O exercício de barra fixa executado por praticantes de crossfit e suas relações com lesões na articulação glenoumeral

Objective: investigate relationships between injuries in the glenohumeral joint and the kinematics of the fixed bar movement performed by practitioners of the CrossFit modality. Materials and Methods: 7 advanced practitioners of the modality performed three repetitions of the fixed bar movement and were filmed for data collection regarding the joint angles of the glenohumeral joint. The kinematic analysis was made with the Kinovea® software. Results: The volunteers presented an angle of the glenohumeral joint above 90 ° in the middle phase - the moment when the shoulder is in elevation and abduction -, a position of the high risk of injury by the subacromial impact due to the high degree and a greater tendency technical errors due to fatigue or muscular imbalances, resulting in overload in the shoulder joint. Women achieved lower adduction angles compared to men and presented a shrug of the shoulders, both compensatory actions and prone to impact injuries due to greater activation of the upper trapezius and less activation of the anterior serratus, increased anterior slope of the scapula and predisposition to internal rotation of the humerus. Conclusion: The results indicate a potential for injury to the glenohumeral joint in the barbell exercise using CrossFit techniques, in which a high number of repetitions must be performed. In this way, it is important to plan the training volume in CrossFit and exercises focused on controlling movement, strengthening, repairing possible muscle imbalances and shoulder mobility.