DeFreitag, V.Vitti, M.2014-05-262014-05-261981-01-01Electromyography and Clinical Neurophysiology, v. 21, n. 5, p. 479-485, 1981.0301-150Xhttp://hdl.handle.net/11449/63516The participation of the trapezius (pars media) and rhomboideus major muscles were studied electromyographically in movements of lateral and medial rotation (free and against resistance) of the arm. In the majority of cases both muscles were inactive during the performance of the analysed movements. Cases in which only one or both muscles acted in free rotation occurred only at the second half or ending of the movement. Records of electrical potentials during against resistance rotation were due to tensional efforts at the shoulder level.479-485engarm movementelectromyographyhuman cellmusclemusculoskeletal systemnormal humanrhomboideus major muscletrapezius muscleAdultArmBiomechanicsElectromyographyHumanMaleMovementMuscle ContractionSupport, Non-U.S. Gov'tArtigoAcesso restrito2-s2.0-0019458605