Computer Mouse Position as a Determinant of Posture and Muscular Load in Normal Subjects

Abstract

Background Computer mouse become an integral part of office work. The number of studies examined the impact of mouse use on musculoskeletal health is limited. The purpose of this study was to compare kinematics of the right upper extremity and the electromyographic activities of upper, lower trapezii, and anterior deltoid muscles in two different computer mouse positions. Subjects: Thirty subjects (15 males, and 15 females), mean age was (22.16±10.92). They were assigned in one group. They assumed one position for fifteen minutes (The traditional one) and then take a recording. After that they assumed the second position (The modified one) for other 15 minutes and take other recording. The recording includes, EMG registered from each selected muscle and capturing of the subject's posture by Infrared cameras. Results: There was a statistically significant decrease in the right upper extremities angles in the modified position except for the wrist ulnar deviation which increase significantly in this position. There was also significant decrease in muscular activities in this position except for lower trapezius. Positive correlation in this position between upper trapezius and shoulder abduction was found. Discussion and conclusion: Modified mouse position decreased most upper extremity angles and the muscular load over the upper, lower trapezius and anterior deltoid muscles and so it is recommended to be used in computer workstations in different fields.