Abstract

In this research, a cycle of hurdling was divided into 4 phases, which were preparation, hurdling, landing and restoring. The objective of the present research was to analyze kinematical variables appearing at the 4 phases of the 4^th hurdling interval in which the runner speeds up by gaining rhythm in the hurdling motions, and to identify the factors that had an effect on correct hurdling motion. The conclusions drawn from the research were as follows. 1. It was judged that the most important factor in maintaining speed was reducing the time to stay in the air during the hurdling phase. Accordingly, it was desirable to keep the parabola of the body center as low as possible to make efficient hurdling motion Out of the duration of a cycle, the ratio of stepping on the ground to staying in the air was 40:60, and the time to stay in the air at the hurdling phase was appeared to be 30% of the duration of the cycle. 2. At the hurdling phase, the peak of the parabola of the body center(PPBC) was 0.31m before the hurdle. While staying in the air, the highest level of the body center was 1.35m, and it was considered that, as a whole, the bending of the upper body at the hurdling phase was not sufficient. 3. At the hurdling phase, the jumping distance (2.07m) appeared to be longer than the landing distance (1.45m). In case of s3, the ratio of the jumping distance to the landing distance was 63:37, which had a longer jumping distance compared to the results of previous researches. In case of s5, the ratio was 54:46 and so the jumping distance was shorter than the former. 4. Throughout the entire cycle, the vertical velocity of the body center increased at the stepping time between the landing and the jumping.

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