Isokinetic force-power profile of the shoulder joint in males participating in CrossFit training and competing at different levels

PeerJ

article

Maximiliano A. Torres-Banduc¹  Daniel Jerez-Mayorga⁴  Jason Moran⁵  Justin W.L. Keogh⁶  Rodrigo Ramírez-Campillo^1,10 

[1] Escuela de Kinesiología, Facultad de Ciencias de la Salud, Universidad de Las Americas;Escuela de Ciencias de la Salud, Universidad de Viña del Mar;Department Physical Education and Sports. Faculty of Sport Sciences, University of Granada;Facultad de Ciencias de la Rehabilitación, Universidad Andres Bello;School of Sport, Rehabilitation and Exercise Sciences, University of Essex;Faculty of Health Sciences and Medicine, Bond University;Sports Performance Research Centre New Zealand, AUT University;Cluster for Health Improvement, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast;Kasturba Medical College;Department of Physical Activity Sciences, Universidad de Los Lagos

关键词: Injuries;    Strength training;    Resistance training;    Human physical conditioning;    Sports;    Plyometric exercise;    Athletic performance;    Physical education and training;    Exercise therapy;    Return to sport;   

DOI  :  10.7717/peerj.11643

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Background As participants who engage in CrossFit training and competition perform a large volume of high intensity overhead activities, injuries to the shoulder are one of the most common in this sport. Previous research in other sports has indicated that the isokinetic force power profile of the shoulder joint (IPSJ) rotator muscles may assist in the prediction of shoulder injury. Aim Therefore, the objective of this study was to determine the IPSJ in males engaged in CrossFit training at different competitive levels. Methods In a cross-sectional study design, participants (age, 24.1 ± 2.7 years) classified as ‘beginner’ (n = 6), ‘intermediate’ (n = 7) or ‘advanced’ (n = 9) provided informed consent to participate in this study. The IPSJ assessment involved rotational and diagonal movements, including internal and external shoulder rotator muscles, at both 180°.s−1 and 300°.s−1. The variables analysed were peak torque/body mass (%), mean power (W) and the external/internal peak torque/body mass ratio (%). A Kruskal–Wallis test was used to compare the IPSJ of the three groups, with Dunn’s test used for post-hoc analysis. The alpha level was set at p < 0.05. Results The IPSJ showed greater torque and power values in those who competed at the advanced level as compared to those at a lower competitive level (i.e. intermediate, beginner). This was observed mainly for the internal rotation and internal diagonal movements at both 180°.s−1 and 300°.s−1. However, such differences between competitive levels were, in general, absent for the external rotation and external diagonal movements. Moreover, the participants from the advanced competitive level exhibited an imbalance of peak torque between the muscles responsible for the external–internal rotational and external-internal diagonal movements of the shoulder (i.e. peak torque external/internal ratio <66%), particularly in the dominant shoulder. Conclusion These findings suggest greater development of the shoulder internal rotators and a higher probability of shoulder injury in CrossFit athletes at the advanced competitive level. Based on these results, participants engaged in CrossFit training and competition may wish to increase the volume of training for the shoulder external rotator muscles to complement the large increases in shoulder internal rotator strength that occur as a part of their regular training regimes.

【 授权许可】

CC BY