The relationship between knee joint angle, stretch-shorten cycle performance, and jump distance in ski jumping

Knee;Biomechanics;Ski jumping

Paradis, SethFoster, C. ;

University of Wisconsin

关键词: Knee;    Biomechanics;    Ski jumping;   

Others  :  https://minds.wisconsin.edu/bitstream/handle/1793/48881/Oparadisseth2000.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: University of Wisconsin

【 摘 要 】

This investigation examined the relationship between knee angle, stretch-shorten cycleperformance, and jump distance in ski jumping. 44 elite ski jumpers were video taped at120 Hz. Hip, knee, and ankle displacements were digitized to examine the relationshipbetween the knee joint angle, stretch-shorten cycle performance, and jump distance in skijumping. Jump distance was recorded for comparison. Average distance jumped was99.03 f 11.6 m. During the stretch-shorten cycle movement, the average amount of kneeflexion was -6.6 + 3.9 ;; and the average amount of knee extension was 8.8 f 4.8 ;;. Asignificant (p = 0.014) quadratic relationship as found between the amount of kneeflexion and jump distance. The knee-joint extension velocity averaged 9.2 f 0.8radians/s, but was not found to be significantly related to jump distance. The quadraticrelationship between jump distance and the amount of knee joint flexion demonstrated anoptimal knee flexion range for maximizing jump distance. This study suggests that whenelite jumpers utilize an optimal stretch-shorten movement, in combination with properform on the take-off table and in the air, they produce longer jump distances.