HeartMusclesMuscle ProteinsMyocardiumHeart RateMuscle, SkeletalMuscle, SmoothPapillary MusclesMuscle Fibers, SkeletalMuscle, Smooth, VascularMuscle DevelopmentMuscle ContractionMyocardial ContractionHeart FailureHeart DiseasesMitochondria, MuscleMuscle FatigueMuscle Fibers, Fast-TwitchMuscle DenervationMyofibrilsMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleMyocytes, CardiacHeart TransplantationHeart Defects, CongenitalCardiomyopathiesNeck MusclesOculomotor MusclesCalciumCardiomyopathy, DilatedMuscle, StriatedRabbitsMuscle SpindlesHeart AtriaMuscle RelaxationTime FactorsRespiratory MusclesMuscle WeaknessMuscle CellsFetal HeartAbdominal MusclesQuadriceps MuscleCells, CulturedCreatine KinaseElectric StimulationMasseter MuscleRats, Sprague-DawleyHeart ValvesRats, WistarFacial MusclesMasticatory MusclesDogsSarcomeresRNA, MessengerGuinea PigsIntercostal MusclesElectromyographyMuscular AtrophyIsometric ContractionAnuraAction PotentialsFMRFamideSarcolemmaMyocarditisMembrane PotentialsPerfusionCatsSarcoplasmic ReticulumKineticsSatellite Cells, Skeletal MuscleHeart InjuriesHeart VentriclesRegenerationCardiomegalyPectoralis MusclesOxygen ConsumptionMitochondria, HeartEndocardiumMuscular DiseasesAdenosine TriphosphateHeart BlockVentricular FunctionOrgan SpecificityCardiomyopathy, RestrictiveMicroscopy, ElectronMyocardial IschemiaMolecular Sequence DataPhenylisopropyladenosineIsoproterenolPotassiumMyosin Heavy ChainsCitrate (si)-SynthaseModels, BiologicalPsoas MusclesEnergy MetabolismModels, CardiovascularTissue DistributionHindlimbActinsCardiotonic Agents