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Arm movement coordination when rotating a spherical object

There exist numerous studies investigating arm reaching and grasping movements. However, few focus on arm movements when manipulating an object, such as rotating an object. As the arm is a redundant system, an infinite number of ways exist for grasping and manipulating an object. In order to simulate natural human motion using a digital human model, one has to know the natural coordination between the movements of the joints involved in motion and to implement it in a simulation algorithm. The objective of the present study is to investigate the coordination of the shoulder, elbow and wrist when rotating a spherical object.