Muscle ContractionIsometric ContractionMuscle, SkeletalElectromyographyMuscle FatigueVolitionMusclesMuscle, SmoothTorqueElectric StimulationMotor NeuronsRecruitment, NeurophysiologicalElbowEvoked Potentials, MotorUterine ContractionMuscle, Smooth, VascularMuscle SpindlesMuscle Fibers, SkeletalHand StrengthH-ReflexMyocardial ContractionMuscle ProteinsPhysical ExertionQuadriceps MuscleIsotonic ContractionMuscle RelaxationKneeExercisePhysical EnduranceReflexCalciumMuscle StrengthForearmFingersReflex, StretchThumbTime FactorsMotor CortexBiomechanical PhenomenaHandVoluntary ProgramsVasoconstrictionMovementLegPyramidal TractsMuscle DevelopmentReflex, MonosynapticElbow JointGuinea PigsTranscranial Magnetic StimulationNeck MusclesAction PotentialsMotor Neurons, GammaArmWristMuscle Fibers, Fast-TwitchRabbitsTracheaPeroneal NerveMuscle WeaknessMasticatory MusclesAbdominal MusclesHeart RateAdaptation, PhysiologicalMyographyMuscle Fibers, Slow-TwitchAnklePotassium ChlorideTendonsMyocytes, Smooth MuscleNeuromuscular JunctionRegional Blood FlowVibrationPeristalsisDiaphragmBlood PressureTibial NerveStress, MechanicalAnkle JointNeurons, AfferentFemoral NervePhosphocreatineTetanyAcetylcholineDose-Response Relationship, DrugMyosinsGastrointestinal MotilityPapillary MusclesSympathetic Nervous SystemMyosin Light ChainsMuscle DenervationRats, Sprague-DawleyThighPressureMyofibrilsRats, WistarUrinary BladderMuscle, StriatedMitochondria, MuscleAnalysis of Variance