Rafiee Mahsa, Mokhtarinia Hamid Reza, Parsons Dave, Hosseinpouri Mahdi, Gabel Charles Philip
Department of Ergonomics, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Curtin School of Allied Health, Curtin University, Perth, WA, Australia.
Work. 2023;76(3):1113-1123. doi: 10.3233/WOR-220473.
With progressing technology in the portable computing field, laptops are now integral for work, home and social settings. Different working postures adopted by laptop users impose different loads on the relevant muscles, which can be associated with musculoskeletal discomfort in the various body regions. Some Arabic and Asian cultures adopted postures are not well investigated, particularly for the 20-30 years age-group.
This study compared muscle activity in the cervical spine, arm, and wrist among different laptop workstation setups.
In this cross-sectional study, 23 healthy female university students (age = 24.2±2.28 years, range 20-26 years) performed a standardized 10 minute typing task in four different laptop workstation setups: DESK, SOFA, GROUND sitting with back support, and laptop table (LAP-Tab). Differences between electromyography (EMG) muscle activity recorded in the trapezius (TR), cervical extensors (CE), deltoid (DEL), and wrist extensors (WE) were determined using one-way repeated ANOVA measures with a post-hoc Bonferroni test.
Significantly higher muscle activity was observed respectively in the workstations of DESK > LAP-Tab > SOFA > GROUND. Significant differences were found between WE muscle activity and the three other muscle groups (p < 0.001). There was a significant interaction between workstations and muscle activity (F(9,264) = 3.81, p < 0.001, = 0.11), where the WE and DEL muscles showed respectively higher and lower muscle activity in all setups.
Muscles showed variable activity in different workstations such that the GROUND workstation provided the minimum load, while the DESK workstation showed the maximum load on the measured muscle groups. These findings require further investigation in different cultural and gender specific groups.
随着便携式计算领域技术的不断进步，笔记本电脑如今在工作、家庭和社交场合中不可或缺。笔记本电脑用户采用的不同工作姿势会给相关肌肉带来不同负荷，这可能与身体各部位的肌肉骨骼不适有关。一些阿拉伯和亚洲文化中采用的姿势尚未得到充分研究，尤其是针对20至30岁年龄组。
本研究比较了不同笔记本电脑工作站设置下颈椎、手臂和手腕的肌肉活动情况。
在这项横断面研究中，23名健康的女大学生（年龄 = 24.2±2.28岁，范围20 - 26岁）在四种不同的笔记本电脑工作站设置下进行了10分钟的标准化打字任务：书桌、沙发、有背部支撑的地面坐姿以及笔记本电脑桌（LAP - Tab）。使用单因素重复方差分析测量，并进行事后Bonferroni检验，以确定在斜方肌（TR）、颈椎伸肌（CE）、三角肌（DEL）和腕伸肌（WE）中记录的肌电图（EMG）肌肉活动之间的差异。
在书桌 > LAP - Tab > 沙发 > 地面的工作站中分别观察到显著更高的肌肉活动。腕伸肌肌肉活动与其他三个肌肉组之间存在显著差异（p < 0.001）。工作站和肌肉活动之间存在显著交互作用（F(9,264) = 3.81，p < 0.001，= 0.11），其中在所有设置中，腕伸肌和三角肌分别表现出更高和更低的肌肉活动。
肌肉在不同工作站中表现出不同的活动，使得地面工作站提供的负荷最小，而书桌工作站在所测量的肌肉组上显示出最大负荷。这些发现需要在不同文化和特定性别的群体中进一步研究。
