AtrophyMuscular AtrophyMuscle, SkeletalMuscle ProteinsHindlimb SuspensionMusclesSKP Cullin F-Box Protein LigasesMuscular Disorders, AtrophicMuscle Fibers, SkeletalMuscular Atrophy, SpinalOptic AtrophyMuscle DenervationMyostatinMuscle, SmoothMuscle ContractionMultiple System AtrophySpinal Muscular Atrophies of ChildhoodMuscle DevelopmentMuscle, Smooth, VascularMuscle Fibers, Slow-TwitchMuscle Fibers, Fast-TwitchImmobilizationMuscle WeaknessMuscle FatigueMitochondria, MuscleOlivopontocerebellar AtrophiesSatellite Cells, Skeletal MuscleCachexiaUbiquitin-Protein LigasesOrgan SizeGyrate AtrophyQuadriceps MuscleMuscular DiseasesMyosin Heavy ChainsSurvival of Motor Neuron 1 ProteinMagnetic Resonance ImagingGeographic AtrophyHindlimbBed RestIsometric ContractionSarcopeniaMuscle CellsMyoblastsMyofibrilsMyocytes, Smooth MuscleDisease Models, AnimalSpace FlightOculomotor MusclesProteasome Endopeptidase ComplexElectromyographyNeck MusclesMyogeninHypertrophySignal TransductionMuscle, StriatedMotor NeuronsRats, Sprague-DawleyMyoblasts, SkeletalOptic Atrophy, Autosomal DominantMuscle SpindlesNeuromuscular DiseasesDiaphragmSMN Complex ProteinsRNA, MessengerRespiratory MusclesMuscle RelaxationMice, TransgenicVelopharyngeal SphincterAgingMice, Inbred C57BLRats, WistarProteolysisGene Expression RegulationTime FactorsWasting SyndromePapillary MusclesAbdominal MusclesInsulin-Like Growth Factor ISurvival of Motor Neuron 2 ProteinMyoD ProteinForkhead Transcription FactorsMice, KnockoutEstivationMasseter MuscleMasticatory MusclesUbiquitinFacial MusclesCells, CulturedNeuromuscular JunctionWeightlessnessBrainIntercostal MusclesProto-Oncogene Proteins c-aktWeightlessness CountermeasuresBulbo-Spinal Atrophy, X-LinkedBody WeightSkeletal Muscle MyosinsLegPectoralis MusclesRegeneration