Key result
Morning chronotype in young healthy individuals is associated with morning sympathicotonia that decreases by evening, whereas the evening chronotype shows the reverse pattern.
Observational
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Cardiac autonomic tone varies throughout the day depending on an individual's chronotype.
Differences in cardiointervalogram parameters have been revealed in young people with the morning and evening chronotypes. Individuals with the morning chronotype are characterized by a tendency to sympathicotonia in the morning, which decreases towards the end of the day. For individuals with the evening chronotype, a reverse tendency is typical, which is manifested as the appearance of signs of cardiointervalogram sympathization in the evening.
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Arushanyan et al. (2006) conducted an observational in Healthy individuals. Morning chronotype vs. Evening chronotype was evaluated on Cardiointervalogram parameters (variability of cardiac rhythm). Morning chronotype in young healthy individuals is associated with morning sympathicotonia that decreases by evening, whereas the evening chronotype shows the reverse pattern.
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