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Demonstration of a circadian rhythm in two parameters of heart rate turbulence—turbulence onset (TO) and turbulence slope (TS)—has been difficult.The aim of this study was to devise a new method for detecting circadian rhythm in noisy data and to apply it to selected Holter recordings from two postmyocardial infarction databases: Cardiac Arrhythmia Suppression Trial (CAST, n = 684) and Innovative...
Most cardiovascular activities show a circadian rhythm, as do electrophysiological phenomenon. Under theinfluence of both external stimuli and endogenous homoeostatic mechanisms, cardiac electrophysiologicalproperties change diurnally and enable the cardiovascular system adapt to rest-exercise cycles. According torecent reports, almost all non-invasive electrophysiological phenomena, such as electrocardiographic...
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