Physical StimulationElectric StimulationElectric Stimulation TherapyStimulation, ChemicalDeep Brain StimulationCatsTranscutaneous Electric Nerve StimulationMuscle ContractionElectrodes, ImplantedTranscranial Magnetic StimulationTime FactorsAction PotentialsEvoked PotentialsReflexRats, Sprague-DawleyVagus NerveMuscle, SkeletalCells, CulturedElectromyographyElectrodesAfferent PathwaysNeurons, AfferentMotor ActivityNeuronsPhysical FitnessCalciumDecerebrate StateMotor NeuronsSynaptic TransmissionElectrophysiologySpinal CordNorepinephrineAtropineNeural InhibitionSympathetic Nervous SystemRats, WistarEvoked Potentials, SomatosensoryPhysical Therapy ModalitiesEvoked Potentials, MotorSignal TransductionNeurons, EfferentMusclesMicroelectrodesGuinea PigsPhotic StimulationMotor CortexDose-Response Relationship, DrugAcoustic StimulationDogsNeural ConductionGuanethidineNeural PathwaysExerciseHindlimbParasympathetic Nervous SystemSelf StimulationReaction TimeSpinal Cord InjuriesRats, Inbred StrainsRabbitsCell LineEfferent PathwaysKineticsSplanchnic NervesPhosphorylationSynapsesMedulla OblongataIsometric ContractionAnalysis of VarianceMuscle FatigueEnzyme ActivationNerve FibersIsoproterenolMuscle, SmoothMovementAcetylcholineFunctional LateralityPhentolamineMembrane PotentialsCerebral CortexTibial NervePhysical ExertionPeroneal NerveRNA, MessengerHexamethonium CompoundsPhrenic NervePainMechanoreceptorsPeripheral NervesHeart RateSomatosensory CortexSubthalamic NucleusSpinal Nerve RootsTetrodotoxinNeuronal PlasticityMice, Inbred C57BLTrigeminal NervePyramidal TractsReticular FormationBrain Stem