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Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns
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Changes in sitting posture induce multiplanar changes in chest wall shape and motion with breathing.

Linda-Joy Lee1, Angela T Chang, Michel W Coppieters

  • 1Centre for Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Qld 4072, Australia. ljlee@ljlee.ca

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Sitting posture significantly alters chest wall shape and motion during breathing. Even minor posture changes affect ribcage and abdomen contributions to breathing volume, impacting overall chest wall kinematics.

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Area of Science:

  • Biomechanics
  • Respiratory Physiology
  • Human Anatomy

Background:

  • Sitting posture is common in daily life.
  • Posture can influence physiological functions.
  • Understanding posture's effect on breathing mechanics is crucial.

Purpose of the Study:

  • To investigate how different sitting postures affect 3D chest wall shape.
  • To analyze the impact of posture on chest wall motion during breathing.
  • To determine posture's influence on the ribcage and abdomen contributions to breathing volume.

Main Methods:

  • Utilized electromagnetic motion analysis system for chest wall motion.
  • Employed inductance plethysmography to measure ribcage and abdomen contributions to tidal volume.
  • Assessed seven healthy volunteers across seven distinct seated postures.

Main Results:

  • Significant differences in chest wall shape, motion, and ribcage/abdomen contribution (%RC/V(t)) were observed across postures.
  • Thoracolumbar extension posture increased movement at the 9th rib lateral diameter.
  • Slumped posture increased movement at anterior-posterior diameters (T1 and axilla).
  • Rotation postures decreased lateral diameter movement at the axilla.

Conclusions:

  • Postural adjustments alter three-dimensional ribcage configuration and chest wall kinematics.
  • Breathing mechanics are sensitive to subtle changes in sitting posture.
  • Respiratory function is maintained despite postural-induced kinematic changes.