Figure 2

Set-up for EMG-recorded isometric abduction and adduction force tasks. Subjects are positioned in front of the radiographic plate, in standing position with the concerning arm in external rotation at his/her side (i.e. hand in frontal plane), enabling the use of this set-up during concomitant acquirement of standard shoulder radiographs. The arm is attached to a 1-dimensional force transducer at the wrist, enabling subject specific force tasks, visual feedback, and equal task force magnitude for abduction and adduction tasks.