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A Driving Model of the Trunk and the Attack Leg for the Jump-back Kick in Taekwondo
This study investigated the relationship between trunk twist and joint flextion/extension of the attack leg and looked for an optimum driving model in jump-back kick. Six male taewondo athletes (age: 21.2�2.3 years old; height: 180.8�4.7 cm; weight: 80.7�11.6 kg) were selected as subjects. Two Redlake high-speed cameras (60Hz) were used to collect the jump-back kick movement. The Kwon 3D software was used to analyze the jump-back kick movements. The result showed that the upper trunk or the lower trunk had a counter-movement in the attack phase. When the attack leg hit a bag, the hip and knee joints were in continuous extension. The upper trunk would drive the lower trunk to rotate after jump takeoff. The upper trunk or the lower trunk had a counter-movement in the attack phase in order to maintain the body balance. In the attack phase, the hip and keen joints were in continuous extension. The peak angular velocity of the hip joint appeared earlier than that of the knee joint, which helped extend the keen joint to effectively attack the target. Through the analysis of the trunk twist and the joint extension of the attack leg, a better model after jump takeoff can be found. To drive from the upper trunk through the lower trunk, and from the hip to the knee, is the optimum driving model for the jump-back kick as found in this study.
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