Muscle ContractionMuscle, SkeletalMusclesIsometric ContractionMuscle Fibers, SkeletalElectric StimulationMuscle ProteinsMuscle FatigueMuscle, SmoothMuscle Fibers, Fast-TwitchTroponin CCalciumTroponinMuscle Fibers, Slow-TwitchMyosinsHindlimbElectromyographyRabbitsTropomyosinMyocardial ContractionMotor NeuronsMuscle, Smooth, VascularMuscle DevelopmentMuscle DenervationMyofibrilsMuscle RelaxationRegional Blood FlowMitochondria, MuscleMuscular AtrophyTime FactorsCatsRats, WistarDantroleneGuinea PigsUterine ContractionPhysical Conditioning, AnimalMuscle SpindlesRats, Sprague-DawleyMyocardiumGallamine TriethiodideAction PotentialsGlycogenBiomechanical PhenomenaPhysical ExertionVas DeferensNeural ConductionTendonsHindlimb SuspensionFerretsMuscular DiseasesLegDogsPhosphocreatineMyosin Heavy ChainsAnkle JointNeuromuscular JunctionDiaphragmMyocytes, Smooth MuscleTorquePapillary MusclesQuadriceps MuscleSatellite Cells, Skeletal MuscleMyostatinMembrane PotentialsPhysical EnduranceMuscle WeaknessOrgan SizeMuscle, StriatedVasoconstrictionIsotonic ContractionOculomotor MusclesOxygen ConsumptionDose-Response Relationship, DrugSarcomeresMuscle CellsNeck MusclesAdenosine TriphosphateBody WeightSarcoplasmic ReticulumRespiratory MusclesInsulinRNA, MessengerTracheaMusculoskeletal Physiological PhenomenaRunningRecruitment, NeurophysiologicalAgingEnergy MetabolismAbdominal MusclesPotassium ChlorideKineticsCells, CulturedCachexiaMyoblastsAcetylcholineExerciseMuscular Dystrophy, AnimalSarcolemmaActinsRats, Inbred Strains