Abdominal MusclesMusclesRectus AbdominisElectromyographyDiaphragmRespiratory MusclesMuscle ContractionMuscle, SkeletalIntercostal NervesAbdominal WallPostureMuscle ProteinsPressureIntercostal MusclesAbdomenMuscle, SmoothRespiratory MechanicsBiomechanical PhenomenaMuscle FatigueMuscle Fibers, SkeletalRange of Motion, ArticularMuscle, Smooth, VascularRespirationPositive-Pressure Respiration, IntrinsicInhalationNephropidaeMovementLordosisMuscle DevelopmentIsometric ContractionAbdominal CavityThoraxMuscle RelaxationLaryngeal MusclesLumbosacral RegionKnee JointExhalationHypercapniaPelvisNeck MusclesSpineCoughMuscle Fibers, Fast-TwitchContractureMuscle DenervationPatient PositioningLow Back PainSupine PositionElectric StimulationMuscle Fibers, Slow-TwitchPulmonary VentilationMyocytes, Smooth MuscleLung Volume MeasurementsMuscle StrengthMitochondria, MuscleMuscle WeaknessQuadriceps MuscleRecruitment, NeurophysiologicalPhysical ExertionAstacoideaMuscle Spindles