Reference : Of larks and hearts – morningness/eveningness, heart rate variability and cardiovascu...

	Document type :	Scientific journals : Article
	Discipline(s) :	Social & behavioral sciences, psychology : Animal psychology, ethology & psychobiology Social & behavioral sciences, psychology : Neurosciences & behavior Social & behavioral sciences, psychology : Theoretical & cognitive psychology Social & behavioral sciences, psychology : Treatment & clinical psychology Human health sciences : Psychiatry
	To cite this reference:	http://hdl.handle.net/10993/3436

Title :	Of larks and hearts – morningness/eveningness, heart rate variability and cardiovascular stress response at different times of the day
Language :	English
Author, co-author :	Roeser, Karolin [University of Würzburg, Germany]
	Obergfell, Friederike [University of Würzburg, Germany]
	Meule, Adrian [University of Würzburg, Germany]
	Vögele, Claus [University of Luxembourg > Faculty of Language and Literature, Humanities, Arts and Education (FLSHASE) > Integrative Research Unit: Social and Individual Development (INSIDE) >]
	Schlarb, Angelika [University of Tübingen, Germany]
	Kübler, Andrea [University of Würzburg, Germany]
Publication date :	2012
Journal title :	Physiology and Behavior
Publisher :	Elsevier Science
Volume :	106 (2)
Pages :	151-157
Peer reviewed :	Yes (verified by ORBilu)
Audience :	International
ISSN :	0031-9384
City :	New York
Country :	NY
Keywords :	[en] Morningness/Eveningness ; Heart Rate Variability ; Chronotype ; Time of Day ; Psychological Stress ; Cardiovascular Reactivity
Abstract :	[en] Inter-individual differences in the circadian period of physical and mental functions can be described on the dimension of morningness/eveningness. Previous findings support the assumption that eveningness is related to greater impulsivity and susceptibility to stress than morningness. Heart rate variability (HRV) serves as a physiological correlate of self- and emotional regulation and has not yet been investigated in relation to chronotypes. The study explores differences in HRV and other cardiovascular measures in morning- and evening-types at rest and under stress at different times of day (8-11 a.m. or 4-7 p.m.). Students (N = 471) were screened for chronotype and n = 55 females (27 morning- and 28 evening-types) were recruited for testing. These participants performed a mental arithmetic task while heart rate (HR) and blood pressure (BP) were recorded. Spectral components and a time-domain measure of HRV were calculated on HR data from resting and mental stress periods. Evening-types had significantly higher HR and systolic BP, but lower HRV than morning-types both at baseline and during stress. Stress induced in the evening had a significantly stronger impact on absolute and baseline corrected physiological measures in both chronotypes. The interaction of chronotype and testing time did not reach the level of significance for any of the dependent variables. The enhanced physiological arousal in evening-types might contribute to increased vulnerability to psychological distress. Hence, previous behavioral findings are supported by the physiological data of this study.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/10993/3436
DOI :	10.1016/j.physbeh.2012.01.023

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