Isometric ContractionMuscle ContractionMuscle, SkeletalMusclesMuscle Fibers, SkeletalMuscle FatigueMuscle, SmoothElectromyographyMuscle ProteinsMuscle, Smooth, VascularElectric StimulationIsotonic ContractionTorqueMuscle RelaxationMuscle DevelopmentMyocardial ContractionUterine ContractionCalciumMuscle Fibers, Fast-TwitchElbowMotor NeuronsRecruitment, NeurophysiologicalSarcomeresQuadriceps MuscleMuscle Fibers, Slow-TwitchPapillary MusclesRabbitsBiomechanical PhenomenaTime FactorsMuscle SpindlesMyosinsMyofibrilsMitochondria, MuscleKneePsoas MusclesMuscle StrengthPhysical EndurancePhysical ExertionMuscle DenervationVasoconstrictionHindlimbMuscle WeaknessMusculoskeletal Physiological PhenomenaMyocytes, Smooth MuscleGuinea PigsRats, WistarRana temporariaPhosphocreatineRats, Sprague-DawleyVolitionTracheaPotassium ChlorideAdenosine TriphosphateMasseter MuscleExerciseMuscular AtrophySatellite Cells, Skeletal MuscleStress, MechanicalLegMuscle, StriatedActinsDose-Response Relationship, DrugNeck MusclesAnuraAcetylcholineModels, BiologicalMyographyThighMuscle CellsMuscular DiseasesTendonsOculomotor MusclesMyosin Light ChainsPhenylephrineCatsAction PotentialsMyocardiumElasticityKineticsRespiratory MusclesAbdominal MusclesEnergy MetabolismVasoconstrictor AgentsDiaphragmReflex, StretchDogsNorepinephrineAnkle JointMuscle Strength DynamometerMyosin Heavy ChainsAgingOxygen ConsumptionGlycogenEvoked Potentials, MotorRana esculentaAorta, ThoracicSarcoplasmic ReticulumCells, CulturedMovementRegional Blood Flow