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Korean Journal of Sport Biomechanics

  • : 한국운동역학회
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수록정보
수록범위 : 2권1호(1992)~29권2호(2019) |수록논문 수 : 1,132
한국운동역학회지
29권2호(2019년 06월) 수록논문
최근 권호 논문
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KCI등재

1여자 필드하키 페널티코너 전문 슈터 양성을 위한 Drag Flick 슈팅 동작의 운동학적 분석: 사례 연구

저자 : Jongchul Park , Kyungseok Byun , Eonho Kim

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 43-51 (9 pages)

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Objective: This study aims to propose an efficient technical model through a kinematic analysis of field hockey drag flick shooting motion in laboratory situations and game situations and to build up the basic data on drag flick shooting technique through a comparative analysis of a Korean specialized shooter and specialized shooters of competing Asian countries.
Method: This study selected one Korean female national specialized shooter and seven specialized shooters of competing countries, China, Japan, India, and Malaysia, who participated in the 2018 Asian Hockey Champions Trophy as research subjects. In exercise situations, a 3-D motion analysis utilizing an infrared camera was conducted, while in game situations, an image-based 3-D motion analysis utilizing a digital camera was conducted.
Results: The Korean specialized shooter had smaller changes in the angles of the trunk and the stick in game situations than in exercise situations. She had a high angular velocity of the trunk and the stick head, and the maximum speed of the ball was high. The Korean specialized shooter had the maximum angular velocity of the trunk higher than the specialized shooters of the competing countries did, and the angular velocity of the stick head and the maximum speed of the ball were in the average level.
Conclusion: As for drag flick shooting in game situations, changes in the angle of the trunk and the stick were small, and the angular velocity was high due to the pressure that the shooters should perform the motion fast with the defenders' interruptions, and this high angular velocity of the trunk and the stick head affected the movement of the ball. Thus, the maximum speed of the ball was higher in game situations than in exercise situations. The Korean specialized shooter had the maximum angular velocity higher than the specialized shooters of the competing countries did; however, the maximum speed of the ball was average, and it turned out that the maximum speed of the ball was associated with the angular velocity of the stick head in P3. Therefore, Korean specialized shooters need complementary training for a change to the torque of the stick head, using the strong torque of the trunk.

KCI등재

2농구 패스 리시브 시 숙련자와 비숙련자 간의 동작의 부드러움과 손가락 및 상지 협응의 차이

저자 : Sangheon Park , Hee Sung Lim , Sukhoon Yoon

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 53-60 (8 pages)

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Objective: The purpose of this study was to investigate the differences of smoothness and coordination of the fingers and upper extremities between skilled and non-skilled players during receiving the basketball.
Method: Ten male recreational basketball players (age: 23.2±2.7 yrs., career: 8.6±1.6 yrs., height: 177.3±6.0, weight: 72.9±8.5 kg) careering over five years and ten non-skilled males (age: 27.3± 1.5 yrs., height: 173.7±5.6, weight: 73.2±12.6 kg) were participated in this study. Then, participants were asked to perform basketball receiving movement for ten times. The receiving movements were recorded by eight infrared cameras (Oqus 300, Qualisys, Sweden). The collected rad data were calculated to duration of basketball receiving, Jerk-Cost, CRP and CRP variability.
Results: The CRP of MCP-Wr, Wr-El in skilled group were greater than non-skilled group (p<.05). The CRP variability of El-Sh in non-skilled group was greater than skilled group (p<.05).
Conclusion: These results suggest that skilled players perform more effective movement for impact absorption from the basketball. Moreover, the skilled players have consistent movement patterns during basketball performance. Lastly, it is important to train finger sensation and cognitive ability of thrown basketball from the passer.

KCI등재

3만성 발목 불안정성(CAI) 환자와 건강 대조군 간의 발목 관절 복합체 구조적 특징과 목말밑 관절 회전 축 기울기

저자 : Chang Young Kim , Ji Hye Ryu , Tae Kyu Kang , Byong Hun Kim , Sung Cheol Lee , Sae Yong Lee

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 61-70 (10 pages)

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Objective: This study aimed to investigate the characteristics of the declination of the subtalar joint rotation axis and the structural features of the ankle joint complex such as rear-foot angle alignment and ligament laxity test between chronic ankle instability (CAI) patients and healthy control.
Method: A total of 76 subjects and CAI group (N=38, age: 23.11 ± 7.63 yrs, height: 165.67 ± 9.54 cm, weight: 60.13 ± 11.71 kg) and healthy control (N=38, age: 23.55 ± 7.03 yrs, height: 167.92 ± 9.22 cm, weight: 64.58 ± 13.40 kg) participated in this study.
Results: The declination of the subtalar joint rotation axis of the CAI group was statistically different from healthy control in both sagittal slope and transverse slope. The rear-foot angle of CAI group was different from a healthy control. Compared to healthy control, they had the structure of rear-foot varus that could have a high occurrence rate of ankle varus sprain. CAI group had loose ATFL and CFL compared to the healthy control.
Conclusion: The results of this study showed that the deviation of the subtalar joint rotation axis and the structural features of the ankle joint complex were different between the CAI group and the healthy control and this difference is a meaningful factor in the occurrence of lateral ankle sprains.

KCI등재

450세 이상 성인의 보행 시 스마트폰 사용에 따른 자세 조절 전략

저자 : Yeon Joo Yu , Ki Kwang Lee , Jung Ho Lee , Suk Bum Kim

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 71-77 (7 pages)

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Objective: The aim of this study was to investigate postural control strategies on smart phone use during gait in over 50-year-old adults.
Method: 8 elderly subjects (age: 55.5±3.29 yrs, height: 159.75±4.20 cm, weight: 62.87±8.44 kg) and 10 young subjects (age: 23.8±3.19 yrs, height: 158.8±5.97 cm, weight: 53.6±5.6 kg) participated in the study. They walked at a comfortable pace in a gaitway of ~8 m while: 1) reading text on a smart phone, 2) typing text on a smart phone, or 3) walking without the use of a phone. Gait parameters and kinematic data were evaluated using a three-dimensional movement analysis system.
Results: The participants read or wrote text messages they walked with: slower speed; lesser stride length and step width; greater flexion range of motion of the head; more flexion of the thorax in comparison with normal walking.
Conclusion: Texting or reading message on a smart phone while walking may pose an additional risk to pedestrians' safety.

KCI등재

5노인 보행 시 하지 근 활동 양상과 관절의 안정성이 낙상에 미치는 영향 -전향적 연구(Prospective Study)-

저자 : Ji-seon Ryu

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 79-88 (10 pages)

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Objective: The aim of this study was to determine the peak torques of the knee and ankle joint and local stability of the lower extremity's joints, and muscle activation patterns of the lower extremity's muscles between fallers and non-fallers in the elderly women during walking.
Method: Four elderly women (age: 74.5±5.2 yrs.; height: 152.1±5.6 cm; mass: 55.3±5.4 kg; preference walking speed: 1.19±0.06 m/s) who experienced falls within six months since experiment had been conducted (falls group) and thirty-six subjects (74.2±3.09 yrs.; height: 153.6±4.9 cm; mass: 56.7±6.4 kg; preference walking speed: 1.24±0.10 m/s) who had no experience in falls (non-falls group) within this periods participated in this study. They were measured torque peaks of the knee and ankle joint using a Human Norm and while they were walking on a treadmill at their natural pace, kinematic variables and EMG signals were collected with using a 3-D motion capture system and a wireless EMG system, respectively. Lyapunov Exponent (LyE) was determined to observe the dynamic local stability of the lower extremity's joints, and muscles activation and their co-contraction index were also analysed from EMG signals. Hypotheses between falls and non-falls group were tested using paired t-test and Mann-Whitey. Level of significance was set at p<.05.
Results: Local dynamic stability in the adduction-abduction movement of the knee joint was significantly lower in falling group than non-falling group (p<.05).
Conclusion: In conclusion, muscles which act on the abduction-adduction movement of the knee joint need to be strengthened to prevent from potential falls during walking. However, a small number of samples for fallers make it difficult to generalize the results of this study.

KCI등재

6체성감각 처치를 초보자에게 적용한 케틀벨 투암 스윙의 운동역학적 효과 비교: 관절 가동범위와 근활성도를 중심으로

저자 : Yei-chang Back , Young-kwan Kim

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 89-96 (8 pages)

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Objective: The purpose of this study was to investigate biomechanical comparisons of kettlebell two-arm swings after different somatosensory interventions on joint ranges of motion (ROM) and muscle activations.
Method: Fourteen kettelbell novices (age: 22.92±3.23 yrs, mass: 75.75±9.94 kg, height: 172.03± 5.49 cm), consisting of male college students, participated in this study and performed two-arm kettlebell swings in different conditions. Three different somatosensory interventions were the applications of heavy mass kettlebell (20 kg), taping on gluteus muscles, and unstable mat condition. All subjects performed pre-intervention swings and post-intervention swings, respectively. Statistical analysis were performed on results of joint kinematics and electromyographies of major muscles.
Results: Results showed significant increases in ROM of hip and decreases in ROM of shoulder after unstable mat trials. In addition, the application of unstable mat during kettlebell swings induced higher muscle activations in gluteus maximus muscle during only upward phase of two-arm kettlebell swings.
Conclusion: For beginner, the application of unstable surface would increase in hip joint ranges of motion with enhancement of gluteus muscles.

KCI등재

7보행 시 인간 장애물의 동적 · 정적 상태에 따른 충돌회피전략

저자 : Yeon-jong Lee , Joo-nyeon Kim

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 97-104 (8 pages)

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Objective: The aim of this study was to investigate the strategies for avoiding moving and stationary walker using body segments during walking.
Method: Ten healthy young adults (10 males, age: 24.40±0.49 yrs, height: 175.80±5.22 cm, body mass: 70.30±5.22 kg) participated in this study. Each participant was asked to perform a task to avoid collisions with another walker who was moving or stationary during walking on the 10 m walkway. Both walkers were performed at natural self-selected walking speed.
Results: Medio-lateral avoidance displacement of the trunk and the pelvis were significantly increased when avoiding a stationary walker (p<.05). There were no significant differences in medio-lateral center of mass trajectory. Rotation angle of trunk, pelvis and foot on the vertical axis were significantly increased when avoiding a stationary walker (p<.05).
Conclusion: Based on our results, when another walker moves continuously, the walker recognizes another walker as the object of social interaction and performs the avoidance strategies while expecting the cooperative distance. On the other hand, when another walker is stopped, it is determined that the walker has an obligation to avoid, and the walker performs a relatively safer avoidance strategy.

KCI등재

8Effect of Wearing Ankle Weights on Underwater Treadmill Walking

저자 : Que Tae Park , Suk Bum Kim , David O Sullivan

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 105-112 (8 pages)

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Objective: The main purpose of this study was to investigate the effects of wearing an ankle weight belt while performing gait in water by focusing on the effect of using ankle weights have on the gait kinematics and the muscle activities for developing optimum training strategies.
Method: A total of 10 healthy male university students were recruited for the study. Each participant was instructed to perform 3 gait conditions; normal walking over ground, walking in water chest height, and walking in water chest height while using ankle weights. All walking conditions were set at control speed of 4 km/h ± 0.05 km/h. The depth of the swimming pool was at 1.3 m, approximately chest height. The motion capture data was recorded using 6 digital cameras and the EMG was recorded using waterproof Mini Wave. From the motion capture data, the following variables were calculated for analysis; double and single support phase (s), swing phase (s), step length (%height), step rate (m/s), ankle, knee, and hip joint angles (°). From the electromyography the %RVC of the lower limb muscles medial gastrocnemius, rectus femoris, erector spinae, semitendinosus, tibialis anterior, vastus lateralis oblique was calculated.
Results: The results show significant differences between the gait time, and step length between the right and left leg. Additionally, the joint angular velocities and gait velocity were significantly affected by the water resistance. As expected, the use of the ankle weights increased all of the lower leg maximum muscle activities except for the lower back muscle.
Conclusion: In conclusion, the ankle weights can be shown to stimulate more muscle activity during walking in chest height water and therefore, may be useful for rehabilitation purposes.

KCI등재

9보행 시 낙상 유무에 따른 압력중심점의 복잡성 비교

저자 : Sang Kyoon Park , Sihyun Ryu , Jongbin Kim , Sukhoon Yoon , Jiseon Ryu

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 113-119 (7 pages)

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Objective: The purpose of this study was to investigate the effect of the falls on the center of pressure (CoP) complexity during gait using non-linear approximate entropy (ApEn).
Method: 20 elderly women with experience of falling (age = 72.55 ± 5.42 yrs; height = 154.40 ± 4.26 cm; body weight = 57.40 ± 6.21 kg; preferred gait speed = 0.52 ± 0.17 m/s) and 20 elderly women with no experience of falling (age = 71.90 ± 2.90 yrs; height = 155.28 ± 4.73 cm; body weight = 56.70 ± 5.241 kg; preferred gait speed = 0.56 ± 0.13 m/s) were recruited for the study. While they were walking at their preferred gait speed on a treadmill (instrumented dual belt treadmills, Bertec, USA) with a force plate CoP data were collected for the 20 strides. The complexity of the CoP was analyzed using the ApEn technique.
Results: The ApEn of the medial-lateral CoP in the fallers showed smaller about 16% compared to the non-fallers (p<.05). The ApEn of the antero-posterior CoP of the fallers showed smaller about 12% compared to the non-fallers, but the difference was not statistically significant.
Conclusion: Based on the results of this study, the reduction of the medio-lateral CoP complexity in the elderly gait would be an index to determine the potential fall.

KCI등재

10중고등학교 우수 선수의 철봉 Tkatchev 기술의 순간 동작 시점에 관한 운동역학적 연구

저자 : Kyu-chan Lim

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 29권 2호 발행 연도 : 2019 페이지 : pp. 121-128 (8 pages)

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Objective: The aim of this study was to examine the relation between swing phase and airborne phase of Tkatchev motion which was successfully performed with following motion by excellent middle and high school athletes in horizontal bar.
Method: The subjects for this study were 8 male middle and high school top athletes. After their Tkatchev motions were filmed by two digital highspeed camcorders setting in 90 frames/ sec at the 44th National Gymnastics against Cities and Provinces, the % lapse time · lapse time of each instant, inferred maximum force acting on horizontal bar, and other kinematical variables were calculated through DLT method. After the relations among the % lapse times of each instants of downswing-start, downswing-finish, whipswing-finish, release, peak-height, and lapse time of regrasp, the relation among maximum force acting on bar, % lapse time, peak height, and the relation between % lapse time and release height were examined, the biomechanical timing characteristics of Tkatchev motion were as follows.
Results: Firstly, it was revealed that the whole lapse time was 1.62 ± .06 s and the correlation between the % lapse time of downswing-start and % lapse time of release was .819. Secondly, it was revealed that the pattern of COG path was shifted forwardly and tilted 11 clockwise from origin. Thirdly, it was revealed that maximum force acting on bar was inferred in 2,283 ± 425 N (4.7 ± .6 BW) and the correlation between maximum force and peak height was r = .893. Lastly, it was revealed that the horizontal and vertical component of body COG velocity was -2.14 ± .29 m/s, 2.70 ± .43 m/s respectively, release height was .49 ± .12 m, and shoulder angle was 139 ± 5 deg, and that the later the % lapse time of release, the higher the release height (r = .935).
Conclusion: It is desired that the gymnastic athletes should delay the downswing-start near the horizontal plane on 2nd quadrant because the later the % lapse time of downswing, the higher the release height. After all the higher release height could ensure the athletes to regrasp the bar safely, the athletes should exercise to make downswing-start delay.

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