Muscle ContractionMuscle Fibers, Slow-TwitchMusclesMuscle Fibers, SkeletalMuscle Fibers, Fast-TwitchHypertrophyMuscle, SkeletalMuscle DenervationIsometric ContractionMuscle, SmoothHypertrophy, Left VentricularMuscle ProteinsElectric StimulationMotor NeuronsCardiomegalySarcoplasmic ReticulumNeural ConductionMuscle DevelopmentMyocardiumMuscle, Smooth, VascularMyocardial ContractionMyofibrilsCatsTime FactorsRana temporariaCalciumRabbitsMuscle FatigueNerve FibersMyosin Heavy ChainsNeuromuscular JunctionMuscle RelaxationElectromyographySarcomeresCalcium-Transporting ATPasesDiaphragmUterine ContractionMuscle SpindlesMitochondria, MuscleAnuraPapillary MusclesPsoas MusclesRana pipiensMuscular AtrophyRats, WistarRats, Sprague-DawleyAction PotentialsMuscular DiseasesOculomotor MusclesDietary FiberMembrane PotentialsMyosinsHypertrophy, Right VentricularIsotonic ContractionHeartBiomechanical PhenomenaHindlimbCaffeineMyocytes, Smooth MuscleQuadriceps MuscleMuscle, StriatedCells, CulturedMuscle WeaknessMyocytes, CardiacGuinea PigsMasseter MuscleOrgan SizeMotor EndplateMolecular Sequence DataMuscle CellsThoracicaMuscular Dystrophy, AnimalRespiratory MusclesSatellite Cells, Skeletal MuscleNeck MusclesHeart VentriclesDose-Response Relationship, DrugMasticatory MusclesSarcolemmaBase SequenceAbdominal MusclesHistocytochemistryIntercostal MusclesStress, MechanicalMice, Inbred mdxActinsAcetylcholineMineral FibersPotassiumTorqueSnakesModels, BiologicalMicroscopy, ElectronRanidaeRNA, MessengerMice, Inbred C57BLElectrophysiologySignal TransductionTubocurarineDogs