The purpose of this study was to investigate the factors that caused poor records of female discus throwers by comparing their success and failure trials in the same competition. Seven female discus throwers were recorded with two video cameras in competition and their trials were analysed by a three-dimensional DLT method. The increase in discus speed from L-ON (the left foot grounded) to REL (discus was released) was smaller in failure trials than in success trials. The horizontal rotation of shoulders and hips from L-ON to REL was smaller in failure trials than in success trials. The upper limb moved towards throwing direction earlier in failure trials than in success trials. The decrease in twist angle of trunk at L-ON is considered to relate poor records in female discus throwers.
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