Torque and Force Production during Shoulder External Rotation: Differences between Transverse and Sagittal Planes

in Journal of Applied Biomechanics

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Joelly Mahnic de ToledoFederal University of Rio Grande do Sul

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Roberto Costa KrugFederal University of Rio Grande do Sul

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Marcelo Peduzzi CastroFederal University of Rio Grande do Sul

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Daniel Cury RibeiroFederal University of Rio Grande do Sul

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Jefferson Fagundes LossFederal University of Rio Grande do Sul

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In joints with 3 degrees of freedom, such as the shoulder joint, the association of different movements results in changes in the behavior of the moment arm of the muscles. The capacity of torque production for the same movement can be changed when movements take place in a different plane. The objective of this study is to quantify differences between torque production and resultant force estimated during the shoulder external rotation in two movement planes: the transverse and sagittal planes (with 90° of shoulder abduction). Eight individuals were evaluated using an isokinetic dynamometer and an eletrogoniometer for movements in the transverse plane and six individuals for movements in the sagittal plane. The results showed that the execution of the external rotation in the sagittal plane allowed greater torque magnitudes and resultant force compared with those in the transverse plane, probably owing to a prestretching of infraspinatus and teres minor.

The authors are with the Physical Education School, Federal University of Rio Grande do Sul, Porto Alegre City, RS, Brasil.

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