Abstract
In this paper we will discuss methods of helping to prevent judo accidents.
As one step, we have made the mat floor reasonably flexible, by placings under the mats of the judo hall, so that the shock to the human body can be lessened and ukemi can be easily accomplished, when a man is thrown down.
We have measured the differences of the shocks to the human body, according to three kinds of ukemi-ushiro-ukemi, yoko-ukemi and mae-mawari-ukemi.
Also we have evaluated the strength of shocks on the hips when a man is thrown by seoinage, haraigoshi, and okuriashibarai on the spring-placed judo hall.
