MusclesMuscle ProteinsMuscle, SmoothMuscle, SkeletalLow Back PainBack PainMuscle Fibers, SkeletalMuscle, Smooth, VascularBackMuscle DevelopmentMuscle ContractionMuscle FatigueMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleMitochondria, MuscleNeck MusclesOculomotor MusclesMuscle, StriatedMuscle SpindlesMuscle RelaxationMuscle WeaknessRespiratory MusclesPapillary MusclesAbdominal MusclesQuadriceps MuscleBack InjuriesMuscle CellsMasseter MuscleElectromyographyFacial MusclesMasticatory MusclesIntercostal MusclesMuscular AtrophyIsometric ContractionSatellite Cells, Skeletal MusclePectoralis MusclesMuscular DiseasesPsoas MusclesMyofibrilsTime FactorsHindlimbTemporal MuscleRabbitsBiomechanical PhenomenaElectric StimulationCells, CulturedCalciumMyosin Heavy ChainsPharyngeal MusclesDiaphragmMotor NeuronsGlycogenNeuromuscular JunctionRats, Sprague-DawleyRNA, MessengerMuscular Dystrophy, AnimalMyoblastsMuscle CrampActinsRats, WistarLegPhysical ExertionRegenerationExerciseMice, Inbred mdxSarcomeresMyostatinMyoD ProteinMyocardiumMuscle Stretching ExercisesLumbosacral RegionKineticsMuscle RigidityModels, BiologicalPhysical EnduranceSignal TransductionPosturePain MeasurementAgingGene Expression RegulationHypertrophyMovementMolecular Sequence DataAortaTendonsThighDystrophinInsulinMice, Inbred C57BLMembrane PotentialsMyoblasts, SkeletalCatsTorqueHindlimb SuspensionOxygen ConsumptionImmunohistochemistryAnuraGuinea Pigs