AtrophyMusclesMuscle, SkeletalMuscular AtrophyMuscle ProteinsMuscle, SmoothMuscle Fibers, SkeletalMuscle DevelopmentMuscle ContractionMuscle, Smooth, VascularOptic AtrophyMuscular Atrophy, SpinalMuscle DenervationMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchMitochondria, MuscleMuscle FatigueMultiple System AtrophyMyocytes, Smooth MuscleMuscle, StriatedMuscular DiseasesSpinal Muscular Atrophies of ChildhoodMuscle RelaxationSatellite Cells, Skeletal MuscleOculomotor MusclesNeck MusclesMuscle CellsMuscle WeaknessMyoblastsQuadriceps MuscleMuscle SpindlesRespiratory MusclesPapillary MusclesMyositisHindlimbElectromyographyOlivopontocerebellar AtrophiesAbdominal MusclesMyoblasts, SkeletalPolymyositisMyosin Heavy ChainsMyofibrilsIsometric ContractionMyostatinMasseter MuscleGyrate AtrophyTime FactorsMasticatory MusclesFacial MusclesRNA, MessengerCells, CulturedRabbitsDermatomyositisIntercostal MusclesMuscular Dystrophy, AnimalDiaphragmMuscular Disorders, AtrophicRegenerationMice, Inbred mdxHindlimb SuspensionMagnetic Resonance ImagingGeographic AtrophyDystrophinPectoralis MusclesMyocardiumRats, Sprague-DawleyMuscular DystrophiesOrgan SpecificityElectric StimulationMice, Inbred C57BLActinsCalciumDesminRats, WistarGene Expression RegulationMolecular Sequence DataAgingGlycogenMotor NeuronsSurvival of Motor Neuron 1 ProteinMyoD ProteinImmunohistochemistryDisease Models, AnimalOrgan SizeTracheaNeuromuscular JunctionBiomechanical PhenomenaPsoas MusclesCell Differentiation