SciaticaBed RestHead-Down TiltWeightlessness SimulationIntervertebral Disc DisplacementWeightlessness CountermeasuresRestRadiculopathyCardiovascular DeconditioningSpace FlightBedsPiriformis Muscle SyndromeLumbar VertebraeInjections, EpiduralDiskectomyWeightlessnessLow Back PainChymopapainSupine PositionOrthostatic IntoleranceSpinal Nerve RootsNerve Compression SyndromesLower Body Negative PressureIntervertebral Disc ChemolysisPain MeasurementIntervertebral DiscLumbosacral PlexusPolyradiculopathyTime FactorsPhysiciansFibrocartilageMedical Staff, HospitalCauda EquinaSpinal CanalPeripheral Nervous System NeoplasmsLumbosacral Region