Muscle Fibers, SkeletalMuscle, SkeletalMuscle Fibers, Fast-TwitchMuscle ContractionMusclesMuscle Fibers, Slow-TwitchCalciumMuscle ProteinsMuscle DevelopmentRana temporariaMuscle DenervationMyofibrilsMuscle FatigueMitochondria, MuscleMyosin Heavy ChainsMuscle, SmoothIsometric ContractionRana pipiensSarcomeresPsoas MusclesSarcoplasmic ReticulumNerve FibersMuscular Dystrophy, AnimalMuscular AtrophyMice, Inbred mdxMuscle, Smooth, VascularMuscular DiseasesSarcolemmaSatellite Cells, Skeletal MuscleElectric StimulationMyoblastsRabbitsNeuromuscular JunctionDystrophinMuscle RelaxationAnuraMembrane PotentialsHindlimbTime FactorsRanidaeCaffeineMyosinsRana esculentaDiaphragmRegenerationMice, Inbred C57BLDietary FiberGlycogenMuscle SpindlesOculomotor MusclesMotor EndplateCobra Cardiotoxin ProteinsKineticsQuadriceps MuscleMuscle, StriatedTroponin CMuscle WeaknessRyanodine Receptor Calcium Release ChannelMyoD ProteinNADH Tetrazolium ReductaseCells, CulturedMotor NeuronsRNA, MessengerCitrate (si)-SynthasePhysical Conditioning, AnimalMyoblasts, SkeletalReceptors, CholinergicAction PotentialsTroponinMyogeninProtein IsoformsThoracicaElectrophysiologyHistocytochemistryMuscular Dystrophy, DuchenneRats, WistarAgingMuscle CellsNeck MusclesBiomechanical PhenomenaAdenosine TriphosphateMasseter MuscleMyocytes, Smooth MuscleCreatine KinaseModels, BiologicalElectromyographyTetracaineIsotonic ContractionNaphthalenesulfonatesArsenazo IIIGene Expression RegulationRespiratory MusclesMineral FibersMyogenic Regulatory FactorsMicroscopy, ElectronImmunohistochemistryMuscular DystrophiesActinsClenbuterolMice, Transgenic