Isometric ContractionMuscle ContractionElectric StimulationMuscle, SkeletalMusclesMuscle FatigueElectromyographyMuscle, SmoothMuscle Fibers, SkeletalTorqueIsotonic ContractionElectric Stimulation TherapyMyocardial ContractionMuscle, Smooth, VascularMotor NeuronsUterine ContractionMuscle RelaxationRecruitment, NeurophysiologicalElbowCalciumTime FactorsMuscle ProteinsBiomechanical PhenomenaKneeMuscle StrengthSarcomeresCatsQuadriceps MuscleRabbitsMyosinsPapillary MusclesVasoconstrictionGuinea PigsMuscle SpindlesAction PotentialsPhysical EndurancePsoas MusclesPhysical ExertionRats, Sprague-DawleyMusculoskeletal Physiological PhenomenaVolitionReflexHindlimbRats, WistarDose-Response Relationship, DrugAcetylcholineMyofibrilsTracheaPotassium ChlorideNorepinephrineEvoked Potentials, MotorPhenylephrineMuscle Fibers, Fast-TwitchAdenosine TriphosphateStress, MechanicalRana temporariaLegThighMyographyDogsMotor CortexPhosphocreatineMovementMuscle DevelopmentTranscranial Magnetic StimulationMyosin Light ChainsModels, BiologicalReflex, StretchMuscle Fibers, Slow-TwitchVasoconstrictor AgentsPhysical StimulationAtropineTendonsNeural ConductionMuscle WeaknessAnkle JointElectrophysiologyElasticityAnuraHandFingersMuscle DenervationMasseter MuscleActinsUrinary BladderExerciseMuscle Strength DynamometerAnalysis of VarianceStimulation, ChemicalTranscutaneous Electric Nerve StimulationHeart RateGastrointestinal MotilityKineticsAorta, ThoracicMuscle TonusCells, CulturedArmPeristalsisCarbacholHand Strength