Abstract
In recent years, aging has been deteriorating rapidly. And people concerned about how to prevent bedridden gradually. One of big cause of the bedridden is the injury by fall in walk, so we wanted to detect a timing of the fall for preventing that injury. For considering the movement of walk and fell, we measured a position of knee, waist and center of die gravity by using a position sensor and a force plate. From the result of experiment of walking, we found that the direction-of-movement speed of a knee became 0m/s when people stumbled. And we also found that a vertical direction speed of a knee became larger than that in a walk.
