Influence of virtual keyboard design and usage posture on typing performance and muscle activity during tablet interaction

Ming I.Brandon Lin, Ruei Hong Hong, Yu Ping Huang

研究成果: Article同行評審


This study aimed to determine the effects of virtual keyboard designs and postures on task performance and muscle activity during tablet use. Eighteen healthy adults were randomly assigned to one of three postures (DESK, LAP, BED) to complete six sessions of 60-minute typing on a tablet with three virtual keyboards (STD, WIDE, SPLIT) twice in an experimental laboratory. Keystroke dynamics and muscle activity of the forearm and neck-shoulder regions were measured by electromyography. The split virtual keyboard was found to be associated with faster typing speed (SPLIT vs STD, p =.015; SPLIT vs WIDE, p <.001) and decreased muscle activity of extensor digitorum communis (SPLIT vs STD, p =.021). Lap posture was associated with faster typing speed (p =.018) and higher forearm muscle activity (p <.05). Typing performance decreased (p <.001) with elevated neck extensor muscle activity (p =.042) when the task duration prolonged. The split virtual keyboard showed potential to improve tablet ergonomics under various postures. Practitioner Summary: Tablets have become widely used for a variety of tasks and have gradually expanded into the realm of mobile productivity and education. Adequate designs of virtual keyboards for tablets show the potential for increased task performance and decreased muscle activity pertinent to typing activity and posture constraints imposed by non-traditional work positions. Abbreviations: WPM: words per minute; IKI: inter-key press interval; EMG: electromyography; EDC: extensor digitorum communis; FDS: flexor digitorum superficialis; CES: cervical erector spinae; UT: upper trapezius; EA: electrical activity; MVC: maximum voluntary contraction; APDF: amplitude probability distribution function.

頁(從 - 到)1312-1328
出版狀態Published - 2020 十月 2

All Science Journal Classification (ASJC) codes

  • 人因工程和人體工學
  • 物理治療、運動療法和康復


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