2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/84484It is shown that in the case of human heart rate, the scaling behaviour of the correlation sum (calculated by the Grassberger-Procaccia algorithm) is a result of the interplay of various factors: finite resolution of the apparatus (finite-size effects), a wide dynamic range of mean heart rate, the amplitude of short-time variability being a decreasing function of the mean heart rate. The value of the scaling exponent depends on all these factors and is a certain measure of short-time variability of the signal.5 pages, 4 figuresMedical PhysicsData Analysis, Statistics and ProbabilityQuantitative Biologytext