title: [Cardiac output in the ontogeny of young rats].
abstract: A differentiated rheogram was recorded in anesthetized rats at the age of 1, 3, 5, 7, 11, 14, 21, 30, 42, 49, 70 and 100 days. Their cardiac output was found to increase with advancing age and played a major part in an increase of the minute-volume output, being more important than the heart rate. The minute-volume of the circulation as related to 100 g body weight proved to be a constant parameter during postnatal ontogenesis. The specific resistance of the blood and the hematocrit increased with advancing age, the dependence of the former on the latter having been expressed by a worked out formula.
authors.forename: R R
authors.initials: RR
authors.lastname: Nigmatullina
authors.forename: F G
authors.initials: FG
authors.lastname: Sitdikov
authors.forename: R A
authors.initials: RA
authors.lastname: Abzalov
mesh_terms: D000375:Aging / Q000502:physiology; D000818:Animals; D000831:Animals, Newborn; D002302:Cardiac Output; D002307:Cardiography, Impedance / Q000379:methods; D006400:Hematocrit; D051381:Rats / Q000254:growth & development*; D013318:Stroke Volume; D014655:Vascular Resistance
vernacular_title: Serdechnyĭ vybros v ontogeneze u krysiat.