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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Sport Biomechanics
Journal Basic Information
Journal DOI :
Korean Society of Sport Biomechanics
Editor in Chief :
Volume & Issues
Volume 18, Issue 4 - Dec 2008
Volume 18, Issue 3 - Sep 2008
Volume 18, Issue 2 - Jun 2008
Volume 18, Issue 1 - Mar 2008
Selecting the target year
Study on Correlation of Outsole Pattern of Sports Shoes and Frictional Coefficient
Lee, Jong-Nyun ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 1~10
DOI : 10.5103/KJSB.2008.18.3.001
One of the major factors affecting maneuverability of an athlete is frictional force caused at an outsole of his shoe. The magnitude of the frictional force is closely related to pattern and hardness of outsole and roughness of ground or floor. This study then focuses on the effect of outsole pattern of sports shoes on the frictional force. After surveying outsole patterns of sports shoes in markets, we select 4 types of outsole patterns, such as straight, W, O, and wave as primary outsole patterns of sports shoe and we also select depth, pitch and slope as design parameters of each pattern. Corresponding to those patterns and design parameters, various outsole specimen are prepared for frictional experiments. After performing frictional tests with those specimen, coefficients of friction(COF) are collected and analyzed with a statistical tool to draw useful conclusion.
An Analysis of Kinematics and EMG for Bandal Chagi in Taekwondo
Ha, Chul-Soo ; Choi, Man-Ho ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 11~21
DOI : 10.5103/KJSB.2008.18.3.011
The purpose of this study was to investigate the most optimum way of performing the bandal chagi during Taekwondo Kyorugi competition. By analyzing the EMG data and the kinematic data it was hoped that scientific data would be provided to instructors and players about the optimization of the Bandal Chagi. The results of the analysis are as follows: During competition while performing the Bandal Chagi the most important factors that affect the impact point are the range of motions of the upper body hyper extension and knee joints. Through the measurement of the muscles EMG activity of a well performed Bandal Chagi with the right leg it was observed that the left side erector spinae muscle was highly activated and so it was concluded that this muscle should be trained to improve the performance of the Bandal Chagi. Likewise it was observed that for the right side of the abdominal muscle's EMG there was a high activity level and thus showed that there was a large contribution of this muscle for the optimum performance of the Bandal Chagi.
Analysis of Proper Sampling Duration in Foot Positions during Assessment of Quiet Stance Balance in the Elderly Women Using Center of Pressure
Shin, Joong-Dal ; Youm, Chang-Hong ; Moon, Dae-Sung ; Kim, Woo-Kyu ; Park, Young-Hoon ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 23~31
DOI : 10.5103/KJSB.2008.18.3.023
The purpose of this study was to investigate proper sampling duration while executing quiet stance of feet together position and a preferred foot position with eyes open using COP variables through GRF system. The subjects participated in this study were twenty healthy elderly women individuals(
years). It represented that the sampling duration needed over 20 s in the FTP and over 60 s in the PFP during assessment of quiet stance. The sampling duration shorter than 20 s in the FTP and 60 s in the PFP may not provide the sample showing stability. Inversely if the sampling duration becomes longer, it can distort the sample showing stability. In the future, I expect more studies of the proper sampling duration through various groups and the study of characteristics of participants caused by more sampling duration.
Kinematical Analysis of Side Kick Motion in Taekwon Aerobics
Yoo, Sil ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 33~42
DOI : 10.5103/KJSB.2008.18.3.033
The purpose of this study was to analyze kinematic variables during Side kick motion in Taekwon Aerobics. The subjects of this study were the 7 skilled and 7 unskilled female college students. A QTM and an Auto Track were used to acquire raw data. The sampling rates camera was 100 Hz. The parameters were calculated and analyzed with Visual3D and SPSS 12.0. The results were as following; 1. In the elapsed time, there was no significance difference statically between a skilled and unskilled group. 2. In the cases of knee angle, there was significant difference statically at Maximum Knee Flexion2(p=0.046, F=4.925). 3. In the cases of knee angular velocity, there was significant difference statically at Maximum Knee Flexion1(p=0.031, F=5.940). 4. In the flexion/extension of hip angle, there was significant difference statically at Maximum Knee Flexion2(p=0.012, F=8.668). 5. In the abduction/adduction of hip angular velocity, there was significant difference statically at Minimum Knee Flexion (p=0.019, F=7.324). 6. In the external rotation/internal rotation of hip angular velocity, there was significant difference statically Minimum Knee Flexion(p=0.005, F=11.87).
Kinematic Analysis of Swing of Golfer on Professional Golf Tour
Lim, Jung ; Na, Sung-Hoon ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 43~80
DOI : 10.5103/KJSB.2008.18.3.043
The purpose of this research is to analysis the swing of driver used by professional golfers during on-season. In order to collect on-season driver swings of research objects, which are three KPGA(Korean Professional Golfer Association) professional golfers, measurements were carried out right after the last game of a season. The analysis range was set to down-swing point while analysis was conducted to after-impact, release point. As a result, systematic process between leading segments of the previous precise kinematic analysis research seems to turn up the same. However, there were different results compared to the preceding research. All three testers expressed adduction of left hand which could not be described with forming cocking angle, in consequence, adduction of left hand does not have a big effect on formation of cocking. Moreover, chest movement right before the impact; which was emphasized in previous research, the direction was not opposite but the same with the ball.
The Kinematics Analysis of Abscission Handicap Wheelchair Table Tennis
Moon, Gun-Pill ; Lim, Jung ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 51~59
DOI : 10.5103/KJSB.2008.18.3.051
The objective of this study is to kinematically analyze forehand & backhand strokes of abscission handicap wheelchair table tennis athletes. The participant of this study were picked out of national athletes who have abscission handicap. Forehand stroke movement was expected to show a throw like motion. However, external rotation and internal rotation of the right arm created a backswing and an impact. Backhand stroke was expected to show a push like motion, and as expected, proximal part of the body didn't participate in the stroke motion, but the distal part, the right arm, rotated internally to backswing and external rotated to impact to form a push like motion. Forehand swing was expected to show throw like motion according to the Link Segmental System principle. However, abscission handicap athlete didn't show clear linking structure connecting proximal and distal parts. Successful strokes were dependant only on the angle of arm rotation.
Kinetic Analysis of the Salto Side-Ward Tucked on the Balance Beam
Yeo, Hong-Chal ; Chang, Jae-Kwan ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 61~69
DOI : 10.5103/KJSB.2008.18.3.061
The purpose of this study is to examine the success or failure on the balance beam in element group requirements posture which is bending salto side-ward tucked through kinetic analysis. The national team players were participated. The goal was to present training methods to coaches and athletes so as to provide scientifically useful information. The results from this study were summarized as below. When the performance was successful, the features of the body's center of gravity during the side somersault motion showed to spread from the center of the balance beam and the center of the gravity moved to the direction of the body's rotation. In the spring sections - event2 and 3, when the performance was successful, up/down fluctuation became more wider and increased air time. It supported the result that the projecting variable was higher than in failure trial. In addition, the right side hip joint angles and speed, and angular velocity as jumping up for a leap were larger than in failure trial. Those variables showed the optimal conditions for a leap. By increasing the speed of the upper limb from the shoulder and the speed of the shoulder joint angular velocity, the momentum was increased. Especially the right side shoulder joint angular velocity increased dramatically because the right leg was held. As to the side somersault motion, the angular momentum of successful trial with respect to x-axis was bigger than failed trial. It indicated that the increasing angular momentum with respect to x-axis was an important factor in flying motion. Besides, as to side somersault, the appropriate proportion of angular momentum with respect to y-axis and z-axis was a key to successful trails.
Ground Reaction Force Characteristics During Forward and Backward Walking Over 20 Degree Ramp
Chae, Woen-Sik ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 71~82
DOI : 10.5103/KJSB.2008.18.3.071
The purpose of this study was to compare GRF characteristics during forward and backward walking over 20 degree ramp. Temporal parameters, GRFs, displacement of center of pressure (DCP), and loading and decay rates were determined for each trial. The results showed that the vertical GRF in BD during RTO was significantly greater than those found in FU. This reults indicated that GRF patterns may be changed by different walking conditions and altering position of ankle, knee, and center of mass throughout the walking cycle. The DCP during
-LHC in antero-posterior direction for downward was smaller than the corresponding value for upward condition. It' seems that the ankle and knee joints are locked in an awkward fashion at the toe contact to compensate for imbalance. Reducing the magnitude of loading rate can be achieved by walking in the backward direction. Accordingly, the results can be a benefit if one is suffering from an impact-type injury.
Mechanical Properties of Unilateral & Bilateral Movement in Isokinetic Knee Extension and Flexion
Kim, Yong-Woon ; Kim, Yong-Jae ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 83~92
DOI : 10.5103/KJSB.2008.18.3.083
The purpose of this study was to examine the mechanical properties and patterns of bilateral and unilateral movement under varying velocities and movement patterns. The unilateral and bilateral isokinetic knee extension and flexion were taken for three speeds of 13 healthy male subjects. Although there was bilateral facilitation at the speed of
/s for the bilateral movement of knee extension, as a whole there was less resultant torque and power of bilateral movement than summed unilateral under knee flexion and extension of 3 velocity condition. There was significant correlations between bilateral deficits within individuals observed for an the same movement(
extension), which means that same agonist was recruited. On the contrary, although there was a tendency of a similar pattern of the individuals bilateral deficit according to the varying velocities, there was not a significant correlations between bilateral deficits of flexion and extension within individual, which means that different agonist was recruited. With the analyses of this results the individuals neuromuscular characteristics and the effecting factors for bilateral movement can be speculated upon.
A Kinematical Comparative Study on Crouching Starts According to the Position Blocks in Race
Choi, Su-Nam ; Oh, Cheong-Hwan ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 93~105
DOI : 10.5103/KJSB.2008.18.3.093
This study was for the analysis of Kinematic variables, using 3 types of starting block position setting(25cm, 40cm, 35cm). The subjects of the study were 8 short-distance male runners. In the study, the most desirable block setting type for the runner who were average 180cm tall to get the good record was 45cm (distance between the starting line and the front block) and 40cm (distance between the blocks). In conclusion, the most favorable start in 100m race was to get the strongest propelling power at the start line. The most important technical point was quick responding ability to the start signal and reaching the maximum speed at the shortest time through the strong kick using the front leaning body angle and gravity. Type B start method has shown the most effective results for the improvement of the records in the 100m race.
A Comparison Analysis of EMG according to Weight Class and Increase Record of Clean and Jerk Techniques Weightlifting in High School Female Weight Lifters
Park, Il-Bong ; Yeo, Nam-Hwoeh ; Kim, Jung-Tae ;
Korean Journal of Sport Biomechanics, volume 18, issue 3, 2008, Pages 105~114
DOI : 10.5103/KJSB.2008.18.3.105
The purpose of this study was to compare of muscles in clean and jerk techniques between 69kg class(n=3), 58kg class(n=3) in high school female weight lifters using EMG(electromyographic) system. EMG analysis were executed on 6 major muscles and dividing clean and jerk techniques into 6 phases. In that result, in the difference by weight, it was shown that EMG value increased gradually as the weight is raised of all muscles group & phases in 58kg class. In EMG signal scale by classes, it was shown that EMG signal scale didn't increase according to class & weight. In the result of this study, that EMG value was inconsistent in 69kg class is showing that the consideration of the technical factor together with muscle power has positive affect more on the performance improvement in the heavy class.