This study conducted the kinetic comparison and analysis of smash and drop motions in women players of college badminton teams by dividing motions into straight and cross ones. For the comparison and analysis of smash and drop motions, data on swing t...
This study conducted the kinetic comparison and analysis of smash and drop motions in women players of college badminton teams by dividing motions into straight and cross ones. For the comparison and analysis of smash and drop motions, data on swing time, the displacement and velocity in the gravity center of the human body, racket head velocity, lean angle and angular velocity, angle and angular velocity of trunk rotation, angle and angular velocity of a shoulder joint, angle and angular velocity of an elbow joint, angle and angular velocity of a wrist joint, and the displacement of ground reaction force(GRF) was calculated and became coordinated. Finally, ANOVA was conducted to examine a statistically significant difference.
In order to achieve this purpose, the phases and sections of smash and drop motions were kinetically analyzed through 3D image analysis in women badminton players.
Through the image analysis of phases and sections of smash and drop motions, the following results were obtained.
1. The necessary time of swing showed a statistically significant difference in the P2 phase(the back swing point - the impact point) according to the direction of smash and drop motions.
2. The displacement in the gravity center of the human body was moved into posterior and right directions in P1, but the movement became small and was made in the same place in P2. The displacement in the gravity center of the human body showed no statistically significant difference according to the stroke direction.
3. The velocity in the gravity center of the human body showed no big change from E1 to E3 and showed (-) in P1 and (+) in P2. However, the velocity in the gravity center of the human body showed no statistically significant difference according to the stroke direction. The smash stroke was larger in the racket head velocity than the drop stroke. Also the smash stroke showed larger racket head velocity than the drop stroke in E2 and E3 and there was a significant difference according to the stroke direction. The smash stroke was larger in the change of racket head velocity than the drop stroke in P1 and P2, but there was a statistically significant difference only in P1.
4. The lean angle of trunk was found lager in the cross stroke compared with the straight stroke and there was a statistically significant difference in E2 and E3. Although the angle of trunk rotation was found larger in the drop stroke compared with the smash stroke, there was no statistically significant difference. Although the angle of a shoulder joint was found larger in the cross course compared with the straight course in the smash and drop strokes, there was no statistically significant difference. Also, there was no statistically significant difference in an elbow joint. Although the angle of a wrist joint was found larger in the smash stroke compared with the drop stroke in E2 and E3, there was a statistically significant difference only in E2.
5. While the angular velocity of trunk lean showed a statistically significant difference in E3, the impact point, the angular velocity of trunk rotation showed no statistically significant difference. The angular velocity of a shoulder joint was found larger in the smash stroke in E2 which moves toward the impact point and E3, the impact point, compared with the drop stroke and there was a statistically significant difference in E2 and E3. The angular velocity of an elbow joint showed a statistically significant difference in E2 but showed no statistically significant difference in E3, the impact point. However, the angular velocity was found larger in the smash stroke compared with the drop stroke. Although the angular velocity of a wrist angle showed no statistically significant difference, the drop stroke showed a larger angular velocity than the smash stoke in E2 and showed a similar angular velocity to the smash stroke in E3.
6. The size of force component of GRF was found largest in the upper and lower parts, followed by right and left parts and the front and rear parts. Specifically, it was found that the force applied to the ground immediately before the jump was made by obtaining the braking force by right and left GRF rather than the front and rear one. Although there was some difference in GRF component size between strikes, there was no statistically significant difference.
As a result of this study, the following suggestions are made for further study.
This study examined the kinetic variables of smash and drop technique in badminton through 3D image analysis. The results were obtained under the laboratory environment rather than in actual games. Because the study consisted of 5 women players, it had the characteristic of exploratory study. Thus it is necessary to extend analysis subjects. Furthermore, experimental equipment should become diverse to design the study of performance improvement and it is recommended to continue to conduct this kind of study in the future.