Muscle, SkeletalMuscle ContractionMusclesMuscle Fibers, SkeletalIsometric ContractionMuscle ProteinsSarcomeresMuscle FatigueTroponin CTroponinMuscle, SmoothMyosinsElectric StimulationTropomyosinRabbitsMuscle Fibers, Fast-TwitchMyofibrilsCalciumMuscle DevelopmentMuscle Fibers, Slow-TwitchMuscle DenervationMuscle, Smooth, VascularMitochondria, MuscleRegional Blood FlowMuscular AtrophyHindlimbElectromyographyMuscle RelaxationPhysical Conditioning, AnimalMuscle SpindlesBiomechanical PhenomenaRats, WistarRats, Sprague-DawleyHindlimb SuspensionConnectinGlycogenMotor NeuronsMyosin Heavy ChainsMyocardial ContractionTime FactorsTendonsPhysical ExertionMuscular DiseasesCatsMyocardiumLegSatellite Cells, Skeletal MuscleRana temporariaAnkle JointMyostatinPhosphocreatineMyocytes, Smooth MusclePsoas MusclesQuadriceps MuscleOrgan SizeMuscle, StriatedMuscle CellsMuscle WeaknessPhysical EndurancePapillary MusclesNeck MusclesOculomotor MusclesBody WeightInsulinAnuraRNA, MessengerOxygen ConsumptionUterine ContractionRunningMusculoskeletal Physiological PhenomenaAdenosine TriphosphateStress, MechanicalActinsModels, BiologicalEnergy MetabolismRespiratory MusclesCachexiaAgingTorqueDiaphragmMuscular Dystrophy, AnimalKineticsElasticityNeuromuscular JunctionMyoblastsCells, CulturedHypertrophyRana pipiensCitrate (si)-SynthaseSarcolemmaAbdominal MusclesHeartIsotonic ContractionSarcoplasmic ReticulumMice, Inbred C57BLAdaptation, PhysiologicalExerciseGlucoseRats, Inbred StrainsSignal Transduction