Effects of muscle energy technique for quadratus lumborum on respiratory muscle strength in patients with breast cancer

• Main Authors: Andrea Milena Espinosa-López, Jorge Enrique Daza-Arana, Lina Marcela Pinzón-Sanabria, Yuleidy Perdomo-Quiroga, Jhoana Patricia Ruiz-Jiménez
• Format: Article
• Language: English
• Published: Universidad Nacional de Colombia 2019-10-01
• Series: Revista de la Facultad de Medicina
• Subjects: breast cancer; pressure; muscle strength; respiratory muscles
• Online Access: https://revistas.unal.edu.co/index.php/revfacmed/article/view/68950

Introduction: Breast cancer is a major cause of morbidity and mortality, leading to functional deficiencies in ventilation, muscle performance, balance and posture. Objective: To describe the effects of the muscle energy technique (MET) for quadratus lumborum on maximal inspiratory pressure (MIP) and maximal expiratory pressure (MEP) in patients with stage I and II breast cancer. Materials and methods: Quasi-experimental study with a pretest-posttest design conducted in 10 patients treated at a highly specialized healthcare center in Bogotá. Physical therapy assessment and three physiotherapy sessions with the MET to measure MIP and MEP were carried out before and after the intervention using a respiratory pressure meter. Results: The average MIP was 41% of the reference value at the beginning of the intervention, which increased to 69% at the end of the sessions. On the other hand, the initial average MEP was 33%, while the post-intervention average MEP was 51%. The average change rate for MIP was 68% and 57% for MEP. The Wilcoxon signed-rank test was performed, achieving a statistically significant difference (z=-2.807, p=0.005). Conclusion: Applying the MET on the quadratus lumborum muscle improves its performance and increases respiratory muscle strength.