Muscle, SkeletalMuscle ContractionMusclesMuscle Fibers, SkeletalMuscle ProteinsIsometric ContractionMuscle FatigueMuscle, SmoothTroponin CTroponinElectric StimulationMuscle Fibers, Fast-TwitchMuscle DevelopmentMuscle, Smooth, VascularMyosinsMuscle Fibers, Slow-TwitchMuscle DenervationRabbitsTropomyosinCalciumMitochondria, MuscleElectromyographyHindlimbMuscular AtrophyRegional Blood FlowMuscle SpindlesMuscle RelaxationMotor NeuronsPhysical Conditioning, AnimalMyofibrilsTendonsMyocytes, Smooth MuscleGlycogenBiomechanical PhenomenaRats, WistarPhysical ExertionRats, Sprague-DawleyTime FactorsCatsLegMuscular DiseasesReflex, StretchHindlimb SuspensionMuscle, StriatedSatellite Cells, Skeletal MuscleMuscle WeaknessNeck MusclesOculomotor MusclesQuadriceps MuscleAnkle JointMyosin Heavy ChainsPapillary MusclesMyostatinMuscle CellsRespiratory MusclesPhosphocreatinePhysical EnduranceAbdominal MusclesTorqueBody WeightOrgan SizeRNA, MessengerMusculoskeletal Physiological PhenomenaInsulinAchilles TendonRunningFacial MusclesOxygen ConsumptionMyocardial ContractionNeuromuscular JunctionMasticatory MusclesMasseter MuscleMyoblastsAgingMyocardiumLocomotionDiaphragmSarcomeresEnergy MetabolismMuscular Dystrophy, AnimalCells, CulturedReflexExerciseHypertrophyAnkleUterine ContractionIntercostal MusclesSkinfold ThicknessCachexiaAdenosine TriphosphateRecruitment, NeurophysiologicalCitrate (si)-SynthaseMuscle SpasticityTibial NervePsoas MusclesMice, Inbred mdxActinsMice, Inbred C57BLKineticsGlucose