Crew members' fatigue has been reported as the one of the causes of marine accident. It is necessary for inventing the decreasing method of the fatigue to clarify its causes. In our previous study, it was reported that crew members' standing postural motion against ship motion was probably the one of the causes of physical fatigue. However effects of visual stimuli on standing postural motion were still unclear. The purpose of this study is to investigate effects of the projected images of a ship handling simulator on trainees' standing postural motion. Standing postural motion was evaluated by measuring linear and angular accelerations at the head and waist, exercise load, and motion of the center of gravity (COG). Six participants looked at three kinds of image (1: image without wave, 2: 3 m height wave and 12 s wave periods, 3: 3 m height wave and 8 s wave periods). Mean values of total length of COG at image condition 2 and 3 increased compared with the length at the image condition 1. When the image condition was 3, mean value of the median frequency of horizontal direction was higher than the frequency of image condition 1. We thus found possibility that the projected images cause the standing postural motions of trainees.
