title: [Age dynamics and seasonal variations of parameters of cerebral circulation in children and adolescents from European north].
abstract: Age dynamics and seasonal variations in cerebral blood flow was studied by means of transcranial Doppler in 95 the natives of the Arkhangelsk region school students aged 7 to 18 years. The results of longitudinal (from 2005 to 2014) study of students are presented. The linear blood flow velocity (BFV) showed gradual declining from junior to senior school age, and BFV were in the middle cerebral artery below average, and in the basilar artery--above mid latitude standards. The influence of the seasonal factor is more pronounced in the younger (for boys) and intermediate (for girls) age group and leveled in the older group. The largest seasonal changes were obtained in BFV in carotid arteries, the relative constancy--in BFV in the basilar artery. Estimated by the resistivity index RI circulatory resistance in the younger and intermediate school students groups decreased in the carotid arteries in the spring and summer, and in the posterior cerebral artery territory--in the winter. BFV rate variability identifies groups of children with varying degrees of "sensitivity" to the influence of seasonal factors.
authors.forename: S I
authors.initials: SI
authors.lastname: Soroko
authors.forename: V P
authors.initials: VP
authors.lastname: Rozhkov
mesh_terms: D000293:Adolescent; D000375:Aging / Q000502:physiology*; D001110:Arctic Regions; D002560:Cerebrovascular Circulation / Q000502:physiology*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D012426:Russia; D012621:Seasons