Ergonomic placement of large shared visual display by electromyography

Abstract

This study evaluates the activity of the sternocleidomastoid (SCM) muscle when monitoring information displayed on large shared visual display (LSVD) and recommends proper position for LSVD. Many studies have conducted ergonomic evaluation for single and regular sized monitors by analyzing electromyography (EMG). Ergonomic assessment for LSVD was performed in the study. Eighteen participants gazed static information presented on the wall and EMG activities were recorded from the SCM muscle. Both fixed and swivel chairs were provided for the experiment. EMG was normalized to peak maximum contractile for the muscle (%MVC) and analyzed. Totally twelve positions were selected and examined for LSVD. Borg rating of perceived exertion (RPE) was also measured to assess the subjective psychophysical exertion due to the placement of LSVD. EMG was proportional to the lateral rotation of head regardless of the type of chairs. Swivel chair was somewhat effective to reduce EMG activity of SCM muscle. The intensity of SCM muscle activity would be substantial if LSVD is placed 60° + left and 45° + high with a fixed chair. We recommend frequently monitored LSVD should be located within 45° to the both left and right directions. 30° would be preferred and 45° could be acceptable in the vertical direction for the position of LSVD. © 2016 ICIC International.