素早いジャンプ動作の研究

―滞空時間・荷重値・筋力―

抄録

The purpose of this study was to clarify the characteristic of quick Hiza-nuki J (knee relaxing jump) in detail on the movement time, comparing the jump duration of Hiza-nuki J with that of a counter movement jump (CMJ). In addition, it examined the maximum vertical ground force per weight and the relationships with the extension muscular strength of three lower limb joints at every movement phase of the jump. Results are summarized as follows: 1. The jump duration of two jumps of CMJ and Hiza-nuki J did not have the significant difference, but had a correlation (r ＝ 0.844, p ＜ 0.05 s), 2. As for the maximum vertical ground force per weight of CMJ and Hiza-nuki J, Hiza-nuki J was significantly larger (p ＜ 0.05). Further, both had a meaningful correlation (r ＝ 0.611, p ＜ 0.05), 3. Between the maximum vertical ground force per weight and jump duration of CMJ and also between those of Hiza-nuki J, there was no meaningful correlation. 4. There was no correlation between time at every movement phase of Hiza-nuki J and jump duration, 5. In movement times of CMJ and Hiza-nuki Jump from the beginning to leaving floor, and time of PPT and PPTB, there was a meaningful correlation for relationships with the maximum vertical ground force per weight, 6. For between jump duration and the lower limb extension muscular strength of CMJ, there was a meaningful correlation between muscular strength of the knee joint extension of 300 degrees/second (r ＝ 0.632, p ＜ 0.05) and the foot joint extension of 60 degrees/second (r ＝ 0.634, p ＜ 0.05). Also, there was a meaningful correlation between jump duration and knee joint extension of 300 degrees/second in Hiza-nuki J (r ＝ 0.654, p ＜ 0.05), and 7. In the relationships of time in the movement phase of CMJ and Hiza-nuki J and lower limb extension muscular strength, there was a meaningful correlation only between PT of Hiza-nuki J and muscular strength of the foot joint extension 60 degrees/second (r ＝ 0.619, p ＜ 0.05). Hiza-nuki J was the jump method that secured the jumping height at the same level as CMJ by the movement time when Hiza-nuki J was quick, and possible usability was suggested to be more effective than by ball game sports.