earticle

영어

This study was conducted to investigate the running motion in the 3, 4, 5 m/sec running velocity by performed elementary school athletes. Ten elementary school male athletes who achieved at least the 3rd place in the sprint at the Korea Gangwon-Do elementary school track and field meetings were selected as subjects. The running motions performed by the subjects were recorded using two 8mm cameras at the nominal speed of 90 frames per second. The Direct Linear Transformation technique was adopted from the beginning of filming to the final stage of data extraction. KWON 3D motion analysis package program was used to compute the 3 Dimensional coordinates, smoothing factor in which the lowpass filtering method was used and cutoff frequency was 6.0 Hz. The movement patterns during foot touchdown and takeoff for the running stride were related with the biomechanical consideration. Within the limitations of this study it is concluded: First, as the velocity increase, the body C.O.G(Center of Gravity) height should be raised at the instant of leg touchdown and takeoff during the running. As increase running velocity, while taking a slightly greater body lean angle within the range of the subject's running motion during at touchdown and takeoff phase would reult in greater flight distance. Second, as the velocity increase, the foot contact time should be shortened during the running. Third, as the velocity increase, the angular velocity of foot joint torsion increase. The angular velocity of foot joint torsion of the higher running velocity is larger than that of other running velocity at touchdown and takeoff phase. In order to get rid of the joint injuries, as the velocity increase, the supination must be increased. And, as the velocity increase, the angular velocity of Achilles tendon increase at the touchdown and takeoff phase. Because the increasing velocity make up ankle ligament injuries, We need to thicken the portion of the metatarsal a litter bit when the running shoes. Forth, as the velocity increase, the angular velocity of foot joint increase at touch-down and take-off phase. Also, as the velocity increase, the shank angular velocity with respect to a transverse axis through the center of gravity should be increased during the leg touchdown and takeoff. Therefore, the active landing style described as clawing the ground with the sole of the foot should be performed during the leg touchdown and takeoff phase.