Breathing Mechanics and Spinal Health: Why How You Breathe Matters More Than You Think

Breathing is the one autonomic function that is also under voluntary control. This dual nature makes it a uniquely powerful therapeutic tool: it is a direct access point to the autonomic nervous system, it reflects the current nervous system state moment to moment, and it can be consciously changed in ways that produce measurable physiological effects.

For spinal health specifically, breathing mechanics matter at multiple levels. The diaphragm is anatomically connected to the lumbar spine through the crura, the muscular attachments that originate on the anterior aspect of the L1 to L3 vertebrae. The thoracic spine is the kinematic partner of the ribcage, meaning thoracic mobility and breathing mechanics are inseparably linked.

Diaphragmatic vs Accessory Breathing

Optimal breathing engages the diaphragm as the primary respiratory muscle, producing an expansion that moves outward in all directions from the lower ribcage. Accessory breathing, the pattern adopted by most chronically stressed people, uses the secondary respiratory muscles including the scalenes, sternocleidomastoid and upper trapezius to lift the ribcage upward rather than expanding it outward.

The clinical consequences of chronic accessory breathing are significant: sustained overactivity of the scalenes and upper trapezius produces the chronic cervical and upper thoracic tension that is one of the most common musculoskeletal presentations in practice. The restriction of lower thoracic and lumbar expansion alters the function of the diaphragm as a lumbar stabiliser.

The Diaphragm as a Spinal Stabiliser

The diaphragm is now recognised as an important lumbar spine stabiliser. During lifting, the diaphragm contracts isometrically while the thorax is braced, contributing to the intra-abdominal pressure that supports the lumbar spine under load. When diaphragmatic function is compromised by chronic accessory breathing patterns, this stabilising contribution is reduced, altering load distribution in the lumbar spine and increasing demand on passive structures.

At Clifton Chiro in Bristol, breathing assessment and retraining is a routine component of care for patients with chronic cervical or lumbar presentations. Restoring diaphragmatic breathing mechanics addresses one of the most common and most underappreciated drivers of persistent musculoskeletal dysfunction.

References

Kolar P et al. Postural function of the diaphragm in persons with and without chronic low back pain. Journal of Orthopaedic and Sports Physical Therapy. 2012.

Hodges PW, Gandevia SC. Changes in intra-abdominal pressure during postural and respiratory activation. Journal of Applied Physiology. 2000.

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Tim Scott is the Principal Chiropractor at Clifton Chiro, with over 26 years of experience in healthcare.