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With my clients, I observe that ridged abdominals stop diaphragm contraction; this results in a pattern of breathing, called vertical or chest breathing, where the clavicles and upper ribs are elevating. This pattern can severely distort the cervical spine and draw the head forward and into extension, resulting in painful overuse of back muscles, further restricting rib expansion and breath-ability. These are the symptoms, in my opinion, that can lead to a major breakdown of the nocturnal breath machine.