テニスのグランドストローク時におけるフットワークの基礎的研究

概要

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The present study examined changes in running speed, step length, step frequency and step width to clarify the mechanism of footwork for running quickly during tennis ground-stroke. The subjects were 17 male professional tennis players who participated in the AIG Japan Open Tennis 2006 in Tokyo, Japan. The movements of tennis players were recorded using video camera during tennis ground-stroke. The X-Y coordinates of player's toes in foot contact were calculated by the two-dimensional direct linear transformation method. Tennis players reached the hitting point using almost two steps when chasing the tennis ball quickly from the center mark of the tennis court. The running speeds in the 2nd step were faster than those in the 1st step. There was a significant positive correlation between the step length and running speed in the 2nd step (r = 0.508, p < 0.05) while no significant correlation was observed between the step frequency and running speed in the 2nd step. The step length and running speed in the 2nd step showed significant positive correlations with the step width in the 1st step (r = 0.516, p < 0.05 ; r = 0.561, p < 0.05, respectively). In conclusion, the increase of running speed in the 2nd step is the result of step length increase rather than step frequency in the 2nd step, and it is suggested that the step width in the 1st step contributed to the increase of step length in the 2nd step.