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Bed RestHead-Down TiltWeightlessness SimulationWeightlessness CountermeasuresRestCardiovascular DeconditioningSpace FlightBedsWeightlessnessOrthostatic IntoleranceLower Body Negative PressurePhysiciansMedical Staff, HospitalBed OccupancyPhysician-Patient RelationsSupine PositionMuscular AtrophyTime FactorsExercisePlasma VolumeEarly AmbulationMuscle, SkeletalHypotension, OrthostaticAttitude of Health PersonnelHypovolemiaFamily PracticeVascular CapacitanceAmino Acids, EssentialImmobilizationQuestionnaires