Heart rate variability--a shape analysis of Lorenz plots.
A new quantitative geometrical method to analyse heart rate variability is presented. The standard image analysis techniques were applied to the grey scale images of Lorenz plots, and the outlines of the attractor areas were determined via a contour following procedure based on a maze walking algorithm. For graphs of simple compact shape, the attractor region contours were described in terms of Fourier coefficients.
Sevsek
France
F
University College of Health Studies, University of Ljubljana, Poljanska 26A, 1000, Slovenia.
Jakovljević
Miroljub
M
D000465:Algorithms; D005583:Fourier Analysis; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008433:Mathematics; D013997:Time Factors