Kinematical Analysis Dodgeball Champion among Different Throwing Movements
| Autor: | Chih-Yueh Chen, 陳志岳 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 The aim of study is to analyze the diference between overarm throw and sidearm throw when the kinematics dodgeball players stand still and step in motion. Method: Ten national champion Dodgeball game players in Taiwan were served as the participants of the study. Their average age are11.86±0.54 years. Their average height is 158±9.16 cm; Their average weight is 52.34±17.33 kilograms. Also, ten Vicon Motion Capture systems and one Fastec High Speed Camera are used to be synchronized the data collected in the survey. The VISUAL 3D motion analysis system are utilized to show Kinematics calculation parameters. Calculation of Ball Velocity will be demonstrated by using Kwon 3D software. The variables of the Friedman two-way analysis of variance nonparametric statistical test was calculated by using SPSS 20.0 software to compare with the differences of throwing motion, the significant levels was as α = .05. The results were : 1.overarm throw Motion: the phrase from the ball accelerating to ball released from hand demonstrate a larger angle of lateral trunk tilt, the maximum angular velocity of the front trunk tilt and the largest angle of shoulder abduction. When the ball is released, there will be a greater angular velocity of forefoot knee joint and shoulder axis angle would tend toward non-dominant hand of the player. 2.Sidearm throw Motion: in the phase of acceleration, the Maximum trunk rotation angular velocity becomes greater. When the ball is released, there will be greater COM velocity and upward of velocity. And, the shoulder axis angle tends toward the front of the player. 3.Overarm throw with stepping in motion: the phrase from the ball accelerating to ball released from hand demonstrate a larger angle of lateral trunk tilt, the maximum angular velocity of the front trunk tilt and the largest angle of shoulder abduction. When the ball is released, there will be a greater angular velocity of forefoot knee joint and shoulder axis angle would tend toward non-dominant hand of the player. 4.Sidearm throw with stepping in motion: In the phrase of preparation, the player might have a longer percentage of the strike length; in the phase of acceleration, the player might have a larger displacement of the whole gravity and displacement in the direction of moving forwards. The trunk rotation angular velocity also becomes greater. When the ball is released, there will be a greater velocity of COM upward and angular velocity of shoulder internal rotation. Suggestions: As for the sports performance, sidearm throw with stepping in motion leads to the faster ball Velocity, the player who steps in motion has a longer time to control the ball; as for the risk of injury, the larger trunk lateral bending angle and shoulder abduction angle caused by overarm throw have a negative impact on the pressure of the elbow valgus. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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