Isometric ContractionMuscle ContractionMuscle, SkeletalElectromyographyMuscle FatigueElbowIsotonic ContractionTorqueMusclesRecruitment, NeurophysiologicalElectric StimulationMotor NeuronsMuscle Fibers, SkeletalKneeMuscle StrengthMyocardial ContractionBiomechanical PhenomenaUterine ContractionMusculoskeletal Physiological PhenomenaArmSarcomeresPhysical EnduranceTenodesisMuscle RelaxationVolitionMuscle, SmoothTendonsTime FactorsQuadriceps MuscleMyosinsPsoas MusclesPhysical ExertionPapillary MusclesElbow JointReflex, StretchCalciumThighRana temporariaMyographyVasoconstrictionAnkle JointMuscle SpindlesEvoked Potentials, MotorLegStress, MechanicalPhosphocreatineElasticityMotor CortexRana esculentaMyofibrilsRabbitsMovementAction PotentialsForearmMuscle, Smooth, VascularTendon InjuriesSupinationHandWeight-BearingPhenylephrineMuscle Strength DynamometerFingersPotassium ChlorideExerciseAnuraHindlimbKnee JointReflexCatsMasseter MuscleAdenosine TriphosphateHand StrengthThumbDose-Response Relationship, DrugGuinea PigsModels, BiologicalAcetylcholineFemoral NerveNeural ConductionVasoconstrictor AgentsAnalysis of VarianceRange of Motion, ArticularAorta, ThoracicTranscranial Magnetic StimulationMyosin Light ChainsNorepinephrineTracheaMuscle WeaknessRats, WistarFeedback, SensoryRotator CuffAdaptation, PhysiologicalArm InjuriesVibrationBupranololRats, Sprague-DawleyFootRuptureAgingEnergy Metabolism