title: [The role of timing factors for the effect of caffeine on heart rhythm variability in healthy humans].
abstract: Caffeine upon single administration optimizes the indices of heart rhythm variability in young humans and enhances parasympathotonia. The expression of this reaction depends on the daytime (being more pronounced in the morning than in the evening) and on the chronotype (morningness) of volunteers.
authors.forename: O A
authors.initials: OA
authors.lastname: Baĭda Mastiagina
authors.forename: S S
authors.initials: SS
authors.lastname: Mastiagin
authors.forename: E B
authors.initials: EB
authors.lastname: Arushanian
mesh_terms: D000293:Adolescent; D000328:Adult; D002110:Caffeine / Q000494:pharmacology*; D002940:Circadian Rhythm / Q000502:physiology*; D004562:Electrocardiography / Q000187:drug effects / Q000523:psychology; D005260:Female; D006339:Heart Rate / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D008297:Male; D013997:Time Factors
chemical_list: D002110:Caffeine