• Korean Journal of Applied Biomechanics
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• v.21 no.5
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• pp.511-520
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• 2011

The purpose of this study was to provide scientific information to track and field coaches and athletes through the analyses of the biomechanics characteristics of the top 4 sprinters in the men's 100 m final in the IAAF World Championships Daegu 2011. Twelve video cameras (Sony, Japan) were used to capture the mid portion of the race (40 m - 70 m) with a sampling frequency of 60Hz. Biomechanical variables including the right ankle, knee and hip angles, the trunk angle, and the velocity of center of mass (COM) in the running direction, were calculated with the Kwon 3D program (Visol, Korea). Correlation coefficients between the COM velocity and each variables were calculated using Matlab 2008a (MathWorks, USA) at an alpha level of 0.05. The findings indicated that Yohan Blake (JAM) showed greater range of motion at the ankle and hip. Walter Dix(USA) showed greater knee and trunk movement, and Kim Collins (SKN) showed more dorsi-flexed and extended trunk angles during the race. Finally, Christophe Lemaitre (FRA) showed more plantar-flexed ankle with a less trunk motion, throughout the analyzed race.

• Korean Journal of Applied Biomechanics
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• v.20 no.3
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• pp.253-259
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• 2010

The aim of IAAF's Biomechanics project, initially launched at the 1987 World Championships in Rome, is to support athletes and coaches in the optimization and improvement of their training and competition performance. The IAF and the IAAF supports biomechanical projects, as a service to their Member Federations, starting from the IAAF World Championships in Rome 1987. In 1997, at the IAAF World Championships of Athens. In 1995, at the IAAF World Championships in Goteborg and in co-operation with the Swedish Sport Institute of Karlstad and under the leadership of Anders Bergstrom a biomechanical research on "Throws" was conducted. In 2005, at the IAAF World Championships in Helsinki on 100m - Pole vault, High Jump, Triple Jump, Javelin, under the leadership of Prof. Paavo Komi. The IAAF published the final report in 2008 with a supplement of NSA. In 2007, at the IAAF World Championships of Osaka, in co-operation with Osaka University of Health and Sport Sciences and under the leadership of Prof. Michiyoshi Ae the IAAF received a final report on; short sprint, distance running, high jump, long jump, shot put and javelin. In 2009, at the IAAF World Championships of Berlin, in co-operation with the DLV and the leadership of Helmar Hommel (GER). The purpose of this study is to draw up a plan to perform an effective biomechanics project at 2011 IAAF World championship in Daegu.

• The Journal of Korean Society for School & Community Health Education
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• v.10 no.2
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• pp.29-42
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• 2009

연구목적: 본 연구는 고교운동선수들의 스포츠상해(부상)현황 파악을 통한 사고 및 손상예방을 목적으로 개발된 손상감시프로그램을 설명하고, 1년간 수집된 자료를 보고하기 위하여 수행되었다. 연구방법: 본 연구는 미국 플로리다주 내의 10개 고등학교에 재학 중인 학생 운동선수들의 스포츠상해(부상)에 대한 세부내용(사고경위, 상해부위, 사고 당시 환경적 요소 등)을 수집하여 이루어졌다. 학생 운동선수들에게 발생한 스포츠상해 조사 및 보고는 2007년에서 2008년에 걸친 학기동안 각 학교에 배치된 운동트레이너(Certified Athletic Trainer)에 의해 이루어졌다. 연구결과: 조사기간 동안 10개 조사대상 고등학교에서 614건의 스포츠상해가 발생하였고, 연습 중 사고노출 비율(1,000회의 연습 중 1명의 선수가 상해를 입는 경우를 기준으로 함)에 있어서는 풋볼(Football)이 2.73을 기록해 가장 높은 상해율을 보였으며 여자축구(2.03)와 남자농구(1.67)가 그 뒤를 이었다. 실전경기 중 사고노출 비율(1,000회의 실전경기당 1명의 선수가 상해를 입는 경우를 기준으로 함)의 경우, 풋볼(Football)이 14.4, 여자농구가 9.96, 레슬링이 7.1을 기록하였다. 운동상해로 인한 증상은 염좌/삠(관절손상)이 가장 많았고, 가장 많이 다치는 신체부위는 발목, 무릎, 머리인 것으로 나타났다.

• Journal of the Korean Academy of Clinical Electrophysiology
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• v.8 no.1
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• pp.51-56
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• 2010

Purpose : This study identifies the effect of ankle-taping on limb asymmetry, postural sway and lumbar flexibility. Ankle-taping was applied for participants of this study and the results were compared to the control group. Methods : This study targets 46 adults, in which 25 composed the test group and 21 composed the control group. All participants were interviewed. For the test group, inflexible tapes of 5mm width were applied as designed by Danaka Nobudaka while the tapes for the control group were arranged in a symmetric direction to the direction of the test group. Postural balance was measured using Mediance (Human Tech Inc, Korea) and to identify lumbar flexibility, the trunk flexion is targeted. Results : 1. The postural inclination of both the groups decreased, but a statistically significant difference is not found (p>0.05). 2. Both the groups increased, but no statistically significant difference is found (p>0.05). 3. Both the groups increased, and a statistically significant change is found (p<0.05). Conclusion : As demonstrated in the results above, ankle taping is effective for lumbar flexibility as well as stability of ankle joints regardless of the direction of taping. It also suggests that ankle taping is helpful for health management of athletes and the public. However, as the results are limited in that they were obtained 10 minutes after taping, it is hoped that further studies will follow.

• Journal of the Korea Convergence Society
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• v.9 no.10
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• pp.423-432
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• 2018

The purpose of this study was to investigate the differences in upper and lower strengths and symmetry between upper body injury group, lower body injury group and non-injury group of bowling athletes. The subjects were the upper body injury group (UG), n = 16, the low body injury group (LG), n = 8, the non injury group, [NG], n = 15). The isometric strength of the bowler was measured using Manual Muscle Tester 01165 (Lafayette Instrument Company, USA) and the symmetry index (SI) was calculated. The results were as follow. The symmetry index of hip extension strength and hip external rotation strength was statistically larger in NG than LG (p <.05). The above results suggest that lower body strength and bilateral symmetry was closely related to injuries of the lower body. In order to prevent injury of the bowler, strengthening of lower body strength and symmetrical training are needed.

• Korean Journal of Human Ecology
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• v.15 no.3
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• pp.481-490
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• 2006

Adjusting pressure level in the construction of athletes' tight-fitting garments by reducing the elastic knit pattern is a challenging subject, which influences the performance of the wearer directly. Therefore, in this study, relationship between the reduction rates of the basic pattern obtained from 3D human scan data and resultant clothing pressure was explored to improve the fit and pressure exerted by clothing. 3D scan data were obtained using Cyberware and they were transformed into a flat pattern using software based on Runge-Kutta method. Reduction rate was examined by subjective wear test as well as objective pressure measurement. As a result, difference in the length between the original 3D body scan data and the 2D tight-fitting pattern was 0.02$\sim$0.50cm (0.05$\sim$1.06%), which was within the range of tolerable limits in making clothes. Among the five garments, the 3T-pattern was superior in terms of subjective sensation and fit. The pressure of the 3T pattern was 2$\sim$4 gf/cm2 at five locations on the body, which is almost the same or a bit higher than that of Z-pattern. In the case of tight-fitting overall garment, the reduction rate of the pattern in the wale direction is more critical to the subjective sensation than the course direction. It is recommended that the reduction grading rules of course direction should be larger than that of Ziegert for a better fit of tight-fitting garments. In the case of wale direction, however, reduction grading rule should be kept the same as suggested earlier by Ziegert (1988).

• Journal of Korean Orthopaedic Sports Medicine
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• v.5 no.2
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• pp.100-104
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• 2006

The Incidence of groin injury was about 10% in football player These injuries occur most commonly in athletes participating in sports Involving cutting, quick accelerations and decelerations and sudden directional changes. Symptoms may range from intermittent episodes of mild discomfort to severe and chronic career-ending pain. Groin injuries may result from a variety of causes. We must keep in mind that many other conditions may also affect the groin. Because of the anatomy of the region is so complex. Ligament/muscle strains, nerve entrapment syndromes, sportsman's hernia, symphysitis, stress fractures and various hip pathologies are reviewed as causes of groin pain are reviewed as common causes of groin pain.

• Journal of Korean Orthopaedic Sports Medicine
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• v.6 no.2
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• pp.115-118
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• 2007

Rupture of the pectoralis major muscle may occur in youngers or athletes associated with extreme sports, especially during the weight training. It is uncommon, but the incidence is increased by the recent growth of athletic population, According to the drift, variable methods of operative treatment for the functional and cosmetic recovery are introduced. We report a case of pectoralis major muscle rupture which was successfully repaired using transosseous repair and suture anchors five months after the initial injury during the bench-pressing.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 1995.05a
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• pp.22-22
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• 1995

One hundred and forty-eight cases of tennis elbow were treated by conservative managements firstly such as rest, medication, immobilization, physical therapy and local steroid injection, from Jan. 1985 to Jun. 1994 at Department of Orthopaedic Surgery, National Medical Center. Among the 148 cases, 16 cases who failed conservative managements, were treated with Nirschl & Pettrone operation. The results were summarized as follows, 1. Among the 148 cases, 110 cases$(74\%)$ were female, and 61 cases$(41.2\%)$ were in the age group 41 to 50, and mean age was 42.3 2. Ninety-nine cases were housewives and only 15 cases were related to sports. 3. The results 116cases$(78\%)$, of conservative treatment were excellent and good 10 fair and failure in 32 cases$(22\%)$, by Nirschl and Peettrone assessment. 4. Among the 16 cases who were treated with Nirschl and Pettrone operation, excellent result was obtained 10 7cases, good in 3 cases, fair in 4cases and failure in 2 cases. 5. Recurrence was developed in 18 cases$(12.2\%)$, and we obtained excellent & good result in 17 cases with both conservative and operative treatment. Above results suggest that the term, tennis elbow is a misnomer because it occurs more commonly in non-athletes such as housewives than in tennis players. So it seems to be a occupational disease rather than sports injury. Now, we propose eliminate of the term, elbow and substitute with terminology that described the true understanding and therapeutic orientation of it.

• Korean Journal of Applied Biomechanics
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• v.22 no.1
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• pp.55-63
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• 2012

The purpose of this study was to investigate the balance differences between skilled players and less-skilled players during Hakdariseogi motion of Keumgang Poomsae in Taekwondo. To achieve the study goal, total of 10 Taekwondo athletes; 5 skilled players(S, body mass: $67.0{\pm}5.7$ kg, height: $174.0{\pm}4.8$ cm, age: $20.0{\pm}2.0$ yrs) and 5 less-skilled players(LS, body mass: $73.0{\pm}4.9$ kg, height: $176.4{\pm}6.1$ cm, age: $20.8{\pm}1.3$ yrs) participated in this study. A three-dimensional motion analysis with 8 infrared cameras and one force plate whose sampling frequency as 30 Hz and 300 Hz, respectively, were performed. Participants' motion were divided into three phases which were preparation phase(P1), performing phase(P2) and maintaining phase(P3). The range and velocities of COP, the range and RMS of ground reaction torque and displacement between COM and center of BOS of each phase were computed. In this study, at P1 and P3 which were double and single stance, respectively, the range and M-L velocities of COP revealed significantly higher in LS compared with those of S(p<.05). At P2 which was single stance, LS indicated significantly higher in range of COP and ground reaction torque, and M-L velocities of COP than those of S(p<.05). The significantly shorter displacement between COM and center of BOS, however, was found in LS compared with that of S(p<.05). The results from our study indicated that S revealed more stable performance and a better posture control ability during performing Hakdariseogi motion.