Isometric ContractionElbowElbow JointMuscle ContractionMuscle FatigueElectromyographyMuscle, SkeletalIsotonic ContractionTorqueRecruitment, NeurophysiologicalMusclesElectric StimulationKneeMuscle Fibers, SkeletalMuscle StrengthMyocardial ContractionMotor NeuronsBiomechanical PhenomenaUterine ContractionSarcomeresMusculoskeletal Physiological PhenomenaArthroplasty, Replacement, ElbowMuscle RelaxationPhysical EnduranceMuscle, SmoothVolitionTime FactorsMyosinsPsoas MusclesQuadriceps MusclePapillary MusclesPhysical ExertionArmRange of Motion, ArticularCalciumElbow ProsthesisRana temporariaVasoconstrictionMyographyAnkle JointMuscle SpindlesStress, MechanicalTendonsElasticityHandPhosphocreatineThighEvoked Potentials, MotorForearmRana esculentaMuscle Strength DynamometerFingersMyofibrilsRabbitsHand StrengthLegMuscle, Smooth, VascularReflex, StretchMotor CortexPhenylephrinePotassium ChlorideAction PotentialsAnuraWeight-BearingThumbExerciseKnee JointAdenosine TriphosphateDose-Response Relationship, DrugNeural ConductionGuinea PigsCatsDislocationsFeedback, SensoryModels, BiologicalAcetylcholineFemoral NerveVasoconstrictor AgentsAorta, ThoracicAnalysis of VarianceMovementMyosin Light ChainsCollateral LigamentsNorepinephrineTracheaHindlimbMasseter MuscleRats, WistarTranscranial Magnetic StimulationAdaptation, PhysiologicalBupranololPostureMuscle WeaknessReflexHeart RateEnergy MetabolismUlnar NerveSupinationJoint ProsthesisRats, Sprague-Dawley