Muscle ContractionMuscle, SkeletalSarcoplasmic ReticulumMuscle Fibers, SkeletalMusclesIsometric ContractionMuscle ProteinsTroponin CTroponinCalciumRabbitsMyosinsMuscle FatigueTropomyosinElectric StimulationMuscle, SmoothCalcium-Transporting ATPasesRegional Blood FlowMuscle, Smooth, VascularMuscle DevelopmentSarcoplasmic Reticulum Calcium-Transporting ATPasesMuscle Fibers, Fast-TwitchMyocardial ContractionRyanodine Receptor Calcium Release ChannelMuscle Fibers, Slow-TwitchCaffeineMitochondria, MuscleMyofibrilsMyocardiumRyanodineMuscle RelaxationUterine ContractionCalsequestrinAdenosine TriphosphateMuscle DenervationKineticsElectromyographySatellite Cells, Skeletal MuscleTime FactorsMuscular DiseasesMuscular AtrophySarcolemmaCalcium SignalingHindlimbMuscle CellsCalcium ChannelsRats, WistarGuinea PigsCalcium-Binding ProteinsRats, Sprague-DawleySarcomeresMyocytes, Smooth MusclePapillary MusclesMuscle, StriatedPhosphorylationDogsGlycogenMuscle SpindlesPotassium ChlorideQuadriceps MuscleVasoconstrictionCells, CulturedMyosin Heavy ChainsTracheaActinsHeartCa(2+) Mg(2+)-ATPaseDiaphragmMembrane PotentialsPhysical ExertionDose-Response Relationship, DrugModels, BiologicalExcitation Contraction CouplingMuscle WeaknessMyosin Light ChainsAdenosine TriphosphatasesBiomechanical PhenomenaMyoblastsRNA, MessengerPotassiumCalcium Channels, L-TypeMotor NeuronsNeck MusclesOculomotor MusclesMagnesiumRuthenium RedInsulinAcetylcholineNeuromuscular JunctionMolecular Sequence DataIsotonic ContractionExerciseAnuraSignal TransductionDantroleneMyocytes, CardiacPsoas MusclesRespiratory MusclesPhysical Conditioning, AnimalPhosphocreatine