Muscle, SkeletalMuscle ContractionElectromyographyMotor NeuronsTendonsAnkle JointCatsIsometric ContractionHindlimbMuscle Fibers, Fast-TwitchTarsus, AnimalAnkleMuscle FatigueMuscle DenervationMusclesElectric StimulationBiomechanical PhenomenaMuscle Fibers, Slow-TwitchReflex, MonosynapticRecruitment, NeurophysiologicalMuscle SpindlesTorqueLocomotionNeural ConductionTibial NerveMotor Neurons, GammaLegDecerebrate StateMuscle Fibers, SkeletalMuscular AtrophyNeurons, AfferentHindlimb SuspensionKneeMuscle Stretching ExercisesFootSural NerveReflex, StretchH-ReflexWalkingAchilles TendonGaitRunningPhysical ExertionTime FactorsRats, WistarMyosin Heavy ChainsPostureGlycogenAction PotentialsRats, Sprague-DawleyElasticityPeroneal NerveOrgan SizeStress, MechanicalCranial Fossa, PosteriorAxonsAdaptation, PhysiologicalSpinal CordReflexEvoked Potentials, MotorJointsRats, Inbred F344Nerve RegenerationMagnetic Resonance ImagingPhysical Conditioning, AnimalEquinus DeformityMotor ActivitySpinal Cord InjuriesRats, Inbred StrainsMuscle ProteinsMedial Collateral Ligament, KneePosterior Cerebral ArteryPosterior Cruciate LigamentKnee JointMitochondria, MuscleRange of Motion, ArticularBrain MappingUveitis, PosteriorHypothalamus, PosteriorMusculoskeletal Physiological PhenomenaPrefrontal CortexPhosphocreatineTibiaMyostatinBody WeightTemporal LobeImage Processing, Computer-AssistedWeight-BearingOssification of Posterior Longitudinal LigamentAnalysis of VarianceNeural PathwaysAthletic TapeSpace FlightCadaverSubtalar JointAgingParietal LobeImmobilizationMuscle TonusSpinal Fusion