족저압력분포 측정장비를 이용한 골프 스윙시 족저압 분석

이동기,이중숙,이범진,이훈식,김용재,박승범,주종필 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1

D. K. LEE, J. S. LEE, B. J. LEE, H. S. LEE, Y. J. KIM, S. B. PARK, J. P. JOO. PIantar foot pressure analysis during golf swing motion using plantar foot pressure measurement system. Korean Journal of Sport Biomechanics, Vol. 15, No. 1, pp. 75-89, 2005. In this study, weight carrying pattern analysis and comparison method of four foot region were suggested. We used three types of club(driver, iron7, pitching wedge). This analysis method can compare between top class golfer and beginner. And the comparison data can be used to correct the swing pose of trainee. If motion analysis system, which can measure the swing speed and instantaneous acceleration at the point of hitting a ball, is combined with this plantar foot force analysis method, new design development of golf shoes to increase comfort and ball flight distance will be available. 1. Address acting, forces concentrated in rare foot regions and lateral foot of right foot. Back swing top acting, relatively high force occurred in medial forefoot region of left foot and forefoot region of right foot. Impact acting, high force value observed in the lateral rarefoot region of left foot and medial forefoot region of right foot. Finish acting, force concentration observed on the lateral region and rarefoot region of left foot. 2. Forces were increased in address of right foot with clubs length increased. All clubs, back swing top acting, high force value observed in the lateral forefoot region of right foot. All clubs, in impact, high force value observed in the lateral rarefoot region of left foot and medial forefoot region of right foot. Finish acting, force concentration observed on the rarefoot region in driver and lateral foot region in iron on left foot. 3. Right foot forces distribution were increased in address, back swing top and left foot force distribution were increased in impact, finnish

테니스 라켓 스트링 장력의 차이에 따른 근전도 분석

이훈식,서국웅,윤양진,정미라,김용재,서국은,이중숙 한국운동역학회 2000 한국운동역학회지 Vol.9 No.2

The purpose of this paper is to select 7 male athletes and female athletes of high school, and to compare their active potential differences of upper arm muscles according to characteristic of a racket. the results obtained are as follows: 1. In the accumulative distribution rate of racket string tension, 65Ibs is higher in all muscle active potentials except male flexor carpi radialis muscle than 55Ibs or 60Ibs, and this result shows that 65Ibs gives lower efficiency to athletes. 2. In the muscle load rate of racket string tension, 55Ibs shows the lowest active muscle potential and is thought to be better in its efficiency, but 66Ibs shows a little high active potential and is thought not to be good in its efficiency.

핸드볼 점프 슛 동작의 운동학적 분석

이중숙,조승제 한국운동역학회 2001 한국운동역학회지 Vol.11 No.1

This study attempts to analyze the kinetic characteristics of the jump shoot motion in handball and compare the differences between male and female players. Photography by 6 camcorders and measurement of strength using a force platform were simultaneously performed. The conclusion is as follows : 1. The vertical displacement of the COG in male was significantly 10.3㎝ higher at its maximum height than in female. At the moment of shooting, the height of the COG was slightly lower than before. 2. The FIVV(foot touch vertical velocity) of the COG in male(support time : 0.17sec) and female(support time : 0.20sec) was quickly increased and the TOVV(take-off vertical velocity) of the COG was at its highest and the differences between men and women were meaningful(t=4.23, p<0.01). 3. The angle of ankle joint in supporting leg of men(83.90±3.49˚ ) was significantly different from that of women(79.40±3.48˚ ) at its minimum, the angle of kneee joint in supporting leg of men(130.10±5.18 ˚) was significantly different from that of women(124.70±4.18˚ ) at its minimum, whereas the angle of hip joint in supporting leg of women was significantly different from that of men at the foot-touch(t=2.26^*, p<0.05) and the take-off phase(t=3.13^**, p<0.01). 4. The change of the wrist joint angle in female was higher effectively dorsi flexion performance(snap) than in male at the moment of shoot. But the differences between men and women were not meaningful. 5. The change of the angle between forearm and hand plane in women was higher rapidly dorsi flexion performance than in male. And the differences between men and women were meaningful(t=2.00, p<0.05).

준비동작의 형태 변화에 따른 신체 움직임의 운동역학적 분석

이중숙 한국운동역학회 2002 한국운동역학회지 Vol.12 No.2

본 연구의 목적은 현대 스포츠가 점점 스피디하고 격렬한 상황의 연출을 요구하고 있는 상황에서 순간적으로 신속 정확한 판단력과 그에 따른 재빠르고 민첩한 행동이 필요할 때가 많으므로 준비동작에 대한 운동역학적 메카니즘의 이해가 필요하다고 판단되어 연구를 실시하였다. 따라서 본 연구에서는 준비동작의 형태 변화(open stance & cross stance)에 따른 신체움직임을 운동역학적인 분석을 통하여 바람직한 준비동작의 모델을 제시하는데 있으며, 이러한 연구 목적을 달성하기 위하여 연구대상자는 부산 B대학교 핸드볼 선수인 남학생 5명과 부산 S대학교 사격 선수인 여학생 5명을 선정하여 실험하였다. 준비자세에서의 좌 · 우 · 전방향으로 이동시의 동작을 2대의 고속 비디오 카메라와 2대의 지면반력기 그리고 전신반응측정 장비를 이용하여 자료를 수집하였고, 준비자세에서의 좌 · 우 · 전방향 이동시의 메카니즘을 분석한 결과 다음과 같은 결론을 얻었다. 첫째, 준비자세에서 좌 · 우 · 전방향 이동시 cross stance 자세가 open stance 자세 보다 신체중심이동 속도가 빠른 것으로 분석되었으며, Take-off시 슬관절의 굴곡각은 약 175˚의 각도를 유지하고, 고관절의 굴곡각은 약 172˚ 의 각도를 유지하여 준비자세를 취하는 것이 바람직한 것으로 분석되었다. 둘째, 준비자세에서의 좌 · 우 · 전방향으로 이동시 지지시간과 지면반력분석 결과를 종합해 보면 준비동작에서 왼쪽방향으로 이동시 가장 빠른 신체중심이동 속도를 나타냈다. 셋째, 준비자세에서 좌 · 우 · 전방향 이동시 지면반력 분석 결과에서도 cross stace 자세가 open stance 자세보다는 왼발과 오른발에 체중을 적절히 분산시켜 준비동작을 수행할 수 있도록 하여 상해를 예방할 수 있으므로 cross stance 준비자세가 바람직한 것으로 분석되었다. 따라서 준비자세의 역학적인 메가니즘은 cross stance 자세가 open stance 자세보다 보다 바람직한 준비자세라고 할 수 있으나 반드시 개인차도 고려되어져야 할 것이다. The purpose of this research is to provide a proper model by analyzing the sports biomechanical of physical movements on the basis of the two patterns(open-stance and cross-stance) at the ready-to-start pose. The subjects for this study are composed of five male handball players from P university and five female shooting players from S university. Three-way moving actions at start(right, left, and forward) are recorded with two high-speed video cameras and measured with two Force platforms and a EMG system. Three-dimensional action analyzer, GRF system, and Whole body reaction movement system are used to figure out the moving mechanisms at the start pose. The analytic results of the moving mechanism at the start pose were as follows. 1. Through examining the three-way moving actions at start, I have found the cross-stance pose is better for the moving speed of body weight balance than the open-stance one. 175 degree of knee joint angle at "take-off" and 172 degree of hip joint angle were best for the start pose. 2. The Support time and GRF data shows that the quickest center of gravity shift was occurred when cross-stanced male subjects started to move toward his lefthand side. the quickest male's average supporting time of left and right foot is 0.19±0.07 sec., 0.26±0.06sec. respectively. The supporting time difference between two feet is 0.07sec. 3. Through analyzing GRF of moving actions at start pose, I have concluded that more than 1550N are overloaded on one foot at the open-stance start, and the overloaded force may cause physical injury. However, at the cross-stance pose, The GRF are properly dispersed on both feet, and maximum 1350N are loaded on one foot.

축구화 스터드의 형태변화에 따른 회전마찰력

이중숙,박상균 한국운동역학회 2004 한국운동역학회지 Vol.14 No.2

J. S. LEE, S. K. Park. Rotational Friction of Different Soccer Stud. Korean journal of Sport Biomechanics, Vol. 14, No. 2, pp. 121-138, 2004. The design of soccer studs is important for providing friction on a variety of surfaces. We hypothesized that a certain type of soccer studs could improve performance due to high rotational friction. Thus, this study was conducted to determine the relationship between the frictional characteristics and different soccer stud design. Twelve recreational soccer players were recruited. Rotational friction data from the force plate was collected for all subjects during normal walking with 180 degree rotation. Walking speed was controlled at 1.2 m/s (±0.1 m/s) with timing lights on infilled artificial turf. Three different types of soccer studs and one running shoe were tested. Repeated measures ANOVA was used to determine significance. Significant differences were found in rotational friction with four different shoes. Trx and World studs tended to have greater maximum rotational friction than the running shoe (Nova) and traditional soccer shoe(Copa Mondial). The results were as follow : world(25.95Nm) ) trx(25.74Nm) ) copa(22.50Nm) ) nova(16.36Nm). The difference may be due to the number, location, size, and shape of studs. We concluded that stud design influences rotational friction between the shoe and surface during movement. Based on studs design and contact area, Trx with blade type studs are recommended since it showed high rotational friction for performance as well as enough contact area for stability. However, differences due to the mechanical properties of soccer studs are still being investigated.

중등교원연수원 체육과 교재 개발 방향

이중숙 신라대학교 교육과학연구소 1999 교육과학연구 Vol.- No.4

근전도 시스템을 이용한 테니스 퍼스트와 세컨드 서비스의 생체역학적 연구-남ㆍ여 고교 테니스선수를 중심으로 : 남ㆍ여 고교 테니스선수를 중심으로

이중숙,강재형,유창재,양정옥,이훈식 가톨릭대학교 자연과학연구소 2001 自然科學論文集 Vol.9 No.-

This study selected each seven high-school tennis players of male and female and analyzed the M.RA according to the type of tennis service and the Muscle Active Potential of M.ES by using an electromyogram system. The results as follows; 1.The Muscle Active Potential of female tennis players is higher than that of male tennis players in M.RA according to Tennis Service Types. 2.The Muscle Active Potential of female tennis players is higher than that of male players in M.ES according to Tennis Serrice Types. 3.In male and female M.RA, the Muscle Active Potential of right and left showed the contrary results. 4.In male and female M.ES, the Muscle Active Potential is high in the second service in the case of male and in the first service in the case of female. 5.Female tennis player can improve efficiency in the aspect of biomechanics by strengthening the muscle of M.RA and M.ES. 6.The second service of male tennis player showed less efficient Muscle Active Potential than his first service because of excessive trunk muscle twist.

중등학교 체육교육 현장의 실태 분석

이중숙 신라대학교 교육과학연구소 1999 교육과학연구 Vol.- No.4

중학생의 특기 · 적성 교육활동과 정서 및 사회성간의 관계

이중숙,유창재,양정옥,김영수,최성우 신라대학교 교육과학연구소 2005 교육과학연구 Vol.- No.10

Snatch & Jerk 동작의 생체역학적 연구

이중숙,김용재 신라대학교 자연과학연구소 1997 自然科學論文集 Vol.4 No.-

The purpose of this study was to prepare some useful data for the improvement of weightlift performance ability and the prevention of injury by analyzing the biomechanic in snatch & jerk of weightlifter. Biomechanic variables were analyzed with the aid of the visual materials with a high speed video camera, such as the displacement of barbell, the time during the motion and moment of the snatch & jerk motion. The analysis of EMG data by the EMG system revealed the action potential of muscles. The subjects for the research were 8 in male and female Korean national team weightlifter ; 4 of them male, 4 of female in both sexes. The analytic results of the mechanism of the snatch & jerk motion were as follows: 1. The vertical displacement of barbell in the snatch, both male, female weightlifter group had the highest vertical displacement of barbell in the 4th step. 2. The vertical displacement of barbell in the clean, there was little significant difference between male and female weightlifter. 3. The vertical displacement of barbell in the jerk, the change width of barbell of the female weightlifter group was wither, and higher of COG was the reason of failure. 4. The vertical displacement of barbell in the weightlifting, the more time of 4th step got short, the more maximum extension effect of body segment large. It was the main reason to increase the added rising height of barbell. 5. The time during the motion in the weightlifting, it was efficient to use possible the shorter time. 6. The moment was loaded in elector spinae(L5, S1) joint, there was showed a rapid increase of extension moment in the 2nd step. 7. In the EMG analysis, snatch and jerk in male weightlifter, commonly was very higher used in order of vastus lateralis muscle(1st step), biceps femoris muscle(2nd step), trapezius muscle(4th step), and elector spinal(2nd step). The purpose of this study was to prepare some useful data for the improvement of weightlift performance ability and the prevention of injury by analyzing the biomechanic in snatch & jerk of weightlifter. Biomechanic variables were analyzed with the aid of the visual materials with a high speed video camera, such as the displacement of barbell, the time during the motion and moment of the snatch & jerk motion. The analysis of EMG data by the EMG system revealed the action potential of muscles. The subjects for the research were 8 in male and female Korean national team weightlifter ; 4 of them male, 4 of female in both sexes. The analytic results of the mechanism of the snatch & jerk motion were as follows: 1. The vertical displacement of barbell in the snatch, both male, female weightlifter group had the highest vertical displacement of barbell in the 4th step. 2. The vertical displacement of barbell in the clean, there was little significant difference between male and female weightlifter. 3. The vertical displacement of barbell in the jerk, the change width of barbell of the female weightlifter group was wither, and higher of COG was the reason of failure. 4. The vertical displacement of barbell in the weightlifting, the more time of 4th step got short, the more maximum extension effect of body segment large. It was the main reason to increase the added rising height of barbell. 5. The time during the motion in the weightlifting, it was efficient to use possible the shorter time. 6. The moment was loaded in elector spinae(L5, S1) joint, there was showed a rapid increase of extension moment in the 2nd step. 7. In the EMG analysis, snatch and jerk in male weightlifter, commonly was very higher used in order of vastus lateralis muscle(1st step), biceps femoris muscle(2nd step), trapezius muscle(4th step), and elector spinal(2nd step).