Table 2. Tentative suggestions for wise use of MTSD.

▪ Avoid excessive total usage ▪ Avoid prolonged static postures ▪ Use opportunities to vary whole body, head/neck and upper extremity postures during MTSD use ▪ Avoid awkward postures during prolonged or repetitive use ▪ Position MTSD at a height to balance head/neck and upper extremity stress–holding a MTSD at around eye level encourages neutral head/neck posture but increases upper extremity loading; holding a MTSD at around waist/lap level increases head/neck flexion but reduces upper extremity loading ▪ For longer durations of use, support MTSD at a tilt angle (e.g. with the use of device accessories) to balance head/neck and upper extremity stress–a higher tilt encourages neutral head/neck posture and is good for viewing only tasks; a lower tilt allows lower wrist and finger stresses and is good for tasks requiring finger or thumb input ▪ Avoid high repetition of movements such as prolonged typing or swiping on MTSD ▪ Avoid forceful exertions such as holding larger or heavy MTSD in one hand for long durations