Isometric ContractionMuscle ContractionTetanusMuscle, SkeletalTetanus ToxinTetanus ToxoidMusclesMuscle FatigueElectromyographyMuscle, SmoothTetanus AntitoxinMuscle Fibers, SkeletalIsotonic ContractionTorqueElectric StimulationMyocardial ContractionUterine ContractionMuscle, Smooth, VascularMuscle RelaxationElbowRecruitment, NeurophysiologicalMotor NeuronsCalciumMuscle ProteinsSarcomeresKneeBiomechanical PhenomenaMyosinsMuscle StrengthTime FactorsPapillary MusclesQuadriceps MuscleVasoconstrictionPsoas MusclesPhysical EnduranceRabbitsMuscle SpindlesPhysical ExertionClostridium tetaniMyofibrilsMusculoskeletal Physiological PhenomenaGuinea PigsVolitionTracheaRana temporariaPotassium ChlorideMyographyMuscle Fibers, Fast-TwitchMuscle DevelopmentAcetylcholineDose-Response Relationship, DrugStress, MechanicalPhosphocreatinePhenylephrineMyosin Light ChainsHindlimbAnuraRats, WistarAdenosine TriphosphateMuscle Fibers, Slow-TwitchAction PotentialsElasticityLegCatsThighRats, Sprague-DawleyVasoconstrictor AgentsTendonsModels, BiologicalAnkle JointMuscle WeaknessEvoked Potentials, MotorNorepinephrineActinsMasseter MuscleExerciseReflex, StretchAorta, ThoracicMuscle Strength DynamometerMyocytes, Smooth MuscleRana esculentaMovementDogsPeristalsisHand StrengthReflexHandMuscle DenervationFingersMotor CortexMuscle TonusGastrointestinal MotilityArmForearmKineticsWeight-BearingElbow JointEnergy MetabolismUrinary BladderNeck Muscles