Data underlying the publication "Comfort and Discomfort in a Chair Using the Smartphone".

This paper presents the results of an experiment studying the effect of using an arm support on smartphone use. Twenty-four participants tested a chair with a special arm support for smartphone use. The participants were asked by questionnaire to describe their perception of their comfort and discomfort after they used the chair with and without the armrest for 15 minutes. The effects on posture and productivity were tested. Productivity was tested by counting the number of typed characters and spelling mistakes. There was a nonsignificant trend that the word count of users in the smartphone chair without the armrest was higher than with armrest and the spelling mistakes of users in the chair without armrests were lower than in the seat with armrests (p< 0.05). Comfort and discomfort were evaluated using a questionnaire. The discomfort and comfort differed for the total body, neck, upper back, lower back, lower arm, wrist and leg, but not significantly. Only the upper arm in the condition with arm support showed a higher discomfort and a lower comfort level (p< 0.05). The posture of the participants was analysed using Kinovea software for the body angles and were processed further using a RULA assessment. The results show that the potential ergonomic risk when people used the smartphone in the chair without arm support is lower than when they used the chair with the armrest (p< 0.05). In conclusion, the armrest increased discomfort of the upper arm of participants, probably because it limits freedom of movement or because the height of the armrest is not adjustable.

本研究报告了一项实验的结果，该实验探究了手臂支撑装置在智能手机使用场景中的应用效果。24名受试者参与测试了一款专为智能手机使用设计的带特殊手臂支撑装置的座椅。受试者需填写问卷，描述其分别使用带扶手与无扶手的该座椅进行15分钟智能手机使用后的舒适度与不适感感知。本研究同时测试了该装置对使用者姿势与工作效率的影响：工作效率通过统计输入字符数与拼写错误数来评估。结果呈现出一项不显著的趋势：未安装扶手的座椅使用者的输入字符数高于安装扶手的情况，而无扶手座椅使用者的拼写错误率低于带扶手座椅（p<0.05）。舒适度与不适感通过问卷进行评估，受试者在全身、颈部、上背部、下背部、前臂、手腕与腿部的舒适度与不适感评分存在差异，但该差异不具有统计学显著性。仅在搭载手臂支撑装置的场景中，受试者上臂的不适感显著更高、舒适度显著更低（p<0.05）。受试者的姿势通过Kinovea软件进行身体角度分析，并进一步采用快速上肢姿态评估（Rapid Upper Limb Assessment，RULA）方法进行处理。研究结果表明，使用者在无扶手座椅上进行智能手机使用时的人机工程学潜在风险低于带扶手座椅的情况（p<0.05）。综上，扶手会加剧受试者上臂的不适感，这可能是由于其限制了手臂活动自由度，或是扶手高度不可调节所致。