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      • KCI등재후보

        제자리 한 발 몸펴 앞 공중돌기 동작의 운동학적 분석

        안완식,김유길,박형철,김혜영 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1

        이 연구는 Free workover forward 동작의 이상적인 지도방법과 마루와 평균대에서 좀 더 안정적이고 발전되는 기술동작을 배우는 데 기초자료로 제공함에 그 목적을 두었다. 이 연구의 목적을 달성하기 위해서 H대학의 여자 체조 선수 3명을 임의 추출하여 운동학적인 변인을 분석한 결과 다음과 같은 결론을 얻었다. 마루운동에서 제자리 한발 몸펴 앞공중 돌기 동작을 연기하는데 1국면에서 슬관절과 고관절을 빠르게 신전시켜 회전속도를 증가시켜야하고 3국면에서 4국면까지 수직상승 탄력을 이용하여 신체를 높이 투사시켜 회전속도를 빠르게 하며 5국면에서 여유있는 착지를 이루는 자세가 가장 바람직한 동작임을 알 수 있다. This study has been aimed at providing an ideal instructive method of 'Free workover Forward′ motion and basic data for the learning of a more stable, developed, and skilful motions on the floor as well as balance beam. In order to achieve such an aim of this study, three female champions of physical exercise were employed at random from H University as the object for the research and analysis of kinetic variable factors as resulted in as follows. 1. It was learned that the change in the factor of time variance from phase 1 throughout phase 3 should quicken the time consumed and when remaining in the air the rotation force of the moving body should be accelerated in short moment. It was desirable that air-remaining time for the body should be raised by moving reaction of sposeting leg and the swing of kick should be big and quick. 2. When the location of the body center should move quickly the horizontal and vertical locations at phase 2, and the body was projected in the air at phase 3, the hips should be extended, the horizontal location should be small, the vertical location should be big, the height of remaining in the air should be raised so that landing posture could be taken with enough allowance of time due to increased time for remaining in the air. 3. when the body center passed the horizon as the speed variation of the body center at phase 1 throughout phase 3 raised the vertical speed with the application of the vertical speed and the reaction of the knees. It was known that a stable motion was made through the flexion of knees as it made vertical at phase 5 upholding quickly the moving body. 4. change of angles of the articulations yielded the greatest change of angles at the knees at phase 1 throughout phase 3, and before the rotation of the body, the arch posture motion was shown to be desirable to take a stable posture through straightening thy vertical posture by quick rotation force from too much extension of the knees. summarizing the above, in the performance of the motion of stretching the body with one step at the same position and rotating in the air, the rotation speed should be increased at phase 1 by extending rapidly the knees and hips at phase 3 throughout phase 4 the rotation speed should be quickened by projecting highly the body with the application of elasticity in vertical uprising and then forming an allowable landing was desirable at phase 5.

      • KCI등재
      • KCI등재

        Comparative Analysis of Gait Parameters and Symmetry between Preferred Walking Speed and Walking Speed by using the Froude Number

        유시현,김종빈,류지선,윤석훈,박상균 한국운동역학회 2016 한국운동역학회지 Vol.26 No.2

        Objective: The purpose of this study was to investigate differences in gait parameters and symmetry between walking speed by using the Froude number and preferred walking speed. Method: Fifty adults (age: 21.0 ± 1.7 years, body weight: 71.0 ± 9.2 kg, height: 1.75 ± 0.07 m, leg length: 0.89 ± 0.05 m) participated in this study. Leg length-applied walking speed was calculated by using the Froude number, defined as Fr = v2/gL, where v is the velocity, g is the gravitational acceleration, and L is the leg length. Video data were collected by using eight infrared cameras (Oqus 300, Qualysis, Sweden) and the Qualisys Track Manager software (Qualisys, Sweden), with a 200-Hz sampling frequency during two-speed walking (preferred walking speed [PS] and leg length-applied walking speed [LS]) on a treadmill (Instrumented Treadmill, Bertec, USA). The step length, stride length, support percentage, cadence, lower joint angle, range of motion (ROM), and symmetry index were then calculated by using the Matlab R2009a software. Results: Step and stride lengths were greater in LS than in PS (p < 0.05). The right single-support percentage was greater in LS than in PS (p < 0.05). The hip joint angle at heel contact and toe-off were greater in LS than in PS (p < 0.05). The hip and knee joint ROM were greater in LS than in PS (p < 0.05). Conclusion: Based on our findings, we suggest that increased walking speed had a significant effect on step length, stride length, support percentage, and lower joint ROM. Objective: The purpose of this study was to investigate differences in gait parameters and symmetry between walking speed by using the Froude number and preferred walking speed. Method: Fifty adults (age: 21.0 ± 1.7 years, body weight: 71.0 ± 9.2 kg, height: 1.75 ± 0.07 m, leg length: 0.89 ± 0.05 m) participated in this study. Leg length-applied walking speed was calculated by using the Froude number, defined as Fr = v2/gL, where v is the velocity, g is the gravitational acceleration, and L is the leg length. Video data were collected by using eight infrared cameras (Oqus 300, Qualysis, Sweden) and the Qualisys Track Manager software (Qualisys, Sweden), with a 200-Hz sampling frequency during two-speed walking (preferred walking speed [PS] and leg length-applied walking speed [LS]) on a treadmill (Instrumented Treadmill, Bertec, USA). The step length, stride length, support percentage, cadence, lower joint angle, range of motion (ROM), and symmetry index were then calculated by using the Matlab R2009a software. Results: Step and stride lengths were greater in LS than in PS (p < 0.05). The right single-support percentage was greater in LS than in PS (p < 0.05). The hip joint angle at heel contact and toe-off were greater in LS than in PS (p < 0.05). The hip and knee joint ROM were greater in LS than in PS (p < 0.05). Conclusion: Based on our findings, we suggest that increased walking speed had a significant effect on step length, stride length, support percentage, and lower joint ROM.

      • KCI등재

        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.

      • KCI등재
      • KCI등재
      • KCI등재

        골프 드라이브 스윙 시 압축 밴드를 적용한 기능성 의류가 신체의 운동역학적 변인에 미치는 영향

        채원식 ( Woen Sik Chae ),강년주 ( Nyeon Ju Kang ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.3

        The purpose of this study was to determine how spandex wear with compressive band affects biomechanical parameters during a golf swing. Nine male golf players, each with at least 6 years golf experienc(handy 4.5±5.4), were recruited as the participants. Eight pairs of surface electrodes were attached to the left and right side of the body to monitor the pectoralis major(PM), external abdominal oblique(AO), erector spinae(ES), and vastus lateralis(VL). This study showed that the angular velocity of the club in EG were increased during the down swing phase but X-Factor and X-factor Stretch were reduced. Average and maximum nEMG (normalized EMG) values of the left AO(external abdominal oblique) were less in EG(experimental group) compared with CG(control group) during the back swing, whereas those of left PM(pectoralis major) in EG were greater than CG. It is more likely that EG performed effectively golf swing without excess muscle activity. Thus, the spandex wear with compressive band played an important role in improving swing performance with injury prevention. This has led to suggestions of the need for further kinetic and kinematic analyses to evaluate its function.

      • KCI등재

        미끄럼방지 노인화에 대한 생체역학적 분석

        이은영 ( Eun Young Lee ),손지훈 ( Jee Hoon Sohn ),양정훈 ( Jeong Hoon Yang ),이기광 ( Ki Kwang Lee ),곽창수 ( Chang Soo Kwak ) 한국운동역학회 2013 한국운동역학회지 Vol.23 No.4

        Fall is very fatal accident causes death to older people. Shoe may affect to fall. Shoe influences risk of slips, trips, and falls by altering somatosensory feedback to the foot. The purpose of this study was to investigate the analysis of non-slip shoes for older people and influence on older people`s lower extremity. For this study twenty three healthy older people were recruited. Each subjects walked over slippery surfaces (COF 0.08). Four pairs of non-slip shoes (shoe A had the greatest COF, 0.23 while shoe B, C, and D had smaller COF relatively) for older people were selected and tested mechanical and biomechanical experiment. For data collection motion capture and ground reaction forces were synchronized. There were statistically significant differences for slip-displacement, coefficient of friction, braking force, propulsion force, knee range of motion and knee joint stiffness by shoes. It was concluded that shoe A was the best for non-slip function because of the lowest slip displacement, the highest braking and propulsion forces, and the highest mechanical and biomechanical coefficient of friction where as shoe B, C, D were identified as a negative effect on the knee joint than shoe A. To prevent fall and slip, older people have to take a appropriate non-slip shoes such as shoe A.

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