Kargar N, Choobineh A R, Razeghi M, Keshavarzi S, Meftahi N
Department of Ergonomics, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
Research Center for Health Sciences, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
Work. 2018;59(3):341-349. doi: 10.3233/WOR-182685.
Touch screen computers require significant arm and hand movements. This can result to body discomfort and biomechanical load in users.
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.
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.
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 < 0.0001) inclinations as well as arm angle (p < 0.0001) while using touch screen, differed significantly from the two other devices and were more deviated from neutral posture. The type of input device was found to have significant effect on the right shoulder (p = 0.017), right elbow (p = 0.031), right wrist/hand (p = 0.004) and whole body discomfort (p = 0.026). Touch screen caused more discomfort in the mentioned regions when compared to the other two devices. Friedman test showed that differences of mean ratings for perceived shoulder and elbow postures in the 3 trials were significant (p = 0.005 and p = 0.011, respectively). Touch screen was the most unfavorable input device based on the subjects' judgment.
Touch screen caused more deviated postural angles, increased body discomfort and unfavorable postures.
触摸屏电脑需要大幅度的手臂和手部动作。这可能导致用户身体不适和生物力学负荷。
本研究旨在考察使用触摸屏设备时与使用鼠标键盘和触摸板键盘相比，用户的姿势和不适情况。
23名学生参与了这项实验研究。受试者通过触摸屏、触摸板键盘和鼠标键盘作为输入设备，在三次15分钟的试验中完成预定义任务。姿势角度由Qualisys运动捕捉系统测量。身体不适通过10厘米视觉模拟量表进行评估。采用评分量表评估受试者在使用这三种设备时对身体部位姿势的感知。
使用这三种类型的设备时，头部倾斜度没有显著差异。然而，使用触摸屏时颈部（p = 0.005）和躯干（p < 0.0001）的倾斜度以及手臂角度（p < 0.0001）的平均值与其他两种设备有显著差异，且更偏离中立姿势。发现输入设备类型对右肩（p = 0.017）、右肘（p = 0.031）、右手腕/手（p = 0.004）和全身不适（p = 0.026）有显著影响。与其他两种设备相比，触摸屏在上述区域引起更多不适。Friedman检验表明，三次试验中感知到的肩部和肘部姿势的平均评分差异显著（分别为p = 0.005和p = 0.011）。根据受试者的判断，触摸屏是最不利的输入设备。
触摸屏导致更偏离的姿势角度、增加身体不适和不利姿势。
