Muscle, SkeletalMusclesMuscle Fibers, Slow-TwitchMuscle ContractionHindlimb SuspensionMuscle Fibers, Fast-TwitchMuscle Fibers, SkeletalMuscle ProteinsMuscle DenervationMuscular AtrophyMuscle DevelopmentMuscle, SmoothMuscle FatigueH-ReflexHindlimbMuscle, Smooth, VascularMyosin Heavy ChainsMuscle SpindlesIsometric ContractionElectromyographyRats, WistarMitochondria, MuscleElectric StimulationGlycogenImmobilizationClenbuterolMotor NeuronsMyofibrilsReflex, StretchPhysical Conditioning, AnimalCatsRats, Sprague-DawleyTarsus, AnimalTime FactorsOrgan SizeMuscle WeaknessMyocytes, Smooth MuscleMuscle RelaxationInsulinNeuromuscular JunctionRats, Inbred StrainsNeck MusclesOculomotor MusclesMuscular DiseasesGlucoseBiomechanical PhenomenaBody WeightSatellite Cells, Skeletal MuscleMuscle, StriatedRegenerationSarcomeresRespiratory MusclesMuscular Disorders, AtrophicPapillary MusclesLegAnkle JointQuadriceps MuscleRNA, MessengerTendonsPhysical ExertionIsotonic ContractionTibial NerveMuscle CellsWeight-BearingDiaphragmMuscular Dystrophy, AnimalAgingMotor EndplateAbdominal MusclesReflex, MonosynapticCitrate (si)-SynthaseAdaptation, PhysiologicalCalciumDantroleneWeightlessnessMasticatory MusclesDeoxyglucoseMasseter MuscleGlucose Transporter Type 4Skeletal Muscle MyosinsAnkleCordotomyDenervationFacial MusclesRabbitsHistocytochemistryProtein IsoformsRats, Inbred F344Decerebrate StateIntercostal MusclesTorqueSarcolemmaMyostatinHypertrophyPhysical EnduranceAchilles TendonVibrationNeural ConductionLactic AcidMyoD Protein