title: [Features of the variability of the cardiac circadian rhythm under conditions of free activity].
authors.forename: L M
authors.initials: LM
authors.lastname: Makarov
mesh_terms: D000293:Adolescent; D002940:Circadian Rhythm / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans
vernacular_title: Osobennosti variabel'nosti tsirkadnogo ritma serdtsa u usloviiakh svobodnoĭ aktivnosti.