Kinolik Z, Garhammer J, Gregor R J
Med Sci Sports Exerc. 1980;12(5):352-6.
The purpose of this investigation was to study the variation in ground reaction forces during take-off and to calculate the angular impulse produced about the center of mass by these forces during execution of a front aerial somersault. Additionally, several kinematic variables were discussed in relation to performance. Nine high level female gymnasts volunteered as subjects. Ground reaction force (GRF) patterns were monitored by a Kistler force platform and the selected kinematic variables were calculated from high speed film synchronized with the force records. Total body center of mass position was determined and subsequently used in the calculation of angular impulse during rear, double, and front leg support. While results showed similar angular impulse patterns across our subject population, a variety of kinetic and kinematic variables were presented in order to more completely discuss the components of angular impulse development during the take-off phase of a front aerial somersault. For example, while the mean angular impulse was 61.7 Nms (+/- 13.1), a surprising finding was the contribution made to this impulse by the rear leg, 70.9% (+/- 7.2).
本研究的目的是研究起跳过程中地面反作用力的变化，并计算在完成前空翻时这些力绕质心产生的角冲量。此外，还讨论了几个与表现相关的运动学变量。九名高水平女子体操运动员自愿作为受试者。通过奇石乐测力平台监测地面反作用力（GRF）模式，并根据与力记录同步的高速影片计算所选的运动学变量。确定了全身质心位置，并随后用于计算后腿支撑、双腿支撑和前腿支撑期间的角冲量。虽然结果显示我们受试者群体的角冲量模式相似，但为了更全面地讨论前空翻起跳阶段角冲量发展的组成部分，还呈现了各种动力学和运动学变量。例如，虽然平均角冲量为61.7 Nms（±13.1），但一个惊人的发现是后腿对该冲量的贡献为70.9%（±7.2）。
