The Biomechanical Analysis of Landing from Two Heights with Three Different Postures

• Main Authors: Wen-Hui Chen, 陳雯惠
• Other Authors: 陳五洲
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/39102002815682333510

碩士 === 國立體育學院 === 運動科學研究所 === 91 === The landing movements were highly related to the lower extremity injuries. A good landing movement was supposed to effectively absorb the landing impact. The purpose of the study was to understand how the upper extremity and trunk motions influenced the ground reaction force. In this study, the Kistler force platform system, Peak and Panasonic AG-456 high speed cameras were synchronized used to collect the kinetic and kinematic datum of twelve subjects (Age: 22.7±2.0 years old, Height: 172.0±6.7cm, Weight: 74.4±10.8kg) landing from two different heights (32 cm and 63 cm) with three different postures (free landing, upper extremity restricted, upper extremity and truck restricted). After statistical analysis with two-way ANOVA repeated measure and Tukey’s post hoc procedure (α =.05) were applied, the results indicated that: (1) When landing from two different heights, the contact joint angle, the maximal joint angle displacement, the maximal joint velocity and time to maximal joint velocity of three lower extremity joints and the peak vertical ground reaction force, time and slope to peak force, and the passive impulse in less than 50 mini-seconds were obviously different. (2)While the height was the same, the peak vertical ground reaction force and the passive impulse in less than 50 mini-seconds were different among three different postures. The upper extremity restricted posture had the smallest peak vertical ground reaction force and the smallest passive impulse. The maximal and the summation lower extremity joints’ angle displacement and the peak vertical ground reaction force and time to peak force were analyzed by Pearson product-moment correlation. The result indicates that the knee and hip joint angle displacement and the summation of the lower extremity joints’ angle displacement were obvious negatively correlated to the peak vertical ground reaction force. Thus, to effectively attenuate the ground reaction force, to flex the lower extremity joints was necessary and to increase the knee and hip joint displacement could effectively attenuate the landing impact.