| （School of Physical Education，Ludong University，Yantai 264025，China） Abstract: By means of video shooting and synchronous 3D force measurement, the authors studied the characteris-tics of the change of kinetic information regarding continuous vertical jumping in situ, and revealed the following findings: the instant force at the end of buffering, peak jumping force, average jumping power and impulse gradu-ally diminished with the elapse of the time of continuously vertical jumping in situ (P<0.05); during continuous vertical jumping in situ at difference frequencies, the instant force at the end of buffering and peak jumping force have a different effect on the initial jumping effect; measured at the frequency of 60 times/min, the instant force at the end of buffering and peak jumping force are significantly greater than the same measured at the frequencies of 40 times/min and 50 times/min, yet the initial jumping effect is worse than the same measured at the frequencies of 40 times/min and 50 times/min; the recovery coefficient at the early stage of continuous vertical jumping in situ at the three frequencies are all greater than 1.
Key words: human body kinetics；vertical jumping in situ；volleyball player |
