To investigate the anticipatory effect on landing patterns during side-cutting maneuver, thirteen healthy female elite college soccer players participated in this study. Three-dimensional knee kinematics, effective mass and correlation between both these were measured and analyzed using a motion ana...
To investigate the anticipatory effect on landing patterns during side-cutting maneuver, thirteen healthy female elite college soccer players participated in this study. Three-dimensional knee kinematics, effective mass and correlation between both these were measured and analyzed using a motion analysis and force plates. Each testing session included anticipated tasks, $45^{\circ}$ side-cutting tasks (AC), followed by a set of unexpected side-cutting (UC) in a random order. Knee flexion/extension, valgus/varus and internal/external rotation angles and effect mass were compared by using paired t-test. Also, correlation analysis was performed to identify the relationship between knee angles and effective mass. Effective mass during UC was greater than that during AC. Effective mass and maximum knee flexion angle were positively correlated during AC and not during UC. Based on the relationship between effective mass and knee flexion angle in AC, shock absorption can be controlled by knee joint flexion in pre-predicted movement condition. However, effective mass can not be controlled by knee flexion in UC condition. The unexpected load affects were more irregular on the knee joint, which may be one of the injury mechanisms of anterior cruciate ligament (ACL) in female soccer players.
To investigate the anticipatory effect on landing patterns during side-cutting maneuver, thirteen healthy female elite college soccer players participated in this study. Three-dimensional knee kinematics, effective mass and correlation between both these were measured and analyzed using a motion analysis and force plates. Each testing session included anticipated tasks, $45^{\circ}$ side-cutting tasks (AC), followed by a set of unexpected side-cutting (UC) in a random order. Knee flexion/extension, valgus/varus and internal/external rotation angles and effect mass were compared by using paired t-test. Also, correlation analysis was performed to identify the relationship between knee angles and effective mass. Effective mass during UC was greater than that during AC. Effective mass and maximum knee flexion angle were positively correlated during AC and not during UC. Based on the relationship between effective mass and knee flexion angle in AC, shock absorption can be controlled by knee joint flexion in pre-predicted movement condition. However, effective mass can not be controlled by knee flexion in UC condition. The unexpected load affects were more irregular on the knee joint, which may be one of the injury mechanisms of anterior cruciate ligament (ACL) in female soccer players.
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제안 방법
Setting Six cameras, 200Hz Vicon motion analysis system(T-40, Vicon Motion System Limited, Oxford, UK) were synchronized with a force platform(2000Hz, AMTI BP-600900, Advanced Mechanical Technology Inc, Watertown, USA) to obtain kinetic and kinematic data. Vicon system cameras were set up around a third-generation artificial soccer surface(Campo, Allgreen, Korea) with a cryogenic rubber infill and an open polyethylene fiber matrix.
The athletes were required to perform three successful trials for anticipated side cutting (AC) and unanticipated side cutting (UC) maneuvers. Specifically they had to approach the force platform at their maximum speed, step on the force platform with their right foot and change direction to the left 45 °(side-cut) from the line of direction of the approach run and for unanticipated contion, subjects performed left 45 ° (side-cut) or right 45 ° (cross-cut) angle with left and right light indicating signal.
, 2009). To create an unanticipated environment, the athletes triggered, 2m before the force platform by means of a photoelectric cell an LED equipped with left and right light indicating which task to perform. When the left color appeared, the participants executed the side-cutting task; on a right color, they executed the cross-cutting task.
대상 데이터
Thirteen right-leg dominant female elite college soccer players (age 19.2±0.4 years, height 162.5±5.2 cm, weight 55.2±4.4 kg, career 7.5±1.4 years) were recruited for the this study.
데이터처리
. To identify the relationship between knee maximum angles and Mfoot, the correlation analysis was implemented. The SASW 18.
성능/효과
The result of this study suggest that Mfoot showed higher effective mass of foot in UC than the AC, and knee joint load can be explained by the Mfoot in AC. However in UC condition, it was difficult to explain the knee joint load by Mfoot because there were no significant co-relationship between Mfoot and knee maximum angles.
The results of this study suggest that it is appropriate to use different Mfoot for different anticipation conditions: about 1.22 % BM for AC, 1.48 %BM for UC (p=.019). There were significant correlations only between knee joint maximum flexion angles and the magnitude of Mfoot in AC (p=.
후속연구
Future research should focus on the relationship of Mfoot and knee angles especially, how changes in posture moderate impact transient in unanticipated condition.
참고문헌 (12)
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