a turbulent-like cascade model.
p-value: p=>0.05
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 et al. (Wed,) conducted a observational in Healthy (n=57). Healthy human heart rate dynamics vs. Surrogate data and cascade model was evaluated on Scale dependence of the fitting parameter λ² of Castaing's equation (p=>0.05). The probability density function of detrended healthy human heart rate increments exhibits robust scale-invariance across scales from 8 to 4,096 beats, suggesting convergence to a critical state.