• While the muscle energy technique (MET) of quadratus lumborum (QL) significantly improves QL function, its impact on breathing dysfunction is unknown. The effect of MET of QL on pulmonary parameters was evaluated in the present research. Each metric comprising pain, surface electromyography (EMG) of the diaphragm, Pimax, and chest expansion shows a significant improvement. The carryover effect of MET on QL as well as other accessory muscles of breathing is recommended for further research 

Studies have proven that in low back pain, the breathing pattern is abnormal. To keep our body balanced, several muscles work in harmony. However, in low back pain, this coordination is lost and leads to imbalance, which, in turn, leads again to complications that are more obvious than breathing abnormality, and if left untreated, may worsen the back pain and breathing. Therefore, to overcome this problem, we divided patients with low back pain, with or without breathing abnormality based on the score of one questionnaire used for breathing. Both groups were treated with a manual therapy session used in physiotherapy practices. The muscle chosen was quadratus lumborum (QL), which is a core stabilizer, as well as the accessory muscle for breathing. Pre and post-evaluation of parameters, such as the capacity of lungs to expand, the strength of primary muscle of breathing in terms of pressure exerted while inhalation, and the physiological changes during inhalation. We found positive results after one session of manual therapy. It proves that if we focus on the correction of breathing in any musculoskeletal condition, it will be beneficial to the better prognosis of the complaint and also help to prevent future consequences.