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The purpose of this study was to investigate the effects of lumbar rehabilitation exercise based on scientific and effective training programs, and to contribute improvement of athletic competence for Taekwondo players. The subjects of the present study were five high school Taekwondo players(flat back group: M = 1, F = 1) who felt a lumbar pain. According to each posture, the subjects were performed lumbar rehabilitation training for eight week, and the effects of lumbar rehabilitation training analyzed lumbar extension strength, and change of lumbar pain were as follows: 1. The lumbar extension strength of All subjects increased during period of eight week rehabilitation training, especially the female flat back subjects found a high rate of improvement. The male flat back subject found the continuous rate of increase, on the other hand the male subject found a high rate of improvement at the early stage of training. In general.
after rehabilitation training lumbar extension strength of whole subjects was increased at the level of p<.05. 2. After rehabilitation training the lumbar posture of whole subjects was returned to normal condition at the level of p<.01.