Abdominal MusclesMusclesRectus AbdominisExercise TestExercise TherapyElectromyographyDiaphragmRespiratory MusclesMuscle, SkeletalExerciseMuscle ContractionExercise TolerancePhysical ExertionMuscle ProteinsIntercostal NervesRespiratory MechanicsAbdominal WallAbdomenIntercostal MusclesPressureMuscle, SmoothMuscle FatigueRespirationMuscle Fibers, SkeletalPostureMuscle, Smooth, VascularInhalationPositive-Pressure Respiration, IntrinsicNephropidaeMuscle DevelopmentAbdominal CavityThoraxLordosisIsometric ContractionLaryngeal MusclesMuscle RelaxationOxygen ConsumptionExhalationHypercapniaLumbosacral RegionPhysical EnduranceMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchCoughMuscle DenervationMitochondria, MusclePelvisBiomechanical PhenomenaSupine PositionLung Volume MeasurementsTime FactorsLow Back PainMuscle StrengthPulmonary VentilationMyocytes, Smooth MuscleElectric StimulationQuadriceps MusclePatient PositioningSpineNeck MusclesDogsRespiratory Function TestsMovementAstacoideaRecruitment, Neurophysiological