Isometric ContractionTorqueMuscle, SkeletalMuscle ContractionMuscle FatigueElectromyographyMuscle StrengthElbowKneeMuscle Strength DynamometerIsotonic ContractionPhysical EnduranceMusclesThighElectric StimulationBiomechanical PhenomenaRecruitment, NeurophysiologicalPhysical ExertionAnkle JointKnee JointMuscle Fibers, SkeletalWeight LiftingMyocardial ContractionTime FactorsMotor NeuronsLegExerciseUterine ContractionSarcomeresMusculoskeletal Physiological PhenomenaMuscle RelaxationPhysical Education and TrainingMuscle, SmoothMyosinsMovementPsoas MusclesVolitionQuadriceps MusclePapillary MusclesAgingRange of Motion, ArticularCalciumRana temporariaVasoconstrictionAnalysis of VarianceMyographyPhosphocreatineStress, MechanicalElasticityMuscle SpindlesRana esculentaMyofibrilsRabbitsMuscle, Smooth, VascularPhenylephrineEvoked Potentials, MotorFingersPotassium ChlorideTendonsAnuraHandAction PotentialsAdenosine TriphosphateMotor CortexForearmHand StrengthThumbElbow JointDose-Response Relationship, DrugGuinea PigsArmReflex, StretchWeight-BearingAcetylcholineCatsFemoral NerveVasoconstrictor AgentsModels, BiologicalAorta, ThoracicMyosin Light ChainsNorepinephrineTracheaMasseter MuscleRats, WistarFeedback, SensoryHindlimbNeural ConductionBupranolol