Estimation and improvement of foot pressure measurement system for standing-up motion in elderly

In general, the sit-to-stand movement is common in daily life; however, it is difficult for some elderly people because of weakened muscular strength. Therefore, it is important to provide these patients with feedback regarding their posture and help them stand effortlessly. A motion capture system is one of the best devices to measure posture; however, it is difficult to use in daily life. Consequently, we propose a new measurement system to estimate posture during the sit-to-stand movement using foot pressure, which can be readily used in daily life. In this study, we compared the data obtained using our measurement system with those obtained by motion capture. In addition, we used the inverted pendulum model to reduce the error in the horizontal component of our measurement system.