Electric Stimulation TherapyMuscle RigidityWristParalysisParaplegiaElectric StimulationSpinal Cord InjuriesArmNeuromuscular JunctionElectromyographyStrokeStimulation, ChemicalDeep Brain StimulationPhysical StimulationTranscranial Magnetic StimulationCells, CulturedTranscutaneous Electric Nerve StimulationTime FactorsSignal TransductionCalciumCatsRats, Sprague-DawleyElectrodes, ImplantedMuscle ContractionPhotic StimulationCell LineAction PotentialsPhosphorylationVagus NerveEnzyme ActivationAcoustic StimulationDose-Response Relationship, DrugKineticsEvoked PotentialsLymphocyte ActivationNeuronsEvoked Potentials, MotorRNA, MessengerIsoproterenolCyclic AMPRats, WistarReflexAtropineNorepinephrineSynaptic TransmissionMotor CortexSubthalamic NucleusAfferent PathwaysElectrophysiologySympathetic Nervous SystemMice, Inbred C57BLNeural InhibitionGuinea PigsSelf StimulationGene Expression RegulationRabbitsDogsNeurons, AfferentEnzyme InhibitorsMuscle, SkeletalElectrodesRats, Inbred StrainsEvoked Potentials, SomatosensorySpinal CordMotor NeuronsProtein Kinase CT-LymphocytesAdrenergic beta-AgonistsMolecular Sequence DataSpinal Cord StimulationMembrane Potentials