An ergonomics study of thumb movements on smartphone touch screen
An ergonomics study of thumb movements on smartphone touch screen
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智能手机触摸屏上拇指运动的人体工程学研究
作者：
Jinghong Xiong;S. Muraki
本研究调查了在单手姿势的智能手机触摸屏上拇指肌肉活动与拇指操作任务之间的关系。本研究针对右拇指和前臂的六块肌肉，即拇内收肌、拇短屈肌、拇短外展肌（APB）、拇长外展肌、第一背骨间肌（FDI）和指伸肌。性能测量显示，当轻敲较小的按钮（直径为9 mm与3 mm相比）时，拇指会迅速产生疲劳，并且在屈伸方向比内收外展方向运动更慢。同时，FDI在小按钮和屈伸任务中的肌电图和感知用力值显著增加，而APB在内收外展任务中的肌电图和感知用力值显著增加。这项研究表明，在触屏智能手机上，拇指肌肉的动作会因任务的不同而不同，并建议尽量减少使用小的触摸按钮，以获得更好的拇指表现。从业人员总结：通过测量肌电图、拇指表现和感知用力，本研究表明，当拇指轻击小按钮和屈伸方向时，对FDI的需求增加，但在内收外展方向时，对APB的需求增加。使用小按钮的拇指性能下降归因于较小的目标和对FDI需求增加的结合。
This study investigated the relationships between thumb muscle activity and thumb operating tasks on a smartphone touch screen with one-hand posture. Six muscles in the right thumb and forearm were targeted in this study, namely adductor pollicis, flexor pollicis brevis, abductor pollicis brevis (APB), abductor pollicis longus, first dorsal interosseous (FDI) and extensor digitorum. The performance measures showed that the thumb developed fatigue rapidly when tapping on smaller buttons (diameter: 9 mm compared with 3 mm), and moved more slowly in flexion–extension than in adduction–abduction orientation. Meanwhile, the electromyography and perceived exertion values of FDI significantly increased in small button and flexion–extension tasks, while those of APB were greater in the adduction–abduction task. This study reveals that muscle effort among thumb muscles on a touch screen smartphone varies according to the task, and suggests that the use of small touch buttons should be minimised for better thumb performance. Practitioner Summary: Through measurements of electromyography, thumb performance and perceived exertion, this study reveals that demand on FDI increases when the thumb taps small buttons and in flexion–extension orientation, but that demand on APB increases in adduction–abduction orientation. The decreased thumb performance with small buttons is attributed to a combination of smaller targets and increased demand on FDI.