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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
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Volume & Issues
Volume 19, Issue 4 - Dec 2009
Volume 19, Issue 3 - Sep 2009
Volume 19, Issue 2 - Jun 2009
Volume 19, Issue 1 - Mar 2009
Selecting the target year
Kinematical Analysis of Fastball and Longtoss during Baseball Throwing
Woo, Byung-Hoon ; Jung, Yun-Jin ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 425~433
DOI : 10.5103/KJSB.2009.19.3.425
The purpose of this study was to investigate relation between fastball motion and longtoss motion, and the kinematical analysis using APAS(Ariel Performance Analysis System). Eight people(age:
) participated in the experiment. Followings are the conclusion. In displacement of fore-aft on COG(Center of Gravity), fastball motion moved more forward than longtoss motion. In displacement of vertical on COG(Center of Gravity), fastball motion was lower than longtoss motion In velocity of right hand, greater release velocity was measured for fastball motion than for longtoss motion. In displacement of elbow and shoulder joint, more extended displacement was exhibited in fastball motion than longtoss motion. In displacement of trunk tilt, fastball motion showed foreward tilt, longtoss motion showed backward tilt. In stride, fastball showed longer than longtoss.
Kinematic Analysis of Lower Extremities during Stairs and Ramp Climbing with Older Adults
Han, Jin-Tae ; HwangBo, Gak ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 435~448
DOI : 10.5103/KJSB.2009.19.3.435
The purpose of this study was to investigate the kinemaitc gait parameter of lower extremities with different gait conditions(level walking, stairs, ramp) in old adults. Fourteen healthy older adults participated in this study and kinematic data were measured using 3D motion analysis system(Vicon, Oxford Metrics, England). Statistical analysis was used one-way ANOVA to know the difference of lower extremities angle at each gait phase with a different gait conditions. In sagittal plane, pelvic anterior tilt increased in stairs and ramp climbing and hip and knee flexion increased in stairs climbing but ankle dorsiflexion increased in ramp climbing. In frontal plane, pelvic was up in stairs and hip abduction and adduction more changed in stairs climbing than level walking. Knee varus and ankle inversion increased in stair climbing. In horizontal plane, pelvic internal rotation increased in stairs and ramp climbing and knee internal rotation increased in stairs climbing but ankle external rotation increased in stairs climbing. This results was shown that the stairs and ramp climbing changed the kinematic gait parameters of lower extremities in healthy old adults.
Analysis of Ground Reaction Force by Stance Type during Tennis Forehand Stroke
Kang, Yong-Teak ; Seo, Kook-Eun ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 449~455
DOI : 10.5103/KJSB.2009.19.3.449
The purpose of this study was to analyze the kinetics variables of GRF by dtance type during forehand stroke. Eight high school tennis players, who have never been injured for last six months, in Busan were chosen for the study. They performed horizontal swing and vertical swing that it was done each five consecutive trial in the condition of square, semi-open and open stance. It was filmed by 6 video camera and used with 3-dimensional motion analyzer system and GRF system. The following kinetic variables were analyzed in relation to left leg and right leg GRF. The conclusion were as follow: 1. In square and semi-open stances, the horizontal ground reaction force was decreased at impact in left leg regardless of swing type, whereas open stance was increased at impact to the tiptoe in both legs. 2. In square and semi-open stances, the vertical ground reaction force was increased at impact in left leg regardless of swing types, whereas open stance was decreased at impact to vertical direction in both legs.
The Kinetic Analysis of Arabesque Turn Motion in Modern Dance by Upper Extremity Usage
Park, Yang-Sun ; Kim, Ji-Hye ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 457~466
DOI : 10.5103/KJSB.2009.19.3.457
This study puts the purpose in providing the scientific basis of dance motion as an artistic expression by analyzing the kinematic variable and the distribution factor of power affecting the motion, which is connected to the turn, right after the arabesque motion according to the existence and non existence of using the arm in the arabesque motion of modern dance. As a result of this study, arabesque turn motion, not using the upper limbs, used more turning force of head and body than the arabesque turn motion, using the upper limbs, and arabesque turn using the upper limbs obtained the turning force, using the right shoulder. The range of the hip joint on the left and the position change of left tiptoe in the Arabesque turn motion using the upper limbs is largely ascended to the vertical axis, while, the position of tiptoe in the Arabesque turn motion, not using the upper limbs is dropped to the lower part of each event. In the replacement of body center, Arabesque turn motion using the upper limbs is moved more to the turning axis than arabesque turn motion not using the upper limbs. As a result of maximum vertical ground reaction force, Arabesque turn motion using the upper limbs appeared to be a lower value than the Arabesque turn motion not using the upper limbs.
Kinematic Analysis of Horse-Riding Posture According to Skill Levels during Rising Trot with JeJu-horse
Oh, Woon-Yong ; Ryew, Che-Cheong ; Kim, Jin-Hyun ; Hyun, Sung-Hyun ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 467~479
DOI : 10.5103/KJSB.2009.19.3.467
The purpose of this study was to present the quantitative data which riders can utilize teaching field by comparison analysis of kinematics according to skill level of rider during 2 strides rising trot with the JeJu's-Horse. Participated subjects was consisted of total 10 riders(unskilled: n=5, skilled: n=5). The method of experiment & analysis was based on 3D cinematography. Variables were consisted of temporal, linear & angular kinematics by each event & phase. The skilled assigned more ratio of elapsed time in air than support phase, had the less range of motion in up-down direction and more consistent velocity in lateral & forward direction and performed periodic up-down movement with alignment in vertical direction according to elapsing of phases. The skilled more flexed at elbow and extended backwardly according to elapsing of phases, while more flexed forwardly at hip & knee and plantarflexion at ankle. The skilled postured backward extension but the unskilled do forward flexion. That is, It was considered that the unskilled continued more unstable posture than the skilled during 2 strides in rising trot.
Kinematic Analysis of a Scoop Motion in Elite Male Hockey Players
Lim, Jung-Woo ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 481~488
DOI : 10.5103/KJSB.2009.19.3.481
The purpose of this study was to investigate the hokey scoop motion of elite male hockey players. To accomplish the goal of this study, eight male hockey players participated and were divided into two groups (superior group Vs. inferior group). To find differences between groups, a three-dimensional motion analysis was performed with seven infrared cameras (SF: 200Hz). After analyzed their scoop motion, followings were found. 1) The non-significant(p>.05) increase in anterior CG displacement and velocities were found in superior group compare with inferior group) 2) There were no significance found in anterior-posterior stick velocities between groups. However, significant (p<.05) increase in vertical stick velocities were found in superior group than inferior group indicating the superior group has more skilled in scooping. 3) The significant(p<.05) increase in adductional and internal rotational stick released velocities were found in superior group than inferior group.
Biomechanical Comparison of Good and Bad Performances within Individual in Maximum Vertical Jump
Kim, Yong-Woon ; Kim, Yong-Jae ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 489~497
DOI : 10.5103/KJSB.2009.19.3.489
The purpose of this study was to find differences of jumping performances within individual and to identify the influencing factors in these differences. 20 male subjects performed 6 maximal vertical jumps. The best(GP) & worst(BP) performance of each subject based on their jump height were compared in further analysis. There was a significant difference of approx. 10% in the jump height between GP and BP, which resulted from height of COM and vertical velocity at the instant of take-off. We could observe a significantly higher ankle moment in the GB more than the BP but no significant differences for the knee and hip joint. Also the maximum power of ankle joints in the GP were significantly higher than that in the BP. According to the results, the mechanical output of knee and hip joint are not as influential as that of ankle joint for difference of performance within individual. In conclusion, the results showed that mechanical output of the ankle joint could be more influential factors on the performances within individual although the knee and hip joint play an important role in the vertical jump. We therefore propose that more emphasis should be placed on the potentiation of the ankle joint for the training of the maximum vertical jump.
A Comparision of Flick Shooting Motion in Penalty Corner between High School and National Players in Field Hockey
Kim, Ho-Mook ; Woo, Sang-Yeon ; Kim, Ki-Un ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 499~508
DOI : 10.5103/KJSB.2009.19.3.499
The purpose of this study was to compare and analyze flick shooting motion in penalty corner between high school players and national players in field hockey. Five high school players and six national players participated in this study. The 3D kinematic data were collected for each subject performing the penalty corner stroke. The results of the study were as follows: 1) The national players had higher stick head and ball velocity than the high school players. 2) The forward length between ball and support foot during ball catching with stick head was longer in the national players than the high school players. 3) At the Z axis of the E5 event, the center of gravity of the national players was lower than that of the high school players. 4) At the Z axis of the E5 event, left hip angle of the national players was lower than that of the high school players. 5) The national players had longer drag length of ball than the high school players. 6) The national players had higher hand and lower arm angular momentum than the high school players.
The Kinematical Analysis between the Skilled and the Unskilled for Air Pistol Shooting Posture
Kim, You-Mi ; Kim, Kab-Sun ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 509~517
DOI : 10.5103/KJSB.2009.19.3.509
The purpose of this study was to investigate the effective posture for air pistol shooting. Participants were 3 male athletes of shooting with at least five years of experience and another group of 3 males athletes with less than three years of experience. For the purpose, the shooting motion was analysed using three dimensional image technology. Data from each event for the two groups, competent and less competent ones, were compared to see the differences from the kinematical point of view. Time of period in competent group was longer than less competent group during the shooting posture. Displacement of center of mass and pistol about medial/lateral and antero/posterior in competent group was little than less competent group from aim to shooting. And these result were effect to the velocity. Distance and time in competent group within coaching machine were smaller than less competent group. To the result, it was appear that precision of aim in competent group was higher than less competent group.
The Effects of Ankle Taping on Ankle Angular Velocity, Ground Reaction Force and Postural Stability during Jump Landing on Athlete with Functional Ankle Instability
Kim, Kyoung-Hun ; Cho, Joon-Heang ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 519~528
DOI : 10.5103/KJSB.2009.19.3.519
The effects of taping on the use of such measures for prevention have already been comprehensively described in the literature. However, few studies have analyzed ground reaction forces and postural stability with functional ankle instability subject during dynamic activities with ankle taping The purpose of this study was to identify the effects of ankle taping on ground reaction force and postural stability during jump landing. Fourteen players who has ankle instability were participated in this study. we used vicon and force platform. The application of taping who has ankle instability decreased DF and inversion angular velocity and peak vertical ground reaction force during landing. It also improved A-P cop, M-L cop in stability. The findings of this study support the use of taping as part of injury prevention for subject with functional ankle instability in clinical setting.
Study of Correlation between BBS, SPPB, TUG and COP during Quiet Standing in Elderly Women
Lee, Kyung-Soon ; Kang, Young-Teak ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 529~538
DOI : 10.5103/KJSB.2009.19.3.529
The purpose of this study was to investigate correlation between BBS(Berg balance scale), SPPB(short physical performance battery,) TUG(timed up and go) and COP(center of pressure) during quiet standing in elderly women. Ten elderly women aged 65 to 75 years participated in this study. Subjects were measured physical functional test and they were stood in quiet stance on force platform positioned in one of three different fixed positions(flat, downward, upward). The COP range and mean velocity data were calculated using an experimental setup with the ground reaction force system. COP range and mean velocity of AP direction showed significant more expanded than ML direction of all slope types. Physical performance scores were significant correlated between COP range and mean velocity according to surface slopes. After all elderly women get high score of physical performance that brought decreased on one's COP range and mean velocity. This study suggests that clinical therapist have application to COP parameters as well as BBS, SPPB, TUG of balance assessment in elderly women.
The Characteristics of Obstacle Gaits in Female Elders after 12 Weeks of an Aquatic Exercise Program
Kim, Suk-Bum ; Yu, Yeon-Joo ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 539~547
DOI : 10.5103/KJSB.2009.19.3.539
The purpose of this study was to investigate the changes of kinetic and kinematic parameters in obstacle gaits after 12 weeks of an aquatic exercise program. Eight female elders walked in four different heights of obstacles(0, 2.5, 5.1, & 15.2cm) on their self-selected speed. The ROM of hip was significantly increased after the aquatic exercise program. Swing and Stance duration were decreased. The step length was significantly increased and the step width was decreased. After the exercise program the clearance between the right foot and the top of obstacle(except 15.2cm) increased and the crossing speed was increased. The braking force, propulsive force, braking impulse, and propulsive impulse were significantly changed after the aquatic exercise program. The 12 weeks of the aquatic exercise program resulted in lower body strength and balance gains in female elders. The improvements were associated with changes in kinetic and kinematic parameters leading to an obstacle-crossing speed and a safer lower-limb control. The aquatic exercise program is suggested as an effective intervention to promote gait ability and prevent fall-related to the injuries.
The Effect of Atrophy of the Inpraspinatus on Strength and ROM in Shoulder Joint of Male Volleyball Players
Lee, Byoung-Kwon ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 549~555
DOI : 10.5103/KJSB.2009.19.3.549
The purpose of this study was to quantify the isokinetic peak torque and range of motion at the shoulder in 8 national male volleyball players who played during the 2008 professional leagues. In this study the strength and range of motion data in the internal rotation(IR) and external rotation(ER) of shoulder joint were measured with isokinetic measurement system(Biodex Inc) and motion analysis system (Simi motion system Inc.) from 3 volleyball players with atrophy of the infrasupinatus and 5 volleyball players without atrophy of the infraspinatus. Peak torques were determined using isokinetic measurement on the shoulder joint rotator at the point of angular velocities of
/s. Significant difference was found in the peak torque, IR / ER ratio and the range of motion through assessment of the dominant shoulder between two groups. we recommended functional exercises that improve both external rotators strength and stretching exercise for internal rotation in the dominant side during the prevention programs in volleyball players.
Gender Differences in Electromyography of the Lower Extremity during Golf Driver Swing
Kim, So-Yoon ; Lee, Joong-Sook ; Yang, Jeong-Ok ; Rhee, Sang-Don ; Kim, Young-Soo ; Lee, Bom-Jin ; Kim, In-Hyung ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 557~566
DOI : 10.5103/KJSB.2009.19.3.557
This study was to investigate gender differences in muscle activities on tibialis anterior muscle, gastrocnemius and vastus medialis obliqus and outside and prime mover, antagonist and assistance mover during golf drive swing by electromyography. Ten healthy professional golfers (KPGA(n)=5, KLPGA(n)=5) volunteered in this experiment. All statistical analyses were performed using SPSS. Statistical differences were assess using t-test (p<.05). The conclusion of this study was as following. Muscle dislocation of differences, according to gender, was the highest in case of males in right side of gastrocnemius with the section from the address to the backswing of top and was the highest in case of females in tibialis anterior muscle. Results also show that prime mover was left side of low muscle in case of male with all the sections and situations and is right side low muscle in case of female. These results were significant differences. In case of males, it was though that primer mover was left side of tibialis anterior muscle with moving weight from backswing of top till the address section. In case of females, primer movers were right side of vastus medialis obliqus and tibialis anterior muscle with pushing action form the right knee to the left knee. Therefore, if they try to do the training be able to development right side of vastus medialis obliqus and tibialis anterior muscle in case of females and left side of vastus medialis obliqus and tibialis anterior muscle in case of males, it is consider that golfers' distance and direction will get better.
The Effects of 8 Week Combined Exercise Program on the Biomechanical Function Recovery of Patients Suffering from Work-Related Back Problems
Kim, Do-Hyung ; Lee, Kyung-Il ; Jung, Jin-Yung ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 567~580
DOI : 10.5103/KJSB.2009.19.3.567
The purpose of this study was to find out how the combined exercise program has an influence on the physical recovery of the patients suffering from work-related back problems. Research objects consist of 43 patients suffering from back problems due to workplace accidents. The result of the study shows that the combined exercise program increased muscular strength and endurance significantly and worked positively in lumbar recovery of the patients. It also increased the lowered flexibility caused by back pain to the level of normal state. In addition, the program was effective on the correction of the bad pose of body and scoliosis. Moreover, it helped improve on lifting, social life and reduce in the duration and the frequency of outbreak of pain. Finally, according to the result of this study, the combined exercise program was shown to be effective and appropriate for the patients suffering from work-related back problems.
Kinetic Differences between Normal-design Running Shoes and Spring-loaded Running Shoes
Lee, Chong-Hoon ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 581~592
DOI : 10.5103/KJSB.2009.19.3.581
The purpose of this study is to examine the effect of the functional shoes through the kinetic comparison of normal-design running shoes and spring-loaded running shoes. For this, 12 healthy females from the age from 30 to 40 years participated in the EMG and ground reaction force experiment with testing kinetic variables. 12 subjects walked at the velocity of 1.7m/s. After analyzing variables in the spring-loaded running shoes and normal-design running shoes, the following conclusions were obtained; For the ground reaction force, spring-loaded running shoes have larger antero-posterior GRF than normal-design running shoes in the first and second apexes of antero-posterior ground reaction force. For the analysis of EMG, spring-loaded running shoes showed the higher muscle activation of rectus femoris muscle than norma-design running shoes. So the spring-loaded running shoes help improvement muscle strength of knee extensor.
The Temporal Coordination of the Lower Extremity by Increasing High-heel Height during Walking
Ryu, Ji-Seon ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 593~601
DOI : 10.5103/KJSB.2009.19.3.593
The goal of this study was to investigate the lower extremity's coordination determined by temporal relations with increasing high-heel (3, 7, 9cm) while walking on a treadmill. Twelve healthy women who walked on a treadmill under three conditionswearing 3cm high-heel shoes, 7cm, and 9cm-while kinematic data were collected using a six-cameras (240Hz) Qualisys ProReflex System. From these data, knee flexion, tibia internal rotation, and foot eversion were calculated in Euler technique and found the time for occurring the maximum angle of these movements. The maximum angle of these movements occurred almost simultaneously in 3cm high-heel walking, but not in 7cm and 9cm. The ratio of time for maximum angle of the foot eversion to tibia internal rotation converged to 1 in 3cm high-heel walking, but were less than 1 in 7cm and 9cm. In conclusion, it was indicated that 3cm high-heel walking had better the lower extremity's coordination compared with 7, 9cm high-heel walking.
Effects of Wearing Spandex Pants on Impact Forces and Muscle Activities during Drop Landing
Chae, Woen-Sik ; Kang, Nyeon-Ju ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 603~610
DOI : 10.5103/KJSB.2009.19.3.603
The purpose of this study was to determine how spandex pants affect impact force and muscle activities in the lower extremity. Seven pairs of surface electrodes were attached to the right-hand side of the body. Paired t-test was performed to test if significant difference exist between two conditions(p< .05). The average IEMG activities in the TA, BF, and GM during the landing phase reduced significantly with spandex pants compared to regular pants. All peak IEMG activities except the RF in wearing spandex pants group were significantly greater than the corresponding values in wearing regular pants one. The greater muscle activity recorded in wearing spandex pants can be attributed to the greater motor unit recruitment needed to decelerate and stabilized their bodies. Impact force and loading rate were not significantly decreased with wearing spandex pants. Since the spandex pants used in this study were not custom-fit based on girth of each participants thigh and shank, compression and elasticity for the pants could not be optimized.
Development of Grip Strength Training and Evaluation System of Hand Functions
Kang, Han-Su ; Chung, Sung-Taek ;
Korean Journal of Sport Biomechanics, volume 19, issue 3, 2009, Pages 611~617
DOI : 10.5103/KJSB.2009.19.3.611
The primary purpose of this study was to analysis quantitatively the degree of injury and/or the progress of treatment for physical impairment. This study provided a more detailed study that evaluates all test parameters including maximum grip strength, duration of operation, average grip strength, acceleration work, dynamic endurance time and percent change in static endurance. Also, a complete database management system is developed and used to store related training, evaluation, and personal information. In addition, the system is developed a grip sensor using load.cell transducer (
). The system will be efficient to operate and convenient to use, furthermore, it can be helped for understanding and analysis the progress of a patient during a doctor's rehabilitation program.