Muscle ContractionMusclesMuscle, SkeletalMuscle, SmoothIsometric ContractionMuscle, Smooth, VascularMuscle Fibers, SkeletalMuscle ProteinsMuscle FatigueElectromyographyElectric StimulationMuscle RelaxationMyocardial ContractionCalciumUterine ContractionMuscle DevelopmentIsotonic ContractionTorqueMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchRabbitsBiomechanical PhenomenaMuscle SpindlesPapillary MusclesVasoconstrictionTracheaMyosinsSarcomeresMyocytes, Smooth MuscleGuinea PigsMuscle DenervationTime FactorsMotor NeuronsNeck MusclesQuadriceps MuscleMuscle, StriatedMitochondria, MusclePotassium ChlorideMyosin Light ChainsHindlimbMuscle WeaknessAcetylcholinePhysical ExertionPsoas MusclesDose-Response Relationship, DrugMyofibrilsActinsMuscle StrengthRats, Sprague-DawleyTropomyosinAbdominal MusclesRats, WistarOculomotor MusclesPeristalsisMuscle TonusTroponin CRespiratory MusclesVasoconstrictor AgentsMyographyDiaphragmStress, MechanicalPhenylephrineAdenosine TriphosphateMuscle CellsModels, BiologicalCarbacholElbowMasticatory MusclesActomyosinExerciseKneeDogsGastrointestinal MotilityHand StrengthFacial MusclesCatsUrinary BladderNorepinephrineReflexrho-Associated KinasesNeuromuscular JunctionPhysical EnduranceMovementLegRana temporariaRecruitment, NeurophysiologicalTendonsTroponinAorta, ThoracicAnuraCaffeineMasseter MuscleMyocardiumPhosphocreatineVolitionMuscular AtrophyIleumActin CytoskeletonKineticsCells, Cultured