보행 시 신발 밑창의 유형에 따른 몸통과 요부의 움직임 변화

황원섭 ( Won-seob Hwang ),류지선 ( Ji-seon Ryu ) 한국체육대학교 체육과학연구소 2015 스포츠사이언스 Vol.33 No.1

본 연구는 보행 용 유선형 신발과 일반형 신발에 대한 운동학적 요인 중 몸통과 요부의 3 차원 움직임을 분석하여 차이를 규명하는데 목적이 있다. 이 연구를 위해 참여한 대상자는 최근 1 년간 하지의 부상이 없는 30 개 남성 10 명 (171.5± 3.5 cm, 66.9 ± 8.3 kg, 34.2 ± 2.74세)을 대상으로 선정 하였다. 10 대의 카메라 (모션 캡처 시스템, Eagle4을)를 사용하였고 이때 촬영 속도는 120 F / S로 하였다. 또한 두 가지 유형의 신발을 분석하기 위해 3 개의 이벤트를 설정하여 계산하였으며, 결과는 다음과 같다. 첫째, 몸통의 굴곡과 신전의 각도를 분석 한 결과 유선형 신발과 일반형 신발 간 이벤트2에서 유선형 신발이 유의하게 신전하였다(P<0.05). 이 결과 추 후 신발 종류에 따라 3 차원 동작의 변화와 근전도 연구가 도움이 될 것으로 예상된다. The purpose of this study was to identify the changes in the movement of the three-dimensional movement of lumbar and trunk through kinematic analysis of postural stability streamline shoes (SS) and flat shoes (FS). Ten male s(body mass: 66.9±8.3 kg, height: 171.5±3.5 cm, age: 34.2±2.7 yrs) participated in this study. Three-dimensional motion analysis was performed on the section of gait using ten infrared cameras (sampling frequency of 120 Hz). Motions were divided into three events: right heel contact (E1), right toe off (E2), second right heel contact (E3). At E2 (p<.05), the extension angle of trunk was greater for SS than for FS. It is expected that these results will be useful in three=dimensional motion and electromyography study according to the type of shoes.

유도 맞잡기 유형에 따른 밭다리후리기의 운동역학적 분석

이연종(Yeon-Jong Lee),황원섭(Won-Seob Hwang),김진(Jin Kim) 한국여성체육학회 2016 한국여성체육학회지 Vol.30 No.1

장시간 보행이 중년여성의 발의 형태와 움직임 및 지면반력에 미치는 영향

박상균(Sang-Kyoon Park),류시현(Sihyun Ryu),황원섭(Won-Seob Hwang),이정호(Jungho Lee) 대한인간공학회 2018 大韓人間工學會誌 Vol.37 No.5

Objective: The purpose of this study was to investigate the changes in foot morphology and foot motion using a multi-segment foot model, and ground reaction forces during prolonged walking in healthy middle-aged females. Background: As people have experienced improved cardiovascular and muscularskeletal health, the popularity of prolonged walking has increased. However, only a few studies have suggested that prolonged walking may increase the risk of lower extremity joint injuries due to abnormal loading and decreased stability after muscle fatigue. Method: Forty-two healthy middle-aged females (mean age: 45.4 ± 2.3 years, mean height: 160.7 ± 4.8cm, mean weight: 59.2 ± 6.9kg, mean foot size: 23.3 ± 0.7cm) participated in the study. The participants went through measurements of foot morphology and Q- angle before and after 40 minutes" walking. The participants were asked to walk at a speed of 1.1m/sec for 40 minutes. Foot motion and ground reaction forces were collected at three time intervals (0, 20 and 40 minutes). Changes in variables were compared at an alpha level of .05 using a paired t-test and repeated ANOVA, respectively. Results: Arch index was decreased and Q angle was increased after 40 minutes" walking (p < 0.05). Increased toe out angle and attack angle of the foot at initial contact were observed as walking time progressed (p < 0.05). Increased flexion angles of multi-segment foot were found with increased walking time (p < 0.05). Finally, the participants experience greater braking force after 40 minutes" walking compared with 0 minutes and after 20 minutes (p < 0.05). Conclusion: The participants experience kinematic and kinetic changes of the foot during a prolonged period of walking. Application: The current findings suggest important biomechanical considerations when applying a walking intervention in a clinical trial to improve fitness or in developing adequate walking shoes.

2011 대구세계육상선수권대회 여자 100m 허들 선수들의 운동학적 분석

류재균 ( Jae Kyun Ryu ),박영진 ( Young Jin Park ),류지선 ( Ji Seon Ryu ),김태삼 ( Tae Sam Kim ),황원섭 ( Won Seob Hwang ),박상균 ( Sang Kyoon Park ),윤석훈 ( Suk Hoom Yoon ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5

The purpose of this study was to investigate the kinematic characteristics of the 5th and 6th hurdle clearances during the final of the 100-m hurdles event at the IAAF World Championships, Daegu 2011. To this end, the hurdling motions of the top 4 ranked female hurdlers in the competition were analyzed. A total of 12 cameras were used to record their motions, with a sampling frequency of 120 Hz. The cameras were calibrated using 11×2×1 m control objects that covered all of the lanes (1st~ 8th lanes). After analyzing all the data, we arrived at the following results. For the take-off phase, a negative relationship between the take-off time (CT) and athlete`s rank was found. In addition, the average distances from the hurdle to take-off (L1) were shown to be 2.23 m and 2.17 m for the 5th and 6th hurdles, respectively. For the distance from the hurdle to landing (L2), Pearson (1st rank) and Carruthers (2nd rank) showed inconsistent patterns whereas Harper (3rd rank) and Porter (4th rank) showed consistent patterns. All althetes revealed similar 3 steps patterns between hurdles, which consisted of a shorter 1st step, longer 2nd step and shorter 3rd step.

2011 대구세계육상선수권대회 100m 남자 결승전 중간질주구간의 운동학적 분석

류지선 ( Ji Seon Ryu ),류재균 ( Jae Kyun Ryu ),김태삼 ( Tae Sam Kim ),박영진 ( Young Jin Park ),황원섭 ( Won Seob Hwang ),윤석훈 ( Suk Hoon Yoon ),박상균 ( Sang Kyoon Park ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5

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.

2011 대구세계육상선수권대회 100 m 여자 결승전의 운동학적 분석

류지선 ( Ji Seon Ryu ),류재균 ( Jae Kyun Ryu ),김태삼 ( Tae Sam Kim ),박영진 ( Young Jin Park ),황원섭 ( Won Seob Hwang ),윤석훈 ( Suk Hoon Yoon ),박상균 ( Sang Kyoon Park ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5

The purpose of this study was to analyze the kinematic characteristics of the finalists in the women`s 100 m event to provide important information to coaches and athletes. Three different biomechanics techniques were applied for analyzing sprinter motion: LAVEG, a panning technique, and 12 video cameras for 3 dimensional analysis of the 40 m - 70 m portion of the race. Carmelita Jeter (USA) performed the maximum speed of 10.54 m/s at the distance of 58.2 m. There was a tendency to show a better performance time with a high number of steps (p=.13) and shorter stride length (p=.14) among the 8 sprints. Furthermore, the stride frequency and the performance time were negatively correlated as a higher stride frequency had a positive impact on the performance time (p=.02), Based on 3 dimensional analysis, the 4 top ranked sprinters used the different strategies to maintain a high COM (Center of Mass) velocity during the mid portion of the race (40 m - 70 m). Carmelita Jeter (USA) showed more flexed knee and hip motion at heel contact (HC) to maintain a high COM velocity while S.A. Fraser-Pryce (JAM) showed more extended knee and hip motion at HC. On the other hands, Veronica Campbell-Brown (JAM) and Kelly-Ann Baptiste (TRI) showed a tendency to have high knee lifts during the swing phase to maintain the high COM velocity during the race. These biomechanical analyses of the women`s 100 m final event in the 2011 WC, Daegu, will provide important scientific information to coaches and athletes for understanding the sprinting mechanism of today`s top-class sprinters.

2011 대구세계육상선수권대회 110m 허들 선수의 허들링 기술 동작의 운동학적 분석

박영진 ( Young Jin Park ),류재균 ( Jae Kyun Ryu ),류지선 ( Ji Seon Ryu ),김태삼 ( Tae Sam Kim ),황원섭 ( Won Seob Hwang ),박상균 ( Sang Kyoon Park ),윤석훈 ( Suk Hoon Yoon ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5

The purpose of this study was to evaluate the kinematic characteristics of 5th and 6th hurdle clearances during the final of the 110-m hurdles at the IAAF World Championships, Daegu 2011. To this end, the hurdling motions of the top 4 ranked male hurdlers in the competition were analyzed. A total of 12 cameras were used to record their motions, with a sampling frequency of 120 Hz. The cameras were calibrated using 11 × 2 × 1 m control objects that covered all of the lanes (1st~8th lanes). After analyzing all the data, we arrived at the following results. In the take-off phase, all athletes revealed similar take-off times (CT), and similar distances from the take-off to hurdleto (L1) and hurdle to landing (L2). In particular, Turner, ranked 3rd, had an inconsistent L2 and may need further training to correct it. In the flight phase, Richardson, ranked 1st, showed the longest flight distance, whereas Xiang, who was ranked 2nd, showed the highest CG height from the hurdle. For the step patterns, to increase the pitch frequency, Richardson and Xiang used shorter 3-step lengths than Turner and Oliver.