Abstract
Forward fall is a major risk for the elderly. In the case of a trip and fall, it is known that the length of the recovery step affects the ability to avoid the fall. However, the effects of recovery step length on the severity of injuries are unclear. Therefore, this study was conducted with the objective of investigating the effects of the recovery step length on the contact velocity with the ground by estimating the natural fall motion using a motion simulator. In this study, we developed a simulator for estimating the fall motion which started from the motion obtained in an experiment. In the experiment, the recovery step of the participants was classified as a short-step case or long-step case. The simulation results showed that the contact velocity had a correlation with the fall velocity of the center of mass (r = 0.52) and the simulation duration (r = -0.50) in the short-step case, but no correlation was observed in the long-step case. It was suggested that a long recovery step could result in an increase in the types of fall motion and thus variations in fall injuries.
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