How breathing mechanics contribute to lower back pain

The diaphragm is not just a breathing muscle. It is the roof of the intra-abdominal pressure system, a cylinder of pressure created by the coordinated action of the diaphragm (top), pelvic floor (bottom), and deep abdominals (sides) that stabilises the lumbar spine during load.

When this system functions correctly, lumbar load is distributed through the pressure cylinder rather than concentrated in the passive structures (discs, facets, ligaments). When it does not function correctly, through dysfunctional breathing patterns, lumbar load distribution worsens.

Upper chest breathing (shoulders rise with each breath, minimal lateral rib expansion) bypasses the diaphragm's full excursion. The diaphragm does not fully descend, intra-abdominal pressure is poorly generated, and the lumbar spine stabilises less efficiently.

This pattern is common in people with chronic stress, desk workers with restricted thoracic mobility (thoracic stiffness prevents full rib expansion), and athletes who have not been cued to breathe into the lower thorax and abdomen.

People with chronic lower back pain show altered breathing patterns in research literature, specifically, reduced diaphragmatic function and greater reliance on upper chest and accessory respiratory muscles. Whether this is a cause or consequence is debated, but clinically, improving breathing mechanics consistently improves lower back pain outcomes when combined with loading.

The mechanism: better intra-abdominal pressure management reduces the load on passive lumbar structures per movement. The disc and facet joints share the load with the pressure cylinder rather than receiving all of it.

Diaphragmatic breathing retraining: lying supine, one hand on chest, one on abdomen. Inhale so the abdomen hand rises first and the chest hand moves minimally. Exhale fully. Practice 10 minutes daily.

Once the breathing pattern is established in lying, it needs to be integrated into loaded positions: kneeling, standing, and eventually loaded exercise. The goal is coordinated breathing under load, not just correct breathing at rest.