|关键词: 跳绳 刚度 力矩 能量吸收 髋 膝 踝
|Biomechanical Characteristics of Lower Limb and its Joints in the Support Period of Forward Single Roll Two feet Rope Skipping with Different Speed
|(School of Physical Education, Yanshan University)
|Objective: To test the dynamics and kinematics parameters of forward singleroll rope skipping with different speed during the support period, and to analyze the biomechanical characteristics of lower limbs and its joints. Methods: Twelve male professional rope skippers were selected to complete the continuous rope skipping with slow, medium and fast speed, and the ground reaction force and kinematics data were collected synchronously during the process. The dynamic parameters of lower limbs and its joints during the support period were calculated. Results: The peak ground reaction force and explosive force of mediumspeed rope skipping were significantly greater than those of slow and fast skipping (P <005). With the increase of speed, the range of joint motion decreased significantly (P <005). The stiffness of leg (P <001) and hip, knee and ankle joints were the largest (P <001), and the contribution degree of energy absorption of ankle joints was the largest (P <001). Conclusion: Continuous rope skipping with slow and medium speed can exercise the superisometric contraction ability of muscles around hip, knee and ankle joints. Fast rope skipping mainly exercises the superisometric contraction ability of ankle joints and the stability of hip and knee joints. Lower extremities, especially ankle joints, should be stretched and warmed up to improve flexibility so as to reduce the injury risks.
|Key words: rope skipping stiffness moment energy absorption hip knee ankle