Posterior Thorax Expansion

The term 'posterior mediastinum' as used clinically refers to the entire posterior thoracic region rather than the mediastinum itself, which contains no contractile element. The core principle for improving posterior thorax expansion is closing the front of the rib cage so inhaled air is redirected posteriorly. Posterior expansion means the back side of the ribcage opens during inhalation. Closing the anterior lower ribs with abdominal tension and forward reach helps direct air into the back. The posterior thorax expands through a coordinated combination of muscular activation and lung pressure that elevates ribs posteriorly and superiorly. Scapular distraction may help the back of the thorax stretch and expand when the scapulae are tightly held to the posterior ribcage. Adequate tension in the posterior thoracic region allows proper expansion and limits how far the diaphragm descends. A sidelying position with forward reach and inhalation, modified by Lucy Hendrix, is cited as a practical and effective method for posterior thorax expansion. Inability to achieve posterior thoracic excursion may cause the diaphragm to descend beyond its normal physiological range. Manual sternal pr…