Isometric ContractionMuscle ContractionMuscle, SkeletalMusclesMuscle FatigueElectromyographyMuscle, SmoothMuscle Fibers, SkeletalIsotonic ContractionTorqueElectric StimulationMyocardial ContractionUterine ContractionMuscle, Smooth, VascularElbowMuscle RelaxationRecruitment, NeurophysiologicalMotor NeuronsMuscle ProteinsCalciumSarcomeresKneeBiomechanical PhenomenaMyosinsMuscle StrengthPapillary MusclesTime FactorsQuadriceps MuscleVasoconstrictionPsoas MusclesPhysical EnduranceMuscle SpindlesRabbitsPhysical ExertionMusculoskeletal Physiological PhenomenaMyofibrilsVolitionGuinea PigsTracheaPotassium ChlorideMyographyMuscle DevelopmentStress, MechanicalRana temporariaMuscle Fibers, Fast-TwitchPhenylephrineAcetylcholineMyosin Light ChainsDose-Response Relationship, DrugPhosphocreatineHindlimbRats, WistarAdenosine TriphosphateElasticityLegThighMuscle Fibers, Slow-TwitchVasoconstrictor AgentsTendonsCatsAction PotentialsRats, Sprague-DawleyModels, BiologicalAnuraAnkle JointMuscle WeaknessEvoked Potentials, MotorActinsNorepinephrineMasseter MuscleExerciseReflex, StretchAorta, ThoracicMuscle Strength DynamometerMyocytes, Smooth MuscleMovementPeristalsisHand StrengthReflexDogsHandFingersMotor CortexRana esculentaMuscle DenervationGastrointestinal MotilityMuscle TonusArmForearmWeight-BearingElbow JointUrinary BladderNeck MusclesEnergy MetabolismMuscle, StriatedCarbacholAnalysis of VarianceMitochondria, MuscleKineticsMyocardium