Abstract
In the present study, 2 kinds of experiments were conducted to investigate differences in micro movement of the body between wood classroom chair and OA chair (experiment 1) and between conventional desk work and VDT task (experiment 2). In the experiment 1, VDT task was performed by 8 subjects. A chair used in the experiment 2 was the VDT chair, and 5 subjects participated in the experiment 2. A method for continuously measuring the angle of pelvic inclination was developed to record the micro movements.
In the experiment 1, the micro movement was observed more frequently under the condition of the classroom chair than under the condition of the OA chair. The results suggest that the postural changes occurred frequently during the experiments using the classroom chair. In the experiment 2, the conventional desk work accompanied many micro movements, while during VDT task the frequency of the micro movement was low. These results show that VDT work forces users to a constant constrained posture and VDT work is easy to bring muscular fatigue.
