Abstract: Shoulder impingement syndrome is a common complication that causes pain, functional disability and reduced activity level. This syndrome is usually seen in people who are involved in activities and sports involving rotating movements above the head, including bodybuilders. Meanwhile, corrective exercises have been considered as an intervention in the rehabilitation of the condition. Exercises based on NASM principles are known as one of the new methods in the rehabilitation and prevention of sports injuries. Therefore, the purpose of this study was to investigate the effect and sustainability of corrective exercises on upper limbs kinematics of bodybuilders with shoulder impingement syndrome. In this semi-experimental research with a pre-test-post-test design, 20 male bodybuilders with shoulder impingement syndrome were randomly assigned to two groups; 10 men in corrective exercises and 10 men as the experimental group. To Assessment the kinematic parameters (angular displacement and angular velocity during flexion, abduction and internal and external rotation of the arm), from the videography method and Kinovea software was used. The evaluations carried out during three stages; the pre-test, the first post-test (after eight weeks) and the second post-test (after 12 weeks) were conducted. Data were analyzed using descriptive statistics, independent t-test and analysis of covariance at a significance level of 0.05 using SPSS version 20 software. The findings showed that after eight weeks of corrective exercises, there were significant changes in shoulder kinematic parameters during flexion, abduction, external rotation and internal rotation movements were observed between the two groups (p<0.05). Sustainability of the exercises in the studied variables after 12 weeks showed a significant difference between the two groups (p<0.05). According to the obtained results, it can be stated that a course of NASM exercises increased kinematic parameters in male bodybuilders with shoulder impingement syndrome. Therefore, it can be stated that by using the designed training protocol, the range of motion and angular velocity of the shoulder girdle joints can be increased. Especially in bodybuilders who suffer from shoulder impingement syndrome and need to do a lot of strength and repetitive overhead movements in their training programs, it can lead to the improvement of their performance.
