Kinematics Research On Skills Of 9-18 Years Juvenile's Standing Vertical Jump

Research on the development of juvenile's basic movement skill is very important to the evaluation of the basic skill and the selection of athletes. 333 children age from 9-18 years were selected as the subject. The results which analyze their kinematics parameter of vertical jump through JVC9800 high-speed camera with 100 fps and SIMI-motion video analytical system made in Germany are as follows: 1. Generally, the boys' vertical jump height increase as they are growing, and they develop the height faster in 13-14 and 17-18 period than the rest; girls developed the height faster before 11-12 years old, and then decrease after that. 2.Among some of the body's lower extremity indexes, the length of foot has low correlation with the jump height, but the other indexes, include the arch of padis, the length of calcareous tendon, the length of lower leg, the percent of lower leg, has no direct correlation with vertical jump height . 3.The time of the phases in vertical jump (except the vaulting phase) has no direct correlation with the jump height. 4. When growing up, the angles of children's lower extremity joint become bigger and bigger in the course of taking-off. During the juvenile period, deep-squat jump is better than slight-squat in standing vertical jump. 5. There is a typical of sequential in children's vertical jump, the boys show the sequential of hip, knee, ankle before 13-14years; and with sequential of knee, hip, ankle after that; by contrast, the girls show the sequential of knee, hip,ankle before 13-14years. 6.A11 of subjects have the feature of ankle joint thrust at low speed in standing vertical jump movement.