Abdominal MusclesMusclesRectus AbdominisDiaphragmElectromyographyRespiratory MusclesMuscle ContractionCell WallAbdominal WallMuscle, SkeletalIntercostal NervesMuscle ProteinsIntercostal MusclesAbdomenMuscle, SmoothPressureRespiratory MechanicsMuscle, Smooth, VascularMuscle Fibers, SkeletalMuscle FatigueRespirationPostureInhalationPositive-Pressure Respiration, IntrinsicNephropidaeMuscle DevelopmentAbdominal CavityThoraxLordosisLaryngeal MusclesMuscle RelaxationExhalationHypercapniaIsometric ContractionLumbosacral RegionCoughMuscle Fibers, Fast-TwitchMuscle DenervationPelvisMuscle Fibers, Slow-TwitchBiomechanical PhenomenaPulmonary VentilationLung Volume MeasurementsMyocytes, Smooth MuscleMitochondria, MuscleSupine PositionPatient PositioningSpineLow Back PainElectric StimulationAstacoidea