Neuromuscular DiseasesSpinal CordRespiratory InsufficiencyMuscular DystrophiesMyotonic DystrophySpinal Cord InjuriesHypoventilationMuscular Atrophy, SpinalMuscular Dystrophy, DuchenneRespiratory MusclesTracheostomyNADH Tetrazolium ReductaseNeuromuscular Junction DiseasesMuscular Dystrophy, FacioscapulohumeralTracheotomyRespiratory TherapyRespiration, ArtificialArthrogryposisInsufflationSpinal Muscular Atrophies of ChildhoodIntermittent Positive-Pressure VentilationMuscle, SkeletalMasksMyasthenia GravisMuscular DiseasesHereditary Sensory and Motor NeuropathyPositive-Pressure RespirationSMN Complex ProteinsSurvival of Motor Neuron 1 ProteinMyographyInjections, SpinalAmyotrophic Lateral SclerosisVentilators, MechanicalOphthalmoplegiaMuscle WeaknessRespiration DisordersSpinal NervesMotor NeuronsSpinal Cord DiseasesAnesthesia, SpinalScoliosisGuillain-Barre SyndromeElectric ImpedanceSpinal Nerve RootsSpinal Cord NeoplasmsSpinal CanalMyositisMusclesCoughVentilator WeaningSpinal DiseasesSpinal Cord CompressionMuscle Fibers, SkeletalMuscular AtrophyDystrophinCharcot-Marie-Tooth DiseaseSpinal NeoplasmsSleep Apnea SyndromesElectromyographyMice, Inbred mdxMucusRespiratory Function TestsSpinal StenosisVital CapacitySpinal Fusion