Neuromuscular DiseasesRespiratory InsufficiencyMuscular DystrophiesMyotonic DystrophyHypoventilationMuscular Dystrophy, DuchenneRespiratory MusclesTracheostomyNADH Tetrazolium ReductaseMuscular Atrophy, SpinalNeuromuscular Junction DiseasesMuscular Dystrophy, FacioscapulohumeralTracheotomyRespiratory TherapyRespiration, ArtificialArthrogryposisInsufflationIntermittent Positive-Pressure VentilationMasksMyasthenia GravisSpinal Muscular Atrophies of ChildhoodMuscular DiseasesHereditary Sensory and Motor NeuropathyMuscle, SkeletalPositive-Pressure RespirationMyographyVentilators, MechanicalOphthalmoplegiaMuscle WeaknessAmyotrophic Lateral SclerosisRespiration DisordersSMN Complex ProteinsSurvival of Motor Neuron 1 ProteinGuillain-Barre SyndromeElectric ImpedanceMyositisCoughVentilator WeaningDystrophinMuscle Fibers, SkeletalMusclesCharcot-Marie-Tooth DiseaseSleep Apnea SyndromesMuscular AtrophyScoliosisMice, Inbred mdxMucusRespiratory Function TestsVital Capacity