Abstract

CASTRO, Marcelo P. et al. Model for force and moment prediction of shoulder external rotation muscles in the transverse plane. Rev. Port. Cien. Desp. [online]. 2008, vol.8, n.2, pp.259-270. ISSN 1645-0523.

Estimate the shoulder muscles forces and understand how much each muscle the moment production during joint movement is indispensable for the knowledge of the human movement, as well as, for the rehabilitation planning of patients with shoulder dysfunction. For this reason, the goal of the present study is to estimate the muscle force and to analyze the contribution of the following muscles: Infraspinatus, Teres Minor, Supraspinatus, Deltoideus Posterior and Deltoideus Medialis during dynamic external rotation of the shoulder in the transverse plane. So, an optimization model structured in the software MATLAB 7.0 (MathWork Inc., Massachusetts - the USA) was used to estimate the force and moment production of each the shoulder external rotators muscles. The muscles Infraspinatus and Teres Minor reached the following peak moment, respectively: 22 Nm (20º of internal rotation) and 6 Nm (28º of internal rotation). The force magnitudes reached by these muscles were 996 N for the Infraspinatus and 306 N for the Teres Minor, both at 31° of internal rotation. The muscles Supraspinatus, Deltoideus Posterior and Deltoideus Medialis presented low magnitudes for external rotation moment and force. These results suggested Infraspitatus and Teres Minor muscles are preferentially recruited during external rotation of the shoulder.

Keywords : shoulder; moment; muscle force and optimization model.

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