Function, strength, and muscle activation of the shoulder complex in Crossfit practitioners with and without pain: a cross-sectional observational study.

Autor: Silva ER; Departamento de Fisioterapia, Universidade do Estado de Santa Catarina, Florianópolis, SC, Brasil., Maffulli N; Department of Musculoskeletal Disorders, Faculty of Medicine, Surgery and Dentistry, Salerno, Italy.; Centre for Sports and Exercise Medicine at Queen, Mary University of London, London, UK.; Institute of Science and Technology in Medicine, Keele University School of Medicine, Stoke-on-Trent, UK., Migliorini F; Department of Orthopaedic, Trauma, and Reconstructive Surgery, RWTH Aachen University Hospital, Pauwelsstraße 30, 52074, Aachen, Germany. migliorini.md@gmail.com., Santos GM; Departamento de Fisioterapia, Universidade do Estado de Santa Catarina, Florianópolis, SC, Brasil.; Programa de Pós-Graduação em Fisioterapia, Universidade do Estado de Santa Catarina, Florianópolis, SC, Brasil., de Menezes FS; Departamento de Fisioterapia, Universidade do Estado de Santa Catarina, Florianópolis, SC, Brasil., Okubo R; Departamento de Fisioterapia, Universidade do Estado de Santa Catarina, Florianópolis, SC, Brasil.; Programa de Pós-Graduação em Fisioterapia, Universidade do Estado de Santa Catarina, Florianópolis, SC, Brasil.
Jazyk: angličtina
Zdroj: Journal of orthopaedic surgery and research [J Orthop Surg Res] 2022 Jan 15; Vol. 17 (1), pp. 24. Date of Electronic Publication: 2022 Jan 15.
DOI: 10.1186/s13018-022-02915-x
Abstrakt: Background: The shoulder joint is the most commonly injured joint in CrossFit practitioners, because of the high intensity and loads associated with this sport. Despite the large number of clinical cases, there is a shortage of studies that investigate influence of biomechanical aspects of upper limbs' injuries on CrossFit practitioners. This study hypothesized that there would be a difference in function, strength, and muscle activation between Crossfit practitioners with and without shoulder pain.
Methods: We divided 79 Crossfit practitioners into two groups according to whether they reported pain (n = 29) or no pain (n = 50) in the shoulder during Crossfit training. Muscle function, strength, and activation were assessed using the Disability Arm, Shoulder and Hand function questionnaire, Upper Quarter Y Balance Test and Closed Kinetic Chain Upper Extremity Stability Test shoulder tests, isometric muscle strength assessment by manual dynamometry and muscle activation by surface electromyography and pain report.
Results: The function based on questionnaire was associated with pain (p = 0.004). We observed a statistically significant difference between the two groups only in the surface electromyography activity of the lower trapezius, and in the variables of shoulder pain and function (p = 0.038).
Conclusion: Crossfit practitioners with shoulder pain occurring during training showed good function and stability of the shoulder joint, but there was a reduction in the activation of stabilizing muscles, especially the lower trapezius. Trial registration Registro Brasileiro de Ensaios Clinico (Brasilian National Registry) with the ID: RBR-2gycyv.
(© 2022. The Author(s).)
Databáze: MEDLINE
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