Muscle, SkeletalMuscle ContractionMuscle Fibers, SkeletalMusclesMuscle ProteinsIsometric ContractionMuscle FatigueMuscle, SmoothMuscle StrengthMuscle WeaknessMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchMuscular DiseasesMuscle, Smooth, VascularMuscle DevelopmentMice, Inbred mdxCalciumPhysical Conditioning, AnimalExercise TolerancePhysical EnduranceMitochondria, MuscleRespiratory MusclesOxygen ConsumptionMuscle RelaxationMuscle DenervationElectromyographyExerciseAgingElectric StimulationMuscular AtrophyProtein IsoformsRabbitsMuscle, StriatedMyofibrilsMice, KnockoutMice, Inbred C57BLQuadriceps MuscleSatellite Cells, Skeletal MuscleMyocytes, Smooth MuscleHindlimbDiaphragmMuscle SpindlesNeck MusclesMyocardial ContractionOculomotor MusclesPapillary MusclesDisease Models, AnimalBiomechanical PhenomenaTime FactorsMuscle CellsAbdominal MusclesUterine ContractionSarcomeresMyosin Heavy ChainsHeart FailureFacial MusclesMuscular Dystrophy, AnimalRats, WistarRats, Sprague-DawleyMyosinsGlycogenMasticatory MusclesIntercostal MusclesMasseter MuscleIsotonic ContractionPhysical ExertionActinsSarcoplasmic ReticulumTropomyosinTracheaMyoblastsMyocardiumPectoralis MusclesCells, CulturedMotor NeuronsNeuromuscular JunctionGuinea PigsVasoconstrictionTorqueRNA, MessengerDystrophinModels, BiologicalPsoas MusclesMuscular Dystrophy, DuchenneSarcolemmaMyostatinPotassium ChlorideDose-Response Relationship, DrugLegAdenosine TriphosphateKineticsAcetylcholineSignal TransductionEnergy MetabolismPhosphorylationTroponinInsulinTroponin CRegenerationRyanodine Receptor Calcium Release Channel