Muscle, SkeletalMusclesMuscle ProteinsMuscle, SmoothMuscle Fibers, SkeletalMuscle, Smooth, VascularMuscle DevelopmentMuscle ContractionMuscle FatigueMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleMitochondria, MuscleNeck MusclesOculomotor MusclesMuscle, StriatedMuscle SpindlesMuscle RelaxationMuscle WeaknessRespiratory MusclesPapillary MusclesAbdominal MusclesQuadriceps MuscleMuscle CellsMasseter MuscleFacial MusclesMasticatory MusclesElectromyographyIntercostal MusclesMuscular AtrophyIsometric ContractionSatellite Cells, Skeletal MuscleTime FactorsPectoralis MusclesMuscular DiseasesPsoas MusclesRabbitsMyofibrilsHindlimbElectric StimulationTemporal MuscleBiomechanical PhenomenaCells, CulturedCalciumMyosin Heavy ChainsReproducibility of ResultsPharyngeal MusclesDiaphragmMotor NeuronsRats, Sprague-DawleyGlycogenNeuromuscular JunctionRNA, MessengerExerciseMuscular Dystrophy, AnimalAgingMyoblastsMuscle CrampActinsRats, WistarLegModels, BiologicalPhysical ExertionAnalysis of VarianceRegenerationSarcomeresMice, Inbred mdxMyocardiumMuscle Stretching ExercisesMyostatinKineticsMyoD ProteinInsulinPhysical EnduranceOxygen ConsumptionMuscle RigiditySignal TransductionWeights and MeasuresQuestionnairesMice, Inbred C57BL