The Main Role of Diaphragm Muscle as a Mechanism of Hypopressive Abdominal Gymnastics to Improve Non-Specific Chronic Low Back Pain: A Randomized Controlled Trial.

Background: Chronic low back pain (LBP) has been stated as one of the main health concerns in the XXI century due to its high incidence.

Objective: The objective of this study was to determine the effects of an 8-week program of hypopressive abdominal gymnastics (HAG) on inspiratory muscle strength, diaphragm thickness, disability and pain in patients suffering from non-specific chronic LBP.

Methods: A total of 40 patients with chronic LBP were randomly divided into two groups.