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정규 저크(Normalized Jerk)를 이용한 태권도 돌려차기 동작 분석
조임형(Lim Hyeong Cho),강성철(Seong Chul Kang),강신배(Sin Bae Kang),박석(Sok Park),김태완(Tae Wan Kim),고석곤(Suk Gon Go),권문석(Moon Seok Kwon) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.49
The purpose of this study was to evaluate the round-house kick of Teakwondo and to compare between elite and novice Teakwondo players using the normalized jerk method. MATLAB v6.5(Mathworks Inc., USA) was employed to analyze the normalized jerk. Fourteen male subjects who had no musculo-skeletal diseases were participated and were classified into two groups(7 elite and 7 non-elite Teakwondo players). While all subjects performed the round-house kick, the height of target set up based on the center of trunk position, respectively. In this study, independent t-test (elite and non-elite) was applied to obtain the differences of normalized jerk value between the two groups. Significance level was set as p=.05. The forward backward and upward downward normalized jerk values of the kicking foot COM(center of mass) were found to be significantly different between elite and non-elite groups in the maximum knee flexion phase. Significant difference was seen in the upward downward normalized jerk value of the kicking foot COM from maximum knee flexion to impact between elite and non-elite groups(p<.05). The forward backward and upward downward normalized jerk values of the kicking foot COM were found to be significantly different between elite and non-elite groups during overall round-house kicking phase(p<.05). The left-side right-side and upward downward normalized jerk values of the whole body COM(center of mass) were found to be significantly different between elite and nonelite groups in the maximum knee flexion phase(p<.05). Significant difference was seen in the left-side right-side normalized jerk value of the kicking whole body COM from maximum knee flexion to impact between elite and non-elite groups(p<.05). The normalized jerk values of upward downward were found to be significantly different between elite and non-elite groups during overall round-house kicking phase(p<.05).
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