| （School of Physical Education，Southwest University，Chongqing 400715，China） Abstract: According to the characteristics of body movement at board striding for taking off in long jump, and by ap-plying a multiple rigid body model and modern computer simulation technology, the authors probed into the character-istics of changing of long jump farness caused by board striding in different postures, so as to seek for the optimal board striding for taking off posture, and revealed the following findings: different combinations of shank attitude angle and knee joint angle formed at board striding enable the body to reach the same farness, therefore it is obviously irra-tional to judge the performance of board striding technology based solely on the magnitude of board striding angle; at the moment of board striding for taking off in long jump, the magnitudes of influence of attitude angles of various body parts on long jump distance are different, the order of their importance is in turn the attitude angle of the shank of the take-off leg as the most important one, followed by the knee angle of the take-off leg, while the influence of torso tilting angle, thigh included angle and the knee angle of the swinging leg on long jump distance is relatively small; at the mo-ment a long jumper strides on the board for taking off in long jump, there certainly are an optimal knee joint angle of the take-off leg and an optimal included angle between the shank and the ground, which enable the long jumper to reach the farthest long jump distance if he/she strides on the board in such a way.
Key words: sports biomechanics；long jump；take-off posture；multiple rigid body model |
