Physical StimulationElectric StimulationElectric Stimulation TherapyStimulation, ChemicalDeep Brain StimulationCatsTranscutaneous Electric Nerve StimulationMuscle ContractionElectrodes, ImplantedTranscranial Magnetic StimulationTime FactorsEvoked PotentialsAction PotentialsRats, Sprague-DawleyReflexVagus NerveMuscle, SkeletalCells, CulturedElectromyographyElectrodesMotor ActivityAfferent PathwaysNeurons, AfferentNeuronsPhysical FitnessCalciumDecerebrate StateResearch PersonnelMotor NeuronsSynaptic TransmissionElectrophysiologySpinal CordNorepinephrineAtropinePhysical Therapy ModalitiesNeural InhibitionSignal TransductionRats, WistarSympathetic Nervous SystemEvoked Potentials, SomatosensoryEvoked Potentials, MotorNeurons, EfferentMusclesMicroelectrodesGuinea PigsPhotic StimulationDose-Response Relationship, DrugMotor CortexAcoustic StimulationDogsNeural ConductionGuanethidineExerciseNeural PathwaysSpinal Cord InjuriesReaction TimeHindlimbCell LineParasympathetic Nervous SystemSelf StimulationRats, Inbred StrainsRabbitsEfferent PathwaysKineticsAnalysis of VarianceSplanchnic NervesPhosphorylationSynapsesMedulla OblongataIsometric ContractionMovementMuscle FatigueEnzyme ActivationNerve FibersIsoproterenolMuscle, SmoothFunctional LateralityAcetylcholinePhentolaminePainCerebral CortexMembrane PotentialsRNA, MessengerTibial NervePhysical ExertionPeroneal NerveHexamethonium CompoundsPhrenic NerveMechanoreceptorsHeart RatePeripheral NervesSomatosensory CortexSubthalamic NucleusNeuronal PlasticitySpinal Nerve RootsMice, Inbred C57BLTetrodotoxinTrigeminal NervePyramidal TractsReticular Formation