| Summary: | 碩士 === 國立體育學院 === 教練研究所 === 96 === Gender Diffence on Knee 3D Dynamic and EMG Activity of the Support Leg for Tae-kwon-do Double Jump Roundhouse Kick during Landing
Abstract
Background: According to a study conducted by Chang, Hong, and Tang in 2007, five of the 131 elite tae kwon do practitioners in Taiwan suffered from anterior cruciate ligament (ACL) tear in the support leg within one year. Among the five practitioners suffering from ACL tear, four of them were female, and the four of them all got injured while performing a double jump roundhouse kick. This indicates injuries are more likely to be sustained on ground contact either by performing a double jump roundhouse kick or by female practitioners. As a result, the research carried out by Chang, Hong, and Tang in 2007 suggests that the kinematics and kinetics of the foot-to-ground contact of a double jump roundhouse kick of tae kwon do practitioners are related to the likelihood of ACL tear. However, gender difference was not observed in the study.
Purpose: The purpose of this study is to analyze knee three-dimensional kinematic, kinetic, and EMG activity of the support leg during a double jump roundhouse kick on ground contact, and mainly the difference between male and female athletes.
Method: Sixteen healthy elite tae kwon do practitioners, eight women and eight men between ages of 19 and 22, participated in the study, which focuses on the analysis of knee three-dimensional kinematic, kinetic, and EMG activity of the support leg during a double jump roundhouse kick.
Results and Discussion: This study finds that there were no significant differences of the three-dimensional joint moment and the CI of six muscles during landing between male and female athletes. However, as far as kinematics is concerned, the study finds that on ground contact, a female has a greater Q angle, a smaller angle of knee joint, and a significantly lower activation level of the vastus medialis, biceps femoris, and semitendinosus muscle than a male. This indicates that female athletes have a greater susceptibility to knee injuries due to improper technique, including knock knees, stiff landing, unstable knee joint, and an inadequate activation level of the muscle to increase the support of the lower body.
Conclusions: Female tae kwon do practitioners have a greater susceptibility to injuries of the ACL due to foot-to-ground contact technique after performing a double jump roundhouse kick.
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