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Biomechanical Analysis of TAEKWONDO ‘Geodeup Yeopchagi’ Kick
Heo Bo-seob,Lee Hyo-taek,Lee Jeong-ki J-INSTITUTE 2019 International Journal of Martial Arts Vol.4 No.2
The purpose of this study was to analyze the movements of the lower extremity joints during a taekwondo kick motion called Geodeup Yeopchagi , which was administered to players to improve their balance, stability, and range of motion for the prevention of injuries. The subjects of this study were eight selected skilled practitioners and eight unskilled athletes who had won the national competition from the Poomsae athletes who have been registered with the Korea Taekwondo Association for more than three years. Before entering the experiment, each subject was asked for consent and explained how to proceed with the experiment. Kinematic data were collected by four real-time infrared cameras. The hip joint, knee joint, and ankle joint angles were measured using instruments. Data processing: The statistical process of this study calculated the mean and standard deviation(M ± SD) using Excel 2018, and the statistical program(SPSS 22.0, SPSS Inc., Chicago, IL, USA). The Shapiro-Wilk test was conducted to verify the normality of the collected data. Independent t-test was performed to analyze the effects on the kinematic variables according to the kicks of Taekwondo Poomsae athletes and amateur. test and assay(Mann-Whitney U test) were performed and the significance level of all statistics was set to α = .05. During the Geodeup Yeopchagi kick motion, there were small and inconsistent effects on each joint. The results showed that the characteristics of the poomsae are to balance the feet when hitting the side kick close to170 degrees quickly and to maintain the CoM close to the base and to support the side kick in order to contribute to the stability of the whole body. We indicated that is correct footing is an important factor in minimizing the next deduction factor. This comparative analysis of the taekwondo kicking motion is considered a very valuable study that can provide important information to the training site or school site. Further studies are needed to analyze the difference between the success and failure of the next kick, the required muscle activity, and the various and instantaneous speed of the center of gravity.
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
최보경(Choi, Bo kyung),허보섭(Heo, Bo-Seob),이효택(Lee, Hyo-Taek),박찬호(Park, Chan-Ho),김용재(Kim, Yong-Jae) 동북아시아문화학회 2016 동북아시아문화학회 국제학술대회 발표자료집 Vol.2016 No.7
The military arts Taekwondo boasts a long history and a deep-rooted tradition. According to data from the World Taekwondo Headquarters(Kukkiwon), it must be represent Korea. However, training Poomsae has crumbled and recently problems of fairness and consistency steadily raised that is judges" judgments in poomsae competition. In this paper, we study about the Judges" judgments through Apchagi(front kick) motion in the Taekwondo Approved-Poomsae and would like to propose some improvement for the better in the poomsae game. Increasing the credibility could be one of the methods to boost the poomsae all over the world.
A Study on Joint Angle of Lower Extremity during Short Track Speed Skating
Jung Hoon Park,Ill Jung Seo,Bo Seob Heo,Yong Jae Kim 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.10
Objective: This study, which is conducted on two groups of skilled people and unskilled people, is purposed to analyze joint angle of lower extremity during short track speed skating, in order to find out efficient body position and propose ideal training method. Background: Short Track Speed Skating has a wide range of research areas, but their findings indicate a promising area for further research. Method: Targeting 8 people who are skilled in short track speed skating and 8 people who are not skilled in it, this study analyzes three dimensional images using super-high speed camera to compare differences between these two groups of people. In this study, 6 sections of body positions including right foot push-off, right foot recovery, right foot basic position, left foot push-off, left foot recovery, and left foot basic position were analyzed using 8 super-high speed cameras of VICON. These body positions were analyzed in order to find out joint angles of the hip joint, the knee joint, and the ankle joint. Results: In the section 4 of the inner and outer parts of the left hip angles showed significant difference, and most of the sections of knee joint angles also showed significant difference. In the section 1 and 2 of the plantar flexion, dorsiflexion of ankle joints showed significant difference(p< .001) Conclusion: It was found out that there were differences between groups of skilled people and unskilled people in terms of lower extremity’s joint angles such as angles of the hip joint, the knee joint, and the ankle joint.