title: Intersystem relationships of respiration and hemodynamics in the initial period of postural effects.
abstract: We studied the dependence of parameters of lung volumes and the elastic properties of the lungs on changes in the central hemodynamics occurring in the initial period of passive postural changes in cats. It was found that transition from the horizontal to head-up and head-down tilting was accompanied by opposite hemodynamic changes in the cranial and caudal parts of the body. Changes in lung compliance and functional residual capacity of the lungs were opposite and linearly depended on the intensity of hemodynamic shifts, which indicates passive character of the primary disorders primarily determined by a physical factor, gravity-dependent redistribution of body fluids.
authors.affiliation: Laboratory of Physiology of Respiration, I. P. Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg; Laboratory of Physiological Problems of Weightlessness, Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow, Russia. zdonina@yahoo.com.
authors.forename: Zh A
authors.initials: ZhA
authors.lastname: Donina
authors.forename: I N
authors.initials: IN
authors.lastname: Lavrova
authors.forename: V M
authors.initials: VM
authors.lastname: Baranov
mesh_terms: D000818:Animals; D002415:Cats; D004548:Elasticity; D005652:Functional Residual Capacity / Q000502:physiology; D006112:Gravitation; D006439:Hemodynamics / Q000502:physiology*; D008170:Lung Compliance / Q000502:physiology; D008176:Lung Volume Measurements; D008954:Models, Biological; D011187:Posture / Q000502:physiology*; D015656:Respiratory Mechanics / Q000502:physiology*