Department of Physical Education, Chinese Culture University, Taipei, Taiwan.
Department of Long-Term Care, National Taipei University of Nursing and Health Sciences, Taipei, Taiwan.
Int J Sports Med. 2019 Sep;40(10):663-669. doi: 10.1055/a-0970-9104. Epub 2019 Jul 31.
This study aimed to explore the biomechanical differences between single and double peak ground reaction force-time curves during the countermovement jump with respect to kinematics, kinetics, and coordination of the lower extremities. Twenty-five college students were stratified into a single peak curve group and a double peak curve group. Eight infrared cameras and two force platforms were synchronized to collect the data. Independent t-tests were performed with groups for each dependent kinematic, kinetic and time of the joint extensor concentric contraction variable. Repeated one-way analysis of variance measurements were performed for the time of the ankle, knee and hip extensor concentric contraction in each group. The double peak curve was associated with larger jump height, reactive strength index modified, rate of force development, impulse, hip, knee and ankle flexion, extension angular displacement, and hip and knee moments (p<0.05). The double peak curve group revealed a better hip, knee and ankle (proximal to distal) timing of extensor concentric contractions sequence of the lower extremities during the countermovement jump (p<0.05). The double peak curve group exhibited a more effective countermovement jump movement with respect to biomechanics compared to the single peak curve group.
本研究旨在探讨反跳过程中单次和双峰值地面反作用力-时间曲线在运动学、动力学和下肢协调方面的生物力学差异。将 25 名大学生分为单峰曲线组和双峰曲线组。使用 8 台红外摄像机和 2 个力台同步采集数据。对每个关节伸肌向心收缩变量的组间进行独立 t 检验。对每组踝关节、膝关节和髋关节伸肌向心收缩的时间进行重复单向方差分析测量。双峰值曲线与更大的跳跃高度、改良反应强度指数、力发展率、冲量、髋关节、膝关节和踝关节的屈曲、伸展角位移以及髋关节和膝关节的力矩相关（p<0.05）。双峰值曲线组在反跳过程中下肢伸肌向心收缩的顺序中表现出更好的髋关节、膝关节和踝关节（近端到远端）的时间安排（p<0.05）。与单峰曲线组相比，双峰值曲线组在反跳运动中表现出更有效的运动。
