Kinematic analysis of 3-point shooting in different defense distance

• Main Authors: Lin,Cheng-Ta, 林正達
• Other Authors: Tsai-Chien-Lu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/6b7msg

碩士 === 國立臺灣師範大學 === 體育學系 === 97 === The purpose of this study was to examine the different kinematic parameters of 3-point jump shots with three disparate defense distances (1 meter, 1.5 meters, and 2 meters). The researcher collected the kinematic parametric data of 3-point jump shots with three kinds of defense distances by six male basketball players from senior high school Division A with a Redlake high speed camera (125Hz). A nonparametric Friedman test was adopted to analyze the significance of difference and Spearman rank correlation coefficient for the statistical calculation. The results indicated that the release velocity, release angle, and release height increased with shortened defense distances; the lowest center of gravity was demonstrated from no defense to a 1.5-meter defense distance. The angle of lower limb joints decreased and angular velocity increased with a shortened defense distance. The angle of lower limb joints increased and angular velocity decreased with a 1-meter defense distance; the angle of upper limb joints didn’t exhibit discrepancy at the moment of release, with the negative correlation between the angular velocity of upper and lower limb joints at the lowest center of gravity. The angular velocity of upper limb joints decreased from no defense to a 1.5-meter defense distance, and displayed greater angular velocity and the greatest difference of shoulder joints with a 1-meter defense distance; the release angle of center of gravity decreased when the defense distance shortened, and the percentage of 3-point shots didn’t exhibit significant difference with respective defense distances, but the two factors were still correlated. Therefore, the features of 3-point shooting actions and percentage were different in the disparate defense distances. The center of gravity was lower when the defense distance was more than 1.5 meters, while more lower limb power was exerted when the distance was shorter. The center of gravity was higher with less lower limb power when the defense distance was within 1 meter. The shooter increased the upper limb action velocity to compensate for the lack of lower limb power. However, from the experiment and the analysis of shooting percentage, the decrease of lower limb lower could influence the stability of shooting. As a result, coaches should understand the distinct action characteristics with respective defense distances when training students to shoot in the future. Better efficiency and efficacy could be expected with appropriate adjustment in the teaching methods.