Abdominal MusclesMuscle DevelopmentMusclesMuscle, SkeletalRectus AbdominisDiaphragmElectromyographyRespiratory MusclesMuscle ContractionMuscle ProteinsMuscle Fibers, SkeletalMuscle, SmoothIntercostal NervesAbdominal WallIntercostal MusclesAbdomenRespiratory MechanicsPressureMyoD ProteinMuscle FatigueMuscle, Smooth, VascularMyoblastsRespirationMyoblasts, SkeletalPosturePositive-Pressure Respiration, IntrinsicInhalationNephropidaeMyogenic Regulatory FactorsGene Expression Regulation, DevelopmentalMuscle Fibers, Fast-TwitchAbdominal CavityMuscle Fibers, Slow-TwitchLordosisMyogeninThoraxMyogenic Regulatory Factor 5Laryngeal MusclesMuscle RelaxationMuscle DenervationMuscle, StriatedExhalationHypercapniaLumbosacral RegionIsometric ContractionMuscle CellsCoughPectoralis MusclesCell DifferentiationPelvisMyostatinFacial MusclesEmbryo, NonmammalianSatellite Cells, Skeletal MuscleMyofibrilsPulmonary VentilationBiomechanical PhenomenaMyocytes, Smooth MuscleMuscular DiseasesLung Volume MeasurementsMyosin Heavy ChainsMitochondria, MuscleSomitesPatient PositioningSupine PositionLow Back PainSpineAstacoideaElectric StimulationTime Factors