Pei Huining, Yu Suihuai, Babski-Reeves Kari, Chu Jianjie, Qu Min, Tian Baozhen, Li Wenhua
Northwestern Polytechnical University, Xi'an, China (Shaanxi Engineering Laboratory for Industrial Design).
Mississippi State University, Mississippi, USA (Department of Industrial and Systems Engineering).
Med Pr. 2017 May 16;68(3):315-327. doi: 10.13075/mp.5893.00613. Epub 2017 Apr 26.
Sit-stand workstations are available for office work purposes but there is a dearth of quantitative evidence to state benefits for lower limb outcomes while using them. And there are no guidelines on what constitutes appropriate sit/stand time duration. The primary aim of this study has been to compare muscle activity and perceived discomfort in the lower extremity during various combinations of sit/stand time duration associated with a sit-stand workstation separately and to evaluate the effects of the sit-stand workstation on the lower extremity during the text entry task.
During the 5 days, all participants completed a 2-h text entry task each day for various sit/stand time duration combinations as follows: 5/25 min, 10/20 min, 15/15 min, 20/10 min, 25/5 min. Lower extremity muscular exposure of 12 male and 13 female participants was collected at 8 sites by surface electromyography and body discomfort was calculated by a questionnaire under those 5 conditions.
Results have demonstrated that lower extremity muscle activity has been significantly varied among the 5 sit/stand time duration groups. Perceived level of discomfort (PLD) has not differed significantly for 9 out of 10 body parts.
The muscle activity of the thigh region was influenced by sit/stand time duration significantly. Ergonomic exposures of lower extremity when using a sit-stand workstation were increased, particularly during the long time standing posture. Results indicate that body mass index (BMI) and gender were not significant factors in this study. Combination of sit/stand time duration 25/5 min appears to show positive effects on relief of muscle exposure of back of thigh in the shifts of sitting and standing work position. Med Pr 2017;68(3):315-327.
坐站两用工作站可用于办公，但缺乏定量证据说明使用此类工作站对下肢健康有益。而且，对于合适的坐/站时长，尚无相关指南。本研究的主要目的是分别比较与坐站两用工作站相关的不同坐/站时长组合下下肢的肌肉活动和感知不适情况，并评估坐站两用工作站在文本输入任务期间对下肢的影响。
在5天时间里，所有参与者每天针对不同的坐/站时长组合完成2小时的文本输入任务，具体如下：5/25分钟、10/20分钟、15/15分钟、20/10分钟、25/5分钟。通过表面肌电图在12名男性和13名女性参与者的8个部位收集下肢肌肉暴露数据，并在这5种条件下通过问卷计算身体不适程度。
结果表明，在5个坐/站时长组中，下肢肌肉活动有显著差异。10个身体部位中有9个部位的感知不适水平（PLD）没有显著差异。
大腿区域的肌肉活动受坐/站时长的影响显著。使用坐站两用工作站时，下肢的人体工程学暴露增加，尤其是在长时间站立姿势期间。结果表明，体重指数（BMI）和性别在本研究中不是显著因素。坐/站时长组合为25/5分钟似乎对缓解坐站工作姿势转换时大腿后部的肌肉暴露有积极作用。《医学实践》2017年；68(3):315 - 327。
