The purpose of this study was toinvestigate motion factors for success and failure trials in female javelin throwers participating at the same competitionfrom abiomechanical standpoint. Successful trials were compared with failure trials for 14 throwers who participated in the Japanese Women`s Javelin Championships Final. The successful trial was set as the best record and the failure trial was the worst record.Analysis timings of throwing motion were at right foot contact (R-on), left foot contact (L-on) and release of javelin (REL). The main results were as follows; 1) There was no significant difference in the approach velocity between the success and failure trials. 2) In the successful trials, peak speedsof the right shoulder, elbow joint and javelin were higher than those of the failure trials. 3) In the successful trials, the left rotation velocity of the shoulder angle was larger than those of failure trials just after L-on. 4) In the successful trials, the forward rotational velocity of the trunk was larger than the failure trials just after L-on. 5) In the successful trials, the throwers maintained a more extended position of the left knee angle than the failure trials between L-on and REL.From these results, it was shown that the causesof superiority or inferiority for female javelin throwers at the same competition occurred not from the approach velocity,but from the blocking motion of the left leg. Although the importance of the block motion of the left leg has been reported many times in previous studies for throwers with different performances, it has become clear that it played an important role in the success of individual performance.
© Copyright 2020 Japan Journal of Physical Education, Health and Sport Sciences. Japan Society of Physical Education, Health and Sport Sciences. Alle Rechte vorbehalten.