Abstract
Human posture is characterized by upright standing. Standing erect is one of the most popular and basic working posture. It is important the postural regulation system is analyzed. Stabilograms (Sbg), which reflects the displacement of foot pressure in a standing posture, has been analyzed using time series analysis methods. It is regarded as the realizations of linear stochastic processes. This paper describes experiments with healthy 10 males and 12 females subjects, holding and backing 5 kinds (0, 3, 6, 9, 12kg) of weight loads, stand on a force platform. Sbg is recorded 2 minutes for each load. The enclosed area, total length and the numbre of turning points of the displacement of the center of foot pressure are calculated from the Sbg. There was tendency for the area, the velocity and the length of displacement of center of foot pressure to increase with the weight of the load. But the number of turning points was in inverse proportion to the weight of loads. It was found that some parameters calculating from Sbg could evaluate control mechanism in standing posture.
