Posture and discomfort assessment in computer users while using touch screen device as compared with mouse-keyboard and touch pad-keyboard

BACKGROUND: Touch screen computers require significant arm and hand movements. This can result to body discomfort and biomechanical load in users. OBJECTIVES: This study was carried out to examine posture and users’ discomfort while using touch screen device as compared with mouse-keyboard and touch pad-keyboard. METHODS: Twenty three (23) students participated in this experimental study. The subjects completed pre-defined tasks in three 15 min trials by means of touch screen, touch pad-keyboard and mouse-keyboard as input devices. Postural angles were measured by Qualisys motion capture system. Body discomfort was assessed by a 10-cm visual analog scale. Rating scale was employed to assess the perception of subjects on the posture of body parts while utilizing the three devices. RESULTS: There was no significant difference in head inclination when using the three types of devices. Nevertheless, the mean of neck (p = 0.005) and trunk (p