Influence of smartphone use styles on typing performance and biomechanical exposure

Ergonomics
Ping-Hsin KoHuey-Wen Liang

Abstract

Twenty-seven subjects completed 2-min typing tasks using four typing styles: right-hand holding/typing (S-thumb) and two-hand typing at three heights (B-low, B-mid and B-high). The styles had significant effects on typing performance, neck and elbow flexion and muscle activities of the right trapezius and several muscles of the right upper limb (p < 0.0001 by repeated-measure analysis of variance). The subjects typed the fewest words (error-adjusted characters per minute: 78) with the S-thumb style. S-thumb style resulted in similar flexion angles of the neck, elbow and wrist, but significantly increased muscle activities in all tested muscles compared with the B-mid style. Holding the phone high or low reduced the flexion angles of the neck and right elbow compared with the B-mid style, but the former styles increased the muscle activity of the right trapezius. Right-hand holding/typing was not a preferable posture due to high muscle activities and slow typing speed. Practitioner Summary: Right-hand holding/typing was not favoured, due to increased muscle activities and slower typing speed. Holding the phone high or low reduced the flexion angles of the neck and right elbow, but the former styles increased the muscle activity ...Continue Reading

Associated Clinical Trials

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Citations

Jan 25, 2019·Telemedicine Journal and E-health : the Official Journal of the American Telemedicine Association·Glaukus Regiani BuenoTiago Franklin Rodrigues Lucena
Apr 5, 2019·Applied Bionics and Biomechanics·Jun ZhangZhijie Zhang
Oct 28, 2020·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Nazi DerakhshanradHooshang Saberi
Oct 27, 2020·Work : a Journal of Prevention, Assessment, and Rehabilitation·Zahra VahediEhsan Garosi
Aug 3, 2021·Journal of Back and Musculoskeletal Rehabilitation·Sun-Hee AhnOh-Yun Kwon

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