Muscle ContractionMusclesMuscle, SmoothIsometric ContractionMuscle, SkeletalMuscle ProteinsMuscle, Smooth, VascularMuscle Fibers, SkeletalMuscle DevelopmentMuscle FatigueUterine ContractionMyocardial ContractionMuscle RelaxationMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchElectric StimulationMyocytes, Smooth MuscleElectromyographyCalciumMitochondria, MuscleMuscle SpindlesPapillary MusclesNeck MusclesOculomotor MusclesMuscle, StriatedGuinea PigsRespiratory MusclesMuscle WeaknessVasoconstrictionQuadriceps MuscleRabbitsAbdominal MusclesMuscle CellsMasseter MuscleMasticatory MusclesFacial MusclesIsotonic ContractionTime FactorsIntercostal MusclesTracheaMyofibrilsMotor NeuronsPotassium ChlorideRats, Sprague-DawleyMuscular AtrophyRats, WistarDose-Response Relationship, DrugBiomechanical PhenomenaAcetylcholineCells, CulturedHindlimbSatellite Cells, Skeletal MuscleTorqueUrinary BladderGastrointestinal MotilityMuscular DiseasesPsoas MusclesPectoralis MusclesVasoconstrictor AgentsNorepinephrineDiaphragmDogsActinsMyocardiumPeristalsisAorta, ThoracicSarcomeresNeuromuscular JunctionCatsCarbacholAtropineMyosin Heavy ChainsCaffeineIleumPhenylephrinePhysical ExertionPotassiumAortaTemporal MuscleNifedipineAdenosine TriphosphateMembrane PotentialsAction PotentialsGlycogenSarcoplasmic ReticulumVas DeferensPharyngeal MusclesHeartEnzyme InhibitorsArteriesReflexrho-Associated KinasesLegCalcium Channel BlockersSignal TransductionRNA, MessengerStress, MechanicalPhysical EnduranceModels, Biological