The diaphragm is the main muscle of respiration — a dome-shaped sheet that separates the thoracic cavity from the abdomen. It contracts and relaxes with each breath, and its health is intimately linked to the vagus nerve and parasympathetic system.
Functions
- •Breathing — primary driver of inhalation
- •Pressure regulation — creates pressure gradient for venous return
- •Core stability — part of the inner unit
- •Vagal stimulation — mechanical massage of the vagus nerve with each breath
In ONDA Life
"Diaphragmatic Release" in Part 1 aims to release spasms in this muscle. Chronic stress and shallow breathing can cause diaphragmatic holding patterns that restrict the vagus nerve and prevent deep parasympathetic recovery.
References
- •Lehrer et al., Appl Psychophysiol Biofeedback (2000) — diaphragmatic breathing and HRV
- •Thayer & Lane, Neurosci Biobehav Rev (2009) — vagal tone and respiration