Kietrys David M, Gerg Michael J, Dropkin Jonathan, Gold Judith E
School of Health Related Professions, Rutgers, The State University of New Jersey, 40 E. Laurel Road, Stratford, NJ, USA.
Occupational Therapy Assistant Program, Harcum College, 750 Montgomery Ave., Bryn Mawr, PA, USA; Department of Rehabilitation Sciences, Temple University, 3307 N. Broad St., Philadelphia, PA 19140, USA.
Appl Ergon. 2015 Sep;50:98-104. doi: 10.1016/j.apergo.2015.03.003. Epub 2015 Mar 25.
This study aimed to determine the effects of input device type, texting style, and screen size on upper extremity and trapezius muscle activity and cervical posture during a short texting task in college students. Users of a physical keypad produced greater thumb, finger flexor, and wrist extensor muscle activity than when texting with a touch screen device of similar dimensions. Texting on either device produced greater wrist extensor muscle activity when texting with 1 hand/thumb compared with both hands/thumbs. As touch screen size increased, more participants held the device on their lap, and chose to use both thumbs less. There was also a trend for greater finger flexor, wrist extensor, and trapezius muscle activity as touch screen size increased, and for greater cervical flexion, although mean differences for cervical flexion were small. Future research can help inform whether the ergonomic stressors observed during texting are associated with musculoskeletal disorder risk.
本研究旨在确定在大学生进行的短时间短信任务中，输入设备类型、短信编辑方式和屏幕尺寸对上肢及斜方肌活动以及颈椎姿势的影响。与使用尺寸相似的触摸屏设备进行短信编辑时相比，使用物理键盘的用户拇指、手指屈肌和腕伸肌的活动更强。与使用双手/双拇指进行短信编辑相比，使用单手/拇指在任何一种设备上进行短信编辑时，腕伸肌的活动都更强。随着触摸屏尺寸的增加，更多参与者将设备放在腿上，且选择较少使用双拇指。随着触摸屏尺寸的增加，手指屈肌、腕伸肌和斜方肌的活动也有增强的趋势，颈椎前屈也有增加的趋势，尽管颈椎前屈的平均差异较小。未来的研究有助于明确在短信编辑过程中观察到的人体工程学压力源是否与肌肉骨骼疾病风险相关。
