HeartMusclesHeart RateMuscle ProteinsMuscle, 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 HeartTime FactorsAbdominal MusclesMyocardiumQuadriceps MuscleMasseter MuscleHeart ValvesFacial MusclesMasticatory MusclesProblem SolvingElectromyographyIntercostal MusclesHeart AtriaMuscular AtrophyIsometric ContractionRabbitsSatellite Cells, Skeletal MusclePectoralis MusclesCalciumMuscular DiseasesMyocardial ContractionHeart BlockMyofibrilsRats, Sprague-DawleyCells, CulturedElectric StimulationRats, WistarMyosin Heavy ChainsPsoas MusclesRNA, MessengerHindlimbTemporal MuscleHeart Arrest, InducedDogsOxygen ConsumptionHeart Function TestsBiomechanical PhenomenaMyocytes, CardiacDiaphragmGlycogenExercisePharyngeal MusclesHemodynamicsMyocardial IschemiaSocial ProblemsDisease Models, AnimalRisk FactorsAgingMice, Inbred C57BLSignal TransductionMotor NeuronsModels, BiologicalMolecular Sequence DataRegenerationSarcomeresNeuromuscular JunctionCreatine KinaseActinsMuscular Dystrophy, AnimalKineticsDose-Response Relationship, DrugCoronary DiseasePerfusionMyoblastsGene Expression RegulationGuinea PigsAortaEnergy MetabolismMuscle CrampSarcolemmaLeg