HindlimbSpinal CordMotor NeuronsMotor CortexEvoked Potentials, MotorMotor ActivityMuscle, SkeletalMolecular Motor ProteinsForelimbIschemiaLocomotionElectromyographyMovementMotor Skills DisordersElectric StimulationPsychomotor PerformanceCatsNeovascularization, PhysiologicMuscle ContractionDecerebrate StateRegional Blood FlowBiomechanical PhenomenaMuscular AtrophyRats, Sprague-DawleyRecovery of FunctionKinesinEfferent PathwaysMusclesSpinal Cord InjuriesExtremitiesTime FactorsMovement DisordersWeightlessness SimulationDisease Models, AnimalAxonsReflexFunctional LateralityLaser-Doppler FlowmetryRecruitment, Neurophysiological