What does pump handle movement increase in the thorax?

The pump handle movement primarily relates to the mechanics of respiration, specifically how the ribs move during inhalation. This movement involves the elevation of the upper ribs, which effectively increases the antero-posterior diameter of the thoracic cavity. As the ribcage expands forward and upward, the anterior and posterior dimensions become more pronounced, allowing for greater lung capacity and more efficient air intake.

The importance of this movement is particularly evident during deep breathing, where maximizing the antero-posterior space allows for improved ventilation. This is a crucial aspect of respiratory function and aligns well with the principles of Pilates, which emphasize awareness of breath and its impact on body movement and stability.