柔道における頭部外傷を防止するための保護具の検討

抄録

Judo has been compulsory at junior high school in Japan since 2012. However, judo has a higher mortality rate than other sports, and countermeasures are urgently required. The main cause of death accidents in judo is acute subdural hematoma (ASDH). ASDH is caused by the brain moving in the cranium due to a strong impact on the head and rupture of the bridging vein connecting the brain and skull. The purpose of this study is to examine the head protection material which can suppress the relative displacement at the time of head collision based on the relation between the strain of the bridging vein and the relative displacement of the brain and skull. As a result of optimizing the cranial deceleration curve, relative displacement decreased by about 20 %. And in the experiment using the head model, the deceleration curve and the relative displacement in the combination of buffer materials were measured. The results showed that the relative displacement was minimized in the combination of buffer materials that was closest to the deceleration curve obtained by optimization. Therefore, the result obtained by optimization is considered to be reasonable, and the optimal combination of buffer materials is low repulsion urethane 10 mm and cardboard with honeycomb structure 20 mm.