title: Asymmetric properties of long-term and total heart rate variability.
abstract: We report on two new physiological phenomena: the long-term and total heart rate asymmetry, which describe a significantly larger contribution of heart rate accelerations to long-term and total heart rate variability. In addition to the existing pair of indices, SD1(d); SD1(a); which are based on partitioning short-term variance, we introduce two other pairs of descriptors based on partitioning longterm (SD2(d); SD2(a)) and total (SDNN(d); SDNN(a)) heart rate variability. The new asymmetric descriptors are used to analyze RR intervals time series derived from the 30-min ECG recordings of 241 healthy subjects resting in supine position. It is shown that both new types of asymmetry are present in 76% of the subjects. The new phenomena reported here are real physiological findings rather than artifacts of the method since they vanish after data shuffling.
authors.affiliation: Institute of Physics, University of Zielona Gora, Szafrana 4a, Zielona Gora, Poland. jaropis@zg.home.pl
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Piskorski
authors.forename: Przemyslaw
authors.initials: P
authors.lastname: Guzik
mesh_terms: D000328:Adult; D004562:Electrocardiography / Q000379:methods; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D012815:Signal Processing, Computer-Assisted; D016683:Supine Position / Q000502:physiology; D055815:Young Adult