HeartMusclesMuscle ProteinsHeart RateMuscle, SmoothMuscle, SkeletalMuscle Fibers, SkeletalMuscle, Smooth, VascularMuscle DevelopmentMuscle ContractionHeart FailureMuscle FatigueMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchHeart DiseasesMitochondria, MuscleMyocytes, Smooth MuscleHeart TransplantationHeart Defects, CongenitalNeck MusclesOculomotor MusclesPapillary MusclesMuscle, StriatedMuscle SpindlesMuscle RelaxationRespiratory MusclesMuscle WeaknessMuscle CellsFetal HeartAbdominal MusclesMyocardiumQuadriceps MuscleMasseter MuscleTime FactorsHeart ValvesFacial MusclesMasticatory MusclesIntercostal MusclesElectromyographyHeart AtriaMuscular AtrophyIsometric ContractionSatellite Cells, Skeletal MuscleRabbitsPectoralis MusclesCalciumMuscular DiseasesMyocardial ContractionMyofibrilsHeart BlockRats, Sprague-DawleyCells, CulturedElectric StimulationRats, WistarMyosin Heavy ChainsPsoas MusclesHindlimbRNA, MessengerTemporal MuscleHeart Arrest, InducedHeart Function TestsOxygen ConsumptionDogsMyocytes, CardiacGlycogenDiaphragmBiomechanical PhenomenaPharyngeal MusclesHemodynamicsMyocardial IschemiaExerciseMotor NeuronsDisease Models, AnimalMice, Inbred C57BLSarcomeresNeuromuscular JunctionSignal TransductionMuscular Dystrophy, AnimalRegenerationAgingCreatine KinaseActinsMyoblastsPerfusionGuinea PigsCoronary DiseaseSarcolemmaAortaDose-Response Relationship, DrugKineticsGene Expression RegulationMuscle CrampEnergy MetabolismSarcoplasmic ReticulumCardiac Output, LowLegMolecular Sequence DataMice, Inbred mdxImmunohistochemistry