Human-Computer Interaction: Ergonomics and User Interfaces - Vol. 1

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview

Can a more neutral position and support of the
forearms at the table top reduce pain for VDU
operators. Laboratory and field studies.

Arne Aarås1, Ola Rol2 and Gunnar Horgen3 1. Alcatel STK A/S, P.O.Box 60 ∅kern, N-0508 Oslo, Norway, 2. Premed. P.O.Box 275, ∅kern, N-0511 Oslo, Norway. 3. Buskerud College, Department of Optometry, P.O. Box 235, N-3601 Kongsberg, Norway.


1
INTRODUCTION

In order to evaluate the health effects of both supporting the forearms and keep it in a more neutral position when doing VDU (Visual Display Unit) work, laboratory and field studies were carried out.


2
LABORATORY STUDIES

2.1
Materials and Methods

A laboratory study with 20 experienced VDU workers was performed. The aim of the study was to compare the postural load during data entry work when sitting with and without possibility, to support the forearms on the table top by using electromyography (EMG). Figure 1. The upper static trapezius load when using keyboard was significantly less when sitting with supported forearms on the table top (0.8 % MVC (Maximum Voluntary Contraction)) compared with sitting (3.6 % MVC) without support, as group mean values respectively. The static load when using mouse was significantly less with the forearm supported, (0.1 % WC vs. 1.2 % MVC) without support, as group mean values ( Aarås et al 1997).

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