The Effects of Corrective Exercises and Respiratory Biofeedback on the Kyphosis Angle and Electrical Activity of Trapezius Muscles in Male Adolescents With Kyphosis: A Randomized Controlled Trial

Background and Aims: Thoracic kyphosis is a prevalent postural abnormality among adolescents, which can impair musculoskeletal alignment and affect neuromuscular function. Despite the known benefits of corrective exercises, limited attention has been given to the role of respiratory biofeedback. This study aimed to investigate the effects of corrective exercises and respiratory biofeedback on the kyphosis angle and the electrical activity of the trapezius muscles in male adolescents with kyphosis. Methods: = 15). The interventions were delivered for 8 weeks. The control group did not receive any intervention during the study period. Kyphosis angle was measured using a flexible ruler, and surface electromyography was used to assess the electrical activity of upper, middle, and lower trapezius muscles in two stages of pre-test and post-test. Data were analyzed using two-way mixed repeated measures ANOVA and Bonferroni post hoc tests at significance level of 0.05. Results: < 0.05). Conclusion: Eight weeks of corrective exercises or respiratory biofeedback training significantly improved spinal curvature and muscle activity of trapezius muscle in adolescents with kyphosis. These interventions are recommended as effective non-invasive approaches to address postural abnormalities in young populations.