Muscle, SkeletalMuscle ContractionHindlimbMusclesAnkle JointElectromyographyMuscle Fibers, Fast-TwitchMuscular AtrophyTendonsPhysical Conditioning, AnimalMuscle DenervationMuscle Fibers, Slow-TwitchHindlimb SuspensionEquinus DeformityLegMuscle Fibers, SkeletalIsometric ContractionAnkleMotor NeuronsMuscle FatigueMuscle ProteinsCatsBiomechanical PhenomenaAchilles TendonMitochondria, MuscleGlycogenElectric StimulationRunningPhysical ExertionMuscle Stretching ExercisesOrgan SizeRats, Sprague-DawleyLocomotionRats, WistarTarsus, AnimalMotor Neurons, GammaMusculoskeletal Physiological PhenomenaTibial NervePhosphocreatineMyostatinGaitBody WeightSpace FlightTorqueMuscle SpindlesKneeFootTime FactorsAthletic TapeH-ReflexCitrate (si)-SynthaseCachexiaInjections, IntramuscularMuscle TonusPhysical EnduranceMyosin Heavy ChainsMuscle SpasticityBotulinum Toxins, Type AWalkingRats, Inbred F344Neural ConductionRecruitment, NeurophysiologicalImmobilizationNeurons, AfferentReflex, MonosynapticNeuromuscular AgentsMuscular Disorders, AtrophicMuscle DevelopmentSciatic NervePostureWeightlessnessOxygen ConsumptionMyofibrilsAdaptation, PhysiologicalGalliformesCapillary ActionRange of Motion, ArticularLeg InjuriesWeightlessness SimulationLower ExtremityCreatine Kinase, MM FormEnergy MetabolismAgingRegional Blood FlowReflexIsotonic ContractionCapillariesInsulinHistocytochemistryRats, Inbred StrainsSubtalar JointFoot Deformities, AcquiredSKP Cullin F-Box Protein LigasesFasciaLactic AcidKnee JointRats, Inbred BNWeightlessness CountermeasuresIschemiaMuscular Diseases