Effect of Computer Keyboard Slope on Upper Limb Postures at Sitting and Standing ComputerWorkstations : A Pilot Study

A user’s posture at a computer workstation, especially wrist posture, is determined by the keyboard angle. Most commercially available keyboards have built-in positive slope that requires user to extend their approximately 20° when typing. The purpose of this study find negative angles minimize extension for both sitting and standing workstations. In study, we compared upper limb working postures, including those wrist, elbow shoulder, 5 different between −16° +6° in postures. Based on our results, can conclude optimal range from −4° −12° −8° terms minimum extension, typing performance, preference. We also propose universal support design as an attachment currently keyboards.