earticle

영어

The workers under the visual display terminal (VDT) are exposed to the static posture in head, neck, shoulder girdle, trunk, and so on, ultimately resulting to increase the forward neck flexion and to increase static muscle tension in the neck and shoulder regions. The cervical flexion relaxation phenomenon (FRP) is a neck extensor myoelectric silence that occurs during complete cervical and lumbar flexion. The purpose of this study was to investigate the effect of different heights of desk-top’s monitor on flexion relaxation phenomenon in the cervical spine. Eighteen health young adults volunteered to participate in this study. They had no medical history of neurological or surgical problems with their upper extremity. They performed typing task used word-processing program on three different height of desk-top’s monitor (eye level, eye level-15 ㎝, eye level-30 ㎝). During typing task, muscle activation of cervical erector spine was measured by surface electromyography. According to analysis of the results, the flexion-relaxation phenomenon was significantly different among three different height of the monitor. the position at eye level was the highest flexion relaxation phenomenon among three different height of the monitor. Therefore the results of this study suggest that the positioning of monitor’s upper edge at eye level would be necessary for VDT worker.