Säkki, M; Kalda, J; Vainu, M; Laan, M - In: Physica A: Statistical Mechanics and its Applications 338 (2004) 1, pp. 255-260
We study the long-term dynamics of the short-time variability level of human heart rate, an aspect which is not addressed by the traditional methods of non-linear time-series analysis. The length-distribution of low-variability periods in human heartbeat dynamics typically follows a...