Rectus Abdominis
The rectus abdominis primarily produces mild posterior pelvic tilt and depression of the ribs or sternum. Rectus dominance during exhalation depresses and holds the sternum, preventing pump handle motion during inhalation. The rectus abdom…
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The rectus abdominis primarily produces mild posterior pelvic tilt and depression of the ribs or sternum. Rectus dominance during exhalation depresses and holds the sternum, preventing pump handle motion during inhalation. The rectus abdominis activates readily during high-effort or fast expiratory efforts. Chronic rectus dominance may contribute to structural changes at the manubriosternal joint. The rectus abdominis attaches from the pubic symphysis to the xiphoid process and rib costal cartilages.