Strength Values of Shoulder Internal and External Rotators in Elite Volleyball Players

in Journal of Sport Rehabilitation
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Objective:

To determine concentric shoulder external-internal rotator strength, dominant and non-dominant shoulder differences and agonist/antagonist ratios.

Design:

A transversal study of isokinetic dynamometry of healthy shoulders, 95% confidence intervals are presented.

Participants:

35 asymptomatic elite, male volleyball players.

Measurements:

Peak torque normalized for body weight was recorded at 60, 180, and 300°/sec. with a Cybex 6000 dynamometer.

Results:

(1) internal rotators were significantly stronger than external rotators of the same shoulder; (2) internal rotators of the dominant arm were significantly stronger than of the non-dominant arm; (3) no difference existed between external rotators of the dominant and the non-dominant arm; (4) external–internal rotator ratios of the dominant arm were significantly lower than of the non-dominant arm; and (5) no differences were found between the ratios of each arm separately.

Conclusions:

Data presented are important for interpreting isokinetic shoulder rotator strength tests in elite volleyball players and could be relevant in rehabilitation and prevention of shoulder injuries.

Robert van Cingel is with Sports Medical Center Papendal, Arnhem 6816 VD, Netherlands. Email: r.vancingel@planet.nl. Gertjan Kleinrensink is with the University of Rotterdam, Dept. Neuroscience, Rotterdam, Netherlands. Rob Stoeckart is with The Erasmus University Rotterdam, Dept. of Neuroscience, Rotterdam, Netherlands. Geert Aufdemkampe is with the University of Professional Education, Faculty of Health Care, Utrecht, Netherlands. Rob de Bie is with The Maastricht University, Dept. of Epidemiology, Maastricht, Netherlands. Harm Kuipers is with The Maastricht University, Dept. of Movement Sciences, Maastricht, Netherlands.