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Touch-screen tablet user configurations and case-supported tilt affect head and neck flexion angles

Issue title: Performing Artists, Part 2

Article type: Research Article

Authors: Young, Justin G. | Trudeau, Matthieu | Odell, Dan | Marinelli, Kim | Dennerlein, Jack T.;

Affiliations: Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA | Microsoft Corporation, Richmond, WA, USA | Department of Orthopaedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA

Note: [] Corresponding author: Jack T. Dennerlein, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115, USA. Tel.: +1 617 384 8812; Fax: +1 617 384 8767; E-mail: [email protected]

Keywords: Slate computing, media tablets, mobile computing

DOI: 10.3233/WOR-2012-1337

Journal: Work, vol. 41, no. 1, pp. 81-91, 2012

Received 29 November 2011
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Accepted 29 November 2011
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Published: 2012
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Abstract

Objective: The aim of this study was to determine how head and neck postures vary when using two media tablet (slate) computers in four common user configurations.

Methods: Fifteen experienced media tablet users completed a set of simulated tasks with two media tablets in four typical user configurations. The four configurations were: on the lap and held with the user's hands, on the lap and in a case, on a table and in a case, and on a table and in a case set at a high angle for watching movies. An infra-red LED marker based motion analysis system measured head/neck postures.

Results: Head and neck flexion significantly varied across the four configurations and across the two tablets tested. Head and neck flexion angles during tablet use were greater, in general, than angles previously reported for desktop and notebook computing. Postural differences between tablets were driven by case designs, which provided significantly different tilt angles, while postural differences between configurations were driven by gaze and viewing angles.

Conclusion: Head and neck posture during tablet computing can be improved by placing the tablet higher to avoid low gaze angles (i.e. on a table rather than on the lap) and through the use of a case that provides optimal viewing angles.

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