Use of the forearm support reduced shoulder flexor muscle activity, the anterior deltoid and torque; which is consistent with previous studies Forearm supports provide a mechanical ground to reduce the load from the weight of an extended arm on the shoulder muscles. Others reported that only wrist/palm supports affected trapezius and deltoid muscle activity however, their protocol differed from our study in terms of placement and type of the support as well as the tasks completed. In our study, the mouse and mouse pad were placed approximately 18 cm from the edge of the table, thus this may require more anterior deltoid muscle activity in unsupported conditions.