A comparative study on the characteristics of three points jump shot of basketball players of different levels in the competition
(2.Beijing Sport University, Beijing, China 100084)
(3.Guizhou Normal University 550025)
【Abstract】Purpose: Jump shot has become the main means of scoring in modern basketball matches. Comparing the movement characteristics of three point jumpers in different level competitions, it can reveal its common characteristics and optimization features. Methods: This study analyzed the three points jump shot in China Basketball Association (CBA, high level competitions), Chinese University Basketball Super (CUBS, middle level competitions) , and the amateur league (low level competitions) by using 3D camera and video analysis system, and the data was analyzed by one-way analysis of variance. Conclusions: Common features of jump shot are as follows. (1) The longest duration of stages of jump shot was the lifting stage, followed by the stabilization stage, the pitch stage, the ball stage and the preparation stage. (2) With the upward speed of the center of gravity, the ball had a larger initial speed and the release speed was greater. (3) The joints followed the order of force from the proximal end to the far end, and the angular velocity of each joint increased from the proximal end to the far end. The maximum elbow speed was almost the same as that of the ball, which may have the greatest impact on the speed of the ball. (4) In the stable stage, the small external elbow angle was related to the anatomical structure of the upper limb joints. In the stable stage, the small external elbow angle was related to the anatomical structure of the upper limb joints. The abduction of the upper arm, the rotation of the shoulder axis and the hip axis were beneficial to the elbow, wrist and eyes on the ring. It kept the flexion and extension of the joints of the upper limbs consistent with the direction of the ball’s flight, and made the ball be closer to the rim before release. (5) In games, a slight backward dip of the trunk could help to draw the horizontal distance from the defender and reduce interference from defense. It also helped maintain the balance and stability of the body and formed a greater angle of release. Optimization features of jump shot are as follows. (1) The duration of one jump shot was longest in high level group, the jump shot had longer stability stage, flight time and ball stage. This may be caused by the higher take-off height and the release timing to get closer to the highest point of gravity in high level group. The longer stable stage and the flight time made the body center of gravity more stable, and had more time to adjust the posture and control of the ball. The longer ball stage indicated that the action was more complete, which was conducive to better movement effect. (2) The higher and middle level group had higher height than the low level group. Its main reason was take-off height and release timing as well as body height.
【Keywords】 basketball; three points jump shot; action feature; 3D camera;
 http://news.qq.com/a/20141215/020932.htm, 2014-12-15.
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