Muscle ContractionReflex, StretchMuscle, SkeletalTorqueIsotonic ContractionElectromyographyMuscle FatigueMusclesMuscle StrengthBiomechanical PhenomenaSarcomeresElectric StimulationMuscle Fibers, SkeletalRana temporariaMuscle RelaxationKneeHand StrengthMuscle SpindlesPulmonary Stretch ReceptorsElbowPsoas MusclesPhysical ExertionMyosinsTime FactorsElasticityPapillary MusclesMuscle Strength DynamometerMyocardial ContractionMyographyExerciseMotor NeuronsCalciumMusculoskeletal Physiological PhenomenaMovementRecruitment, NeurophysiologicalPhysical EnduranceVolitionMechanoreceptorsMuscle, SmoothRabbitsVasoconstrictionQuadriceps MuscleTendonsLegRana esculentaStress, MechanicalMuscle Stretching ExercisesAnkle JointFingersKnee JointMuscle TonusAnuraMuscle, Smooth, VascularRange of Motion, ArticularArmThighHindlimbMuscle Fibers, Fast-TwitchHeart RatePhosphocreatineCatsVasoconstrictor AgentsElbow JointAdenosine TriphosphateVasodilationBlood PressureThumbReflexPotassium ChloridePhenylephrineWeight-BearingAcetylcholineDose-Response Relationship, DrugMyosin Light ChainsMuscle WeaknessHeartPhysical StimulationTetanyAchilles TendonEndothelium, VascularModels, BiologicalMechanotransduction, CellularMuscle Fibers, Slow-TwitchTracheaEvoked Potentials, MotorRana pipiensDiacetylAdaptation, PhysiologicalWristAnalysis of VarianceAorta, ThoracicForearmRats, WistarActomyosinVibrationKineticsRats, Sprague-DawleyMotor CortexDiaphragmVasodilator Agents