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Kinematic Analysis of Skiing with Different 2 Type of Ski Simulator
Lee, Hyo-Taek(이효택),Roh, Hyo-Lyun(노효련),Heo, Bo-Seob(허보섭),Kim, Yong-Jae(김용재) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.58
본 연구는 두 가지 시뮬레이터에서 스키 동작 시 스키어의 하지 관절각 변화와 근활성도에 어떠한 영향을 미치는지 분석하고, 이를 토대로 시뮬레이터에서 보다 안전하고 정확하게 자세를 유지하며, 관절의 가동범위와 주동근을 효율적으로 활용할 수 있도록 도움이 되고자 하였다. 연구대상자는 대한스키지도자협회 지도자 자격을 소지하고 있는 남성 8명으로 선정하였다. 각 구간별 스키 동작의 소요시간, 하지관절각의 변화, 근활성도를 산출한 결과를 다음과 같다. 첫째, 프로시뮬레이터에서의 스키 동작 시 스키어스에지에 비해 오랜 시간 스키 동작을 수행하였으며 통계적으로도 유의한 차를 나타냈다. 둘째, 하지 관절각을 살펴보면, 최초 준비자세 E1, 좌측 최대구간 E2 그리고 우측 최대구간 E4에서 유의한 차를 보였으며, 스키어스에지 보다 프로시뮬레이터에서 더 큰 변화폭을 보였다. 셋째, 하지 근활성도의 경우 프로시뮬레이터에서 대퇴직근(p< .001), 대퇴이두근(p< .001), 전경골근(p<.05), 및 비복근(p< .001)로 %MVIC 값이 높게 나타났다. 대다수의 피험자들이 프로시뮬레이터에서의 스키 동작시 더 큰 %MVIC 값을 유지하며 동작을 반복한 것으로 나타났다. 스키시뮬레이터에서의 스키 동작을 효율적으로 수행하기 위해서는 양발의 스키 수행시간을 최대한 활용하면서, 고관절과 무릎관절을 최대한 굴곡 시킨 후 빠르게 신전시키는 능력이 요구된다. 하지만 스키기술 수준에 따라 개별성의 차이가 있으므로, 본 연구결과에서는 숙련자의 경우 프로시뮬레이터, 비숙련자의 경우 스키어스에지의 운동 수행이 보다 안정적으로 이뤄질 수 있다고 판단되며, 향후 본 연구와 관련하여 부상 예방을 위한 근력 트레이닝 프로그램 및 보다 안전하고 효율적인 동작을 가져갈 수 있기 위한 부가적인 조절장치의 개발도 필요할 것으로 사료된다.
이효택(Lee, Hyo-Taek),김용재(Kim, Yong-Jae) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.58
In this study, the researcher tried to analyse the sculling motion for prevent water safety accident, and suggest the most efficient sculling method through 3-dimensional motion analysis. An experiment was conducted on the study subjects of 7males with life guard licences issued by the Korean Red Cross, living in B district with their spontaneous consent after explaining the purpose and method of this study sufficiently. The effects of various angles in sculling on 3-dimensional motion analysis areas follows; It took 1.61 sec to perform the sculling, and the variation of angle of the elbow showed 22.86° in the left and 15.48° in the right in P1 section, while 21.95° in the left and 21.77° in the right in P2 section. On the other hand, the variation of angle of the shoulder showed 13.93° in the left and 12.82° in the right in1 P section, while 16.05° in the left and 12.46° in the right in P2 section. Though sculling movements were analyzed by collecting anthropometric data through 3-dimensional motion analysis, it is a little limited that we generalize the result drawn from the laboratory experiment as an actual under water sculling value, which warrants further studies on the measuring of over all swimming movement of rotary kick of our lower body as well as sculling, along with various subjects.
허보섭(Heo, Bo-Seob),이효택(Lee, Hyo-Taek),김용재(Kim, Yong-Jae) 한국사회체육학회 2015 한국사회체육학회지 Vol.0 No.61
This paper is to establish the kinetic and kinematic factors of Apkkoaseogi(front cross stance) Yeopchagi(side kick) in Taekwondo through factors such as movement of the center of the whole body, the angle of the kicking foot, the supporting foot in the lower body, and the muscle activity and then describe the improvement in the skill for the Taekwondo Poomsae players. The study was performed targeting 6 awarded players who had the experience of winning at the national team competition and other nationwide competitions and 6 players who had no experiences at those competitions. After explaining to them the purpose and procedure of the test and getting the written consents from them, the test was conducted. For the test, 5 high speed digital cameras(Motion Master 100) and wireless EMG(QEMG-4, Lxtha Korea) were used to collect the data on 5 practices of Apkkoaseogi(front cross stance) Yeopchagi(side kick) in Taekwondo focusing on the movement of the center of the body, the angle of the hip joint, knee joint and the ankle joint, and the muscle activity of the femoral rectus muscle, biceps femoris, gastrocnemius muscle and tibialis anterior. Among them, 1 action which was judged to be the most perfect was chosen for analysis. By removing the first and last 2 seconds in the signal of surface electromyography stet, the root mean square(RMS) and the % MVIC value were obtained for analysis. For the processing of the data, SPSS 21.0 software was used and the analyzed values were obtained including the average(M) and standard deviation(SD). For the identification of the difference between the awarded players and the non-awarded players, the independent sample t-test was conducted and the significant statistical level was set as(p< .05). The results were as follows. 1. Duration of Apkkoaseogi Yeopchagi in Taekwondo The duration of Apkkoaseogi Yeopchagi in Taekwondo at each phase showed a significant difference at the phase of P4(p< .05). 2. The Movement of the center of the body at Apkkoaseogi Yeopchagi in Taekwondo 1) As for the change in the movement of the center of the body of the longitudinal axis(Y axis), there were statistically significant differences in E1 Phase(p< .01), E2 Phase(p< .01), E3 Phase(p< .01), E4 Phase(p<.01), E5 Phase(p< .05) and E6 Phase(p<. 05). 2) There were also statistically significant differences in the change in the movement of the center of the body of the vertical axis(Z axis) at the stages of E2 Phase(p< .05), E3 Phase(p< .05), and E4 Phase(p< .01). 3. Angle of lower body in the action of Apkkoaseogi Yeopchagi in Taekwondo 1) There were statistically significant differences in the right hip joint in E2 Phase(p< .01), E3 Phase(p< .01), and E6 Phase(p<. 01). There was a statistically significant difference in the left hip joint at the Phase E4(p<.01). 2) There was a statistically significant difference at the right knee joint in E6 Phase(p< .01) while there was a statistically significant difference(p< .05) at the left knee joint in Phases E2 and E6. 3) There was also a statistically significant difference at the right ankle joint in the phase E4(p< .05). 4. Muscle activity in the lower body at Apkkoaseogi Yeopchagi in Taekwondo 1) There were big muscle activities in the left and right side of the femoral rectus muscle and the statistically significant difference between them. 2) There were big muscle activities in the right side of the biceps femoris and the statistically significant difference. 3) There were big muscle activities in the right side of the gastrocnemius muscle and the statistically significant difference. In conclusion, the Apkkoaseogi(front cross stance) Yeopchagi(side kick) in Taekwondo needs a stable movement of the upper body and a stable posture of the kicking foot as well as the balance of the supporting foot. For a strong, fast Yeopchagi of 170°, there is a need for a strong power of repulsive power