ヒトの足接地時における人体への衝撃力の評価

概要

論文の詳細を見る
Impact created by the heel striking the floor leads to problems among athletes or patients having artificial joints. The impact force was evaluated using the ellipsoid of impact force and simple models. As the ellipsoid of impact force is derived from a kinematic relation between momentum immediately before and after striking the floor, it is easily applicable to other types of walking such as on steps or slope. The concept of equivalent mass and the center of impact force was also introduced. The mass is determined by the configuration of the leg at heel contact or the heel landing style of a runner. The center of impact force depends on the acting point of the force on the foot and reduces the effect of impact force on the ankle joint. The ellipsoid of impact force suggested the following : the impact force on the distal point of the shank in footless model was remarkably reduced by the assumption of foot ; and some degree of flexion of the knee reduced the impact force and took a minimum value. Experimental results of walking on the floor showed that the transfer of acceleration of impact force to upper elements was greatly attenuated at ankle and knee joints corresponding to normal and fixed ankle walking, respectively. In a running test using shoes with a cushioning material at the heel, the muscle activity of rectus femoris increased as the material hardness increased.
社団法人日本機械学会の論文
1995-10-25