Research in Sports Medicine and Technology

The effect of six weeks of upper extremity perturbation training on eccentric strength of shoulder external rotators and scapula upward rotation in volleyball players prone to upper extremity injury

Articles in Press

Authors

Ebrahim Soltanabadi
Maliheh Hadadnezhad
Mahdi Khaleghi

University of Khrazmi

Abstract
Muscle imbalances in the shoulder are a weakness in the external rotator cuff muscles compared to the internal rotator cuffs, in which the weakness of the external rotator cuff muscles is a risk factor for volleyball players' shoulder injuries. Shoulder dyskinesis can be caused by imbalance of the scapula stabilizing muscles, which improves with muscle coordination the aim of this study was to investigate the effect of perturbation training on eccentric strength of external rotators and scapular kinematics. Twenty-four male volleyball players with a score of less than 30 on CKCUEST test participated in this study, which was randomly divided into two groups of experimental and control. The eccentric strength of the external rotator cuff muscles was measured using an isokinetic at 120 degrees per second. Scapular upward rotation also measured with a dual inclinometer at 45 °, 90 °, 135 ° and the end range of motion of the shoulder abduction. Comparing the experimental and control groups, a significant difference was observed in the shoulder external rotators eccentric strength. There was a significant difference only in 135 ° of scapular upward rotation. In other angles, no significant difference was observed between the two groups. The results showed the positive effect of perturbation training on the eccentric strength of external rotators and scapular upward rotation in arm abduction; therefore, coaches and volleyball players can be advised to add these exercises to their training programs to increase performance and prevent shoulder injuries.

Keywords

Scapular Kinematics
Shoulder
Rotator Cuff Muscle Strength
Scapular Upward Rotation
Scapular Dyskinesis
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Research in Sports Medicine and Technology

Articles in Press, Accepted Manuscript
Available Online from 23 October 2019