Abstract
The purpose of this study was to investigate the kinematic characteristics of the <TEX>$5^{th}$</TEX> and <TEX>$6^{th}$</TEX> hurdle clearances during the final of the 100-m hurdles event at the IAAF World Championships, Daegu 2011. To this end, the hurdling motions of the top 4 ranked female hurdlers in the competition were analyzed. A total of 12 cameras were used to record their motions, with a sampling frequency of 120 Hz. The cameras were calibrated using <TEX>$11{\times}2{\times}1\;m$</TEX> control objects that covered all of the lanes (<TEX>$1^{st}{\sim}8^{th}$</TEX> lanes). After analyzing all the data, we arrived at the following results. For the take-off phase, a negative relationship between the take-off time (CT) and athlete's rank was found. In addition, the average distances from the hurdle to take-off (L1) were shown to be 2.23 m and 2.17 m for the <TEX>$5^{th}$</TEX> and <TEX>$6^{th}$</TEX> hurdles, respectively. For the distance from the hurdle to landing (L2), Pearson (<TEX>$1^{st}$</TEX> rank) and Carruthers(<TEX>$2^{nd}$</TEX> rank) showed inconsistent patterns whereas Harper (<TEX>$3^{rd}$</TEX> rank) and Porter (<TEX>$4^{th}$</TEX> rank) showed consistent patterns. All althetes revealed similar 3 steps patterns between hurdles, which consisted of a shorter <TEX>$1^{st}$</TEX> step, longer <TEX>$2^{nd}$</TEX> step and shorter <TEX>$3^{rd}$</TEX> step.
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