Is the distances of standing long jump as a function of leg and joint stiffness

• Main Authors: Wen Hsin, Hsu, 許文心
• Other Authors: Ti Yu, Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/73587275648813231580

碩士 === 國立彰化師範大學 === 應用運動科學研究所 === 101 === The purpose of this study was to examine the adjustment of leg and joint stiffness when a human body achieves various distances of standing long jump. Ten volunteer male college students of physical education served as the participants (age: 21.6 ± 2.3 years old, height: 169.0 ± 4.4 cm, weight: 66.9 ± 6.0 kg). The experiment required every participant to take three tests of the 100% maximum distance （Dmax）. The best result among the three was selected as the basis for setting up the other 80%, 60%, 40%, and 20% Dmax tests. The subsequent tests required all participants to randomly perform these distance settings with the hands-on-hip standing long jump. The Vicon MX-F40 three-dimensional motion analysis system and the Kistler force platform (1000 Hz) were used to record the participants’ parameters of the kinematics and kinetics. The repeated measures of one-way ANOVA, and the HSD post-hoc were used for the statistical testing of the conditions for the five standing long jumps (α = .05). The results showed that the distance of standing long jump affects the leg and joint stiffness. Thus, the knee stiffness had significant differences on the distance variation (p < .05). However, the influence of distance on the hip and ankle joints stiffness was not significant. In addition, the results revealed that the longer the distance, the smaller the stiffness of the hip, knee, ankle and the leg. Also, the leg stiffness was influenced first by the adjustment of the stiffness of the knee joint, and secondly by the stiffness of the hip joint.