Neuromuscular DiseasesRespiratory InsufficiencyMuscular DystrophiesMyotonic DystrophyHypoventilationMuscular Dystrophy, DuchenneRespiratory MusclesTracheostomyNADH Tetrazolium ReductaseMuscular Atrophy, SpinalNeuromuscular Junction DiseasesMuscular Dystrophy, FacioscapulohumeralTracheotomyRespiratory TherapyRespiration, ArtificialArthrogryposisInsufflationIntermittent Positive-Pressure VentilationMasksMyasthenia GravisMuscular DiseasesSpinal Muscular Atrophies of ChildhoodHereditary Sensory and Motor NeuropathyMuscle, SkeletalPositive-Pressure RespirationMyographyVentilators, MechanicalOphthalmoplegiaMuscle WeaknessRespiration DisordersAmyotrophic Lateral SclerosisSMN Complex ProteinsSurvival of Motor Neuron 1 ProteinGuillain-Barre SyndromeElectric ImpedanceMyositisCoughVentilator WeaningDystrophinMusclesMuscle Fibers, SkeletalCharcot-Marie-Tooth DiseaseSleep Apnea SyndromesMuscular AtrophyScoliosisMucusMice, Inbred mdxRespiratory Function TestsVital Capacity