title: [Calcium pooling by plasma and extra-plasma buffer systems: effects of prolonged hypokinesia].
abstract: Healthy test subjects were intravenously injected with calcium solutions during ambulatory activity and after 100-day exposure to head-down tilt. It was demonstrated that different mechanisms were involved in maintaining ionized calcium at a constant level and that their contribution changed after the tilt study. It was also shown that the capacity of extra plasma pool was decreased, kinetic characteristics of the Ca2+ binding reaction were modified, and responses of mineralotropic hormones to induced hypercalcemia were enhanced.
authors.forename: I M
authors.initials: IM
authors.lastname: Larina
authors.forename: T M
authors.initials: TM
authors.lastname: Smirnova
authors.forename: Iu V
authors.initials: IuV
authors.lastname: Sukhanov
mesh_terms: D000293:Adolescent; D000328:Adult; D002021:Buffers; D002118:Calcium / Q000097:blood / Q000378:metabolism*; D018475:Head-Down Tilt; D006706:Homeostasis; D006801:Humans; D006934:Hypercalcemia / Q000209:etiology*; D018476:Hypokinesia / Q000378:metabolism*; D008297:Male; D013026:Space Flight; D013997:Time Factors; D014893:Weightlessness
chemical_list: D002021:Buffers; D002118:Calcium
vernacular_title: Reaktsiia srochnogo deponirovaniia kal'tsiia plazmennymi i vneplazmennymi bufernymi sistemami: vliianie usloviĭ dlitel'noĭ gipokinezii.