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한국운동역학회지 update

Korean Journal of Sport Biomechanics

  • : 한국운동역학회
  • : 예체능분야  >  체육학
  • : KCI등재
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  • : 연속간행물
  • : 계간
  • : 1226-2226
  • : 2093-9752
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수록정보
수록범위 : 2권1호(1992)~30권2호(2020) |수록논문 수 : 1,165
한국운동역학회지
30권2호(2020년 06월) 수록논문
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KCI등재

1Effect of Kinetic Degrees of Freedom on Hierarchical Organization of Multi-element Synergies during Force Production and Releasing Tasks

저자 : Kitae Kim , Junkyung Song , Jaebum Park

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 30권 2호 발행 연도 : 2020 페이지 : pp. 131-144 (14 pages)

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Objective: The purpose of this study was to examine the effect of degrees of freedom on the multi-synergies in two hierarchies of human hand system during force production and releasing tasks.
Method: In this study, the constrained movements of the aiming and releasing actions using both hands and fingers during archery-like shooting were implemented as experimental tasks. The participants produced a pulling force holding the customized frame (mimicking an archery bow, with a set of force transducers) and kept it consistently for about 5 seconds, and released fingers as quickly as possible in a self-paced manner within the next 5 seconds. An analytical method based on the uncontrolled manifold hypothesis was used to quantify the stability index (synergy index) in two hierarchies including two hands (upper hierarchy) and individual fingers (lower hierarchy).
Results: The results confirmed that the positive synergy pattern showed simultaneously at the upper and lower hierarchies, and the kinetic degrees of freedom were associated with the increment of hierarchical synergy indices and the performance indices. Also, the synergy indices of both hierarchies showed significant positive correlations with the performance accuracy during the task.
Conclusion: The results of this study suggest that the human control system actively uses extra degrees of freedom to stabilize task performance variables. Further increasing the degree of freedom at one level of hierarchy induces positive interactions across hierarchical control levels, which in turn positively affects the accuracy and precision of task performance.

KCI등재

2달리기 시 충격력과 충격 쇼크 변인들과의 관계

저자 : Sang-kyoon Park , Ji-seon Ryu

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 30권 2호 발행 연도 : 2020 페이지 : pp. 145-154 (10 pages)

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Objective: The purpose of this study was to determine the relationship between impact and shear peak force, and tibia-accelerometer variables during running.
Method: Twenty-five male heel strike runners (mean age: 23.5±3.6 yrs, mean height: 176.3± 3.3 m/s, mean mass: 71.8±9.7 kg) were recruited in this study. The peak impact and anteroposterior shear forces during treadmill running (Bertec, USA) were collected, and impact shock variables were computed by using a triaxial accelerometer (Noraxon, USA). One-way ANOVA was used to test the influence of the running speed on the parameters. Pearson's partial correlation was used to investigate the relationship between the peak impact and shear force, and accelerometer variables.
Results: The running speed affected the peak impact and posterior shear force, time, slope, and peak vertical and resultant tibial acceleration, slope at heel contact. Significant correlations were noticed between the peak impact force and peak vertical and resultant tibia acceleration, and between peak impact average slope and peak vertical and resultant tibia acceleration average slope, and between posterior peak (FyP) and peak vertical tibia acceleration, and between posterior peak instantaneous slop and peak vertical tibial acceleration during running at 3 m/s. However, it was observed that correlations between peak impact average slope and peak vertical tibia acceleration average slope, between posterior peak time and peak vertical and resultant tibia acceleration time, between posterior peak instantaneous slope and peak vertical tibial acceleration instantaneous slope during running at 4 m/s.
Conclusion: Careful analysis is required when investigating the linear relationship between the impact and shear force, and tibia accelerometer components during relatively fast running speed.

KCI등재

3유소년 축구 경기에서 발생하는 머리 충격은 안전할까?

저자 : David O'sullivan , Myung-hoo Kwak , Yun-sik Kim , Hee Seong Jeong

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 30권 2호 발행 연도 : 2020 페이지 : pp. 155-163 (9 pages)

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Objective: This study to identify the mechanism of head impact that occurs during youth soccer game with regard to head injuries in sports.
Method: Ten male subjects (age: 10.0±2.0 yrs.) were participated during 10 soccer practices spread out over a time period of 10 weeks. During each soccer game, the participants agreed and wore the X-Patch (wireless accelerometer, gyroscopes). The X-Patch records the head impact mechanics, such as peak linear acceleration (PLA), peak rotational acceleration (PRA), peak rotational velocity (PRV), Head Injury Criterion (HIC), and the location of impact.
Results: A total of 501 impacts to the head were measured over the 10 soccer games, PLA 17.8± 10.4 g, PRA 3168±2442 rad/s2; PRV 16.1±10.6 rad/s; HIC 11.7±34.2. The severity of impact was classified into 3 ranges; low 10~39 g (482 impacts); medium 40~69 g (17 impacts); and high >69 g (2 impacts). There are no significant differences in PLA and HIC (p=0.08, p=0.15), however PRA and PRV show the differences (p<.05) between each of the participants. For the analysis comparing between the soccer games, there are no significant differences in PLA, PRA, PRV and HIC (p=0.11, p=0.13, p=0.14, p=0.05).
Conclusion: Our results indicated that there were significant differences between athletes, especially in terms of rotational acceleration, whereas there were significant differences in linear and rotational based variable between each of the soccer games. Although the vast majority of impacts were below 39 g there were 2 potentially dangerous impacts above 69 g. It is important that future research continuous to measure head impact mechanics during soccer to help understand head injury mechanisms to ensure the safety of athletes.

KCI등재

4고등학교 야구 포수의 2루 송구 동작에 대한 운동역학적 분석

저자 : Sung Yong Kim , Jong Chul Park , Kyung Seok Byun , Hee Young Baek

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 30권 2호 발행 연도 : 2020 페이지 : pp. 165-172 (8 pages)

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Objective: The purpose of this study was to provide quantitative and objective data of throwing movement in baseball catcher through biomechanical analysis.
Method: Eight high school baseball catchers (age: 17.3±0.7 yrs, height: 175.3±4.5 cm, weight: 82.5±9.0 kg, Career: 7.4±2.1 yrs) participated and 3-dimentional motion capture system and electromyography (EMG) were used in this study.
Results: The maximum center of mass position displacement was observed in forward direction. The linear velocity magnitude of the upper extremity segments were showed as "wrist>elbow> shoulder" which is indicative of kinematic chain. For kinetic EMG data, we also observed the greater muscle activation in the left brachioradial and erector spine muscles muscle that during throwing movement.
Conclusion: We expect that biomechanical data from this study will provide important training implications to baseball coaches and trainers in order to effectively train their baseball catchers.

KCI등재

5신발 분야 국내외 운동역학 연구동향 분석: 2015-2019년에 발간된 연구를 중심으로

저자 : Heeyoung Back , Kyungock Yi , Jusung Lee , Jieung Kim , Jeheon Moon

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 30권 2호 발행 연도 : 2020 페이지 : pp. 185-195 (11 pages)

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Objective: The purpose of this study was to identify recent domestic and international research trends regarding shoes carried out in biomechanics field and to suggest the direction of shoe research later.
Method: To achieve this goal of research, the Web of Science, Scopus, PubMed, Korea Education and Research Information Service and Korean Citation Index were searched to identify trends in 64 domestic and international research. Also, classified into the interaction of the human body, usability evaluation of functional shoes, smart shoe development research, and suggested the following are the suggestions for future research directions.
Conclusion: A study for the coordination of muscle activity, control of motion and prevention of injury should be sought by developing shoes of eco-friendly materials, and scientific evidence such as physical aspects, materials, floor shapes and friction should be supported. Second, a study on elite athletes in various sports is needed based on functional shoes using new materials to improve their performance along with cooperation in muscle activities and prevention of injury. Third, various information and energy production are possible in real time through human behavioral information, and the application of Human Machine Interface (HMI) technology through shoe-sensor-human interaction should be explored.

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