1964年-1985年における平均台技術 (自由演技) の変遷

The purpose of this study was to clarify the change of skills in balance beam from 1964 to 1985. The skills were surveied with using 8mm films or video tapes which were took pictures in Olympic Games or International Gymnastic Meets. The results were summarized as follows : 1) Composition of performance could be easily understood with symbols of skills. 2) The rules in balance beam had been changed with development of skills. 3) Compositions of performance were different from each gymnasts. 4) Backward somersault has been performed by many gymnasts in balance beam. 5) In the latest balance beam, acrobatic performances were frequently observed. 6) In gymnastic performances, lower difficulty level of skills were mainly composed. On the other hand, higher levels of skills were mainly observed in acrobatic performances