Muscle Strength DynamometerMuscle, SkeletalMuscle StrengthMuscle ContractionMusclesMuscle Fibers, SkeletalMuscle WeaknessIsometric ContractionMuscle ProteinsMuscle FatigueRespiratory MusclesMuscular DiseasesMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchHand StrengthMuscle, SmoothMuscle DevelopmentPhysical EnduranceTorqueMice, Inbred mdxQuadriceps MuscleKneeExercise ToleranceMuscle, Smooth, VascularExerciseAgingBiomechanical PhenomenaOxygen ConsumptionPhysical Conditioning, AnimalMitochondria, MuscleElectromyographyMuscular AtrophyMuscle DenervationRange of Motion, ArticularResistance TrainingCalciumMuscle, StriatedKnee JointSatellite Cells, Skeletal MuscleLegAbdominal MusclesAnkle JointNeck MusclesMice, Inbred C57BLProtein IsoformsMice, KnockoutExercise TherapyMuscle RelaxationDiaphragmSarcopeniaOculomotor MusclesMyocytes, Smooth MuscleTime FactorsMuscle Stretching ExercisesElbowNeuromuscular DiseasesDisease Models, AnimalMyofibrilsHipWeight LiftingPhysical FitnessTensile StrengthHeart FailureMuscular Dystrophy, DuchennePhysical ExertionMyosin Heavy ChainsMuscle CellsExercise TestGaitMuscular Dystrophy, AnimalThighBreathing ExercisesHindlimbPapillary MusclesMuscle SpindlesRabbitsMusculoskeletal Physiological PhenomenaMovementElectric StimulationTendonsMasseter MuscleWalkingIntercostal MusclesMyostatinMuscle SpasticityInspiratory CapacityPhysical Therapy ModalitiesFacial MusclesPectoralis MusclesInhalationPostural BalanceMasticatory MusclesShoulderMuscular DystrophiesGlycogenMyoblastsMyositisDystrophinAnalysis of VarianceBody Composition