SHOULDER ISOKINETIC PROFILE IN YOUNG NONATHLETES
Journal Title: Issues of Rehabilitation, Orthopaedics, Neurophysiology and Sport Promotion-IRONS - Year 2016, Vol 16, Issue 16
Abstract
Introduction The glenohumeral joint is one of the most complex joints of human body. It allows one to perform complex movements in all planes. In the literature there are few studies on the shoulder isokinetics in nonath-letes. Usually, the research would concern the throwing shoulder in young athletes. Aim The aim of the study was to define the isokinetic profile of the shoulder in external and internal rotation in nonathletes. These persons were chosen among students with an average fitness level, with no injuries in upper extremities, so could be assumed as a representative trial in population. We were aware of the fact that our group had a limited number but research in commonly accepted papers devoted to shoulder isokinetics had been performed using a similar number of volunteers. Material and methods Thirty volunteers with healthy shoulders (16 women and 14 men, age 20–25 years) have been tested using Biodex ® dynamometer. Internal and external rotation of the shoulder at 90°/sec (3 reps), 180°/sec (3 reps), 270°/sec (15 reps), 360°/sec (3 reps) angular speeds were tested. Results In statistical analysis peak torque, average power, total work and agonist-antagonist ratio were taken into consideration. The mean value of muscle peak torque for the dominant extremity in external rotation at 90°/sec. angular speed was 20.6 J and in internal rotation it was 30.3 J. For the non-dominant extremity the mean value of muscle peak torque in external rotation at 90°/sec. the angular speed was 19.0 J and in internal rotation it was 28.4 J. The mean muscle total work in dominant extremity’s external rotation at 270°/sec. the angular speed (the largest number of repetitions per serie) was 246.1 J and in internal rotation it was 407.4 J. For the non-dominant extremity the mean muscle total work in external rotation was 203.4 J and for the external rotation it was 374.1 J.Muscle average power for the dominant extremity in external rotation and at 270°/sec. the angular speed was 27.0 W and in internal rotation it was 44.0 W. For the nondominant extremity, muscle average power in external rotation was 21.5 W and in internal rotation it was 40.1 W. Conclusions The results have shown that all parameters were higher in dominant extremities in comparison to the non-dominant. Muscle peak torque, power and work were higher in internal rotation than in external rotation. Agonist-antagonist ratio of internal to external rotators was within the range of 68.8%–85.8% and was higher in dominant extremity. The results were coherent with those obtained by other researchers and can be used as auxiliary data in further shoulder joint isokinetics research.
Authors and Affiliations
Jakub Przybyła, Maciej Bręborowicz, Przemysław Lubiatowski, Leszek Romanowski
Keywords
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- EP ID EP197510
- DOI 10.19271/IRONS-00020-2019-16
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