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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국사회체육학회 한국사회체육학회지 한국사회체육학회지 제42권 제2호
발행연도
2010.11
수록면
1,077 - 1,086 (10page)
DOI
10.51979/KSSLS.2010.11.42.1077

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초록· 키워드

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The purpose of this study is to examine the effects of the contraction strength of the lumbar extensor upon the kinetic variables on the upper limb joints in a scientific analysis. For this study, 4 Taekwondo athletes from B Univ. with advanced skills and a certain number of black belts from Korea Univ selected as the research subjects. The result of the research is as follows: 1. The total elapsed time of the movement was 0.288±0.028 seconds in the non-athlete group, while the athletes group shows a performance of 0.275±0.016 in the elapsed time for a movement. However, the time elapsed for the segmented events of a move did not show any statistically significant differences 2. For each event of a Momtong Jireugi (or a straight body blow), the joints in elbow, hip (coxa joint), and the knee did not show any significant differences except for in the angular displacements. Especially, the displacement at the hip joints showed statistically significant differences in MKA (p<0.05). Such differences appeared to be caused by the wider bending of the coxa joint of the athlete group compared to the non-athlete group, as the take-back of the left arm and torso was made bigger in the preparatory postures. 3. While taking a Momtong Jireugi move, the displacement of the linear movement per each event was analyzed, and the result showed a significant difference. The linear velocity of the right fist at E3 point of the athlete group was 3.17±0.17m/s, which was faster than 5.11±0.19m/s of the non-athlete group. 4. The analysis on the displacement of the linear acceleration in taking a Momtong Jireugi move also revealed a statistically significant difference. The linear accelerations of the right fist`s linear velocity at E3 were, respectively, 86.43±0.17deg/s(2) for the athlete group and 92.57±15.19deg/s(2) for the non-athlete group, making the athlete group significantly faster. 5. The displacements of the angular velocity and angular acceleration per each event during a Momtong Jireugi were also analyzed with a statistically significant result. The linear velocity of the angular acceleration at the right elbow joint was measured as 126.6±26.45deg/s(2), which was a significantly faster angular acceleration than those of other joints. 6. The muscular strength in the lumbar extensor of the athlete group was 149.80±57.61, while the nonathlete group measured 112.44±21.70, showing a statistically significant difference between the two groups (p<.002). Thus, in conducting a Jireugi move, the contraction of the lumbar extensor appeared to have impacts on the kinetic variables of the upper limbs. That is, in order for the Jireugi to gain more speed and accuracy, it is be- lieved that the torso should be fixed with the muscular tensions around the spine. In the following studies, we intend to examine the effects of muscular fortification training for the lumbar extensor upon the speed of the kicks and changes in the extensor.

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