earticle

영어

The purpose of this study was to compare kinematic factors between two groups for Cross jump in balance beam. Six national female gymnasts participated in this study, and four digital cameras were used to capture motions for three dimensional analysis. The results were as follows: First, in the performance time, both groups showed a similar duration, but the support time of the skilled group was shorter than the less skilled group in P1, while the duration of a flight of the skilled group was longer than the less skilled group in P2 and P3. Second, the medial and lateral displacement of COG showed a similar change during a whole motion, but the less skilled group showed a posture that the COG translated to the support leg direction in landing phase of the P5. The horizontal distance of the skilled group was longer than the less skilled group in P2. And the takeoff and apex position of the skilled group showed higher than the less skilled group in the vertical displacement generally. Third, the horizontal velocity of the skilled group showed faster velocity than the less skilled group in takeoff of the support leg(E2) and landing(P5). And the vertical velocity of the skilled group showed faster upward and downward velocity than the less skilled group on the whole. Fourth, because the skilled group showed a posture that the knee and hip joint extended, the height COG of the skilled group was high and showed an effective cross motion in the flight phase of P3, P4 and a landing motion in landing phase of P5.