Although the achievements of Chinese female long jumpers are in the top position in Asia, there is great difference compared with world-class jumpers, especially greater differences exist among reserve athletes. The main cause of this gap may be the technique of long jump. This study selected 15 female elite reserve long jumpers (achieved from 6.5m to 6.7m) as the subjects, and a high-speed camera was used to measure their kinetic characteristics during last two strides of the run-up and during take-off. The jumpers' horizontal velocity of the centre of the gravity (C.G.) decreased greatly (-1.157 m.s-1) during the last two strides of the run-up, and significant difference was found compared with the world class jumpers (p<0.01). Their vertical velocity of CG was smaller than the world-class jumpers during take-off phase (p<0.01). The height of CG was lower than the world-class jumpers (p<0.01). The maximal knee joint angle during take-off was 137.22° and smaller than world-class jumpers. Although the maximal velocity on the Chinese female jumpers is nearly the same as the world-class jumpers, the horizontal velocity of CG from the last strides during run-up to take-off showed greater decrease and the initial velocity showed significant decrease too. Therefore, in order to catch up with world-class level of this event, we must develop the take-off technique of the reserve jumpers.
© Copyright 1999 5th IOC World Congress on Sport Sciences with the Annual Conference of Science and Medicine in Sport 1999. Alle Rechte vorbehalten.