title: Correlation of Lorenz scatterplots with frequency-domain heart rate variability.
abstract: Heart rate (HR) variability is important with respect to disease prognosis and the effects of drugs. Lorenz scatterplots provide a simple way to evaluate HR variability visually. The relation of Lorenz scatterplots to frequency-domain HR variability was examined in 75 Holter recordings and in simulated HR trends. The length of Lorenz scatterplots was double-exponentially correlated with total frequency and very-low frequency powers, with correlation coefficients (r) of 0.88. The width of Lorenz scatterplots was highly correlated with the high frequency power (r=0.98). The sum of the width and length of Lorenz scatterplots was highly correlated with the total frequency power (r=0.92). Identical results were obtained when simulated HR trends were used. In conclusion, Lorenz scatterplots provide a simple way to estimate the frequency-domain HR variability.
authors.affiliation: Department of Internal Medicine, Okayama University Medical School, Okayama, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Ueda
authors.forename: Takaaki
authors.initials: T
authors.lastname: Nakatsu
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yamane
authors.forename: Sekiko
authors.initials: S
authors.lastname: Kurazono
authors.forename: Takashi
authors.initials: T
authors.lastname: Murakami
authors.forename: Keiichi
authors.initials: K
authors.lastname: Mashima
authors.forename: Y
authors.initials: Y
authors.lastname: Tominaga
authors.forename: Naoki
authors.initials: N
authors.lastname: Mukouhara
authors.forename: Shozo
authors.initials: S
authors.lastname: Kusachi
authors.forename: Takao
authors.initials: T
authors.lastname: Tsuji
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016477:Artifacts; D002303:Cardiac Output, Low / Q000503:physiopathology; D003198:Computer Simulation; D015716:Electrocardiography, Ambulatory; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D008955:Models, Cardiovascular; D017202:Myocardial Ischemia / Q000503:physiopathology; D017711:Nonlinear Dynamics; D012016:Reference Values; D013223:Statistics as Topic / Q000379:methods*