title: The analysis of variability.
authors.affiliation: Department of Physiology, McGill University, Montreal, Canada.
authors.forename: D T
authors.initials: DT
authors.lastname: Kaplan
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D002320:Cardiovascular Physiological Phenomena; D005583:Fourier Analysis; D006339:Heart Rate / Q000502:physiology; D006801:Humans