Bed RestHead-Down TiltWeightlessness SimulationWeightlessness CountermeasuresRestCardiovascular DeconditioningSpace FlightBedsWomenWomen's HealthWeightlessnessOrthostatic IntoleranceLower Body Negative PressureTime FactorsBed OccupancyPregnant WomenBattered WomenMuscle, SkeletalSupine PositionMuscular AtrophyPlasma VolumeEarly AmbulationExercisePregnancyHypotension, OrthostaticHypovolemiaWomen's Health ServicesVascular CapacitanceWomen's RightsAmino Acids, EssentialImmobilizationTreatment OutcomeSpinal PunctureUterine Cervical Incompetence