短跑运动员膝关节屈伸肌在不同速度下肌力变化研究

Research on sprinters knee flexion and extension muscle strength at different speeds

利用德国ismoed-2000等速肌力测试与康复系统,对短跑运动员下肢膝关节进行60°/s、120°/s、240°/s不同角速度下等速向心收缩测试研究。结果表明:①膝关节左右两侧屈伸峰力矩随着角速度增加而减小,右侧峰力矩略大于左侧;膝关节左右两侧屈伸相对峰力矩随着角速度的增加而减小,右侧相对峰力矩较左侧小,但差异不显著;②膝关节左右两侧屈伸肌力平均功率随着角速度的增加而增加;除120°/s外,随着角速度增加而左右两侧屈伸肌平均功率差异显著;③膝关节左右两侧屈伸肌之比随着速度的增加而增大,但随着角速度的增加屈伸比没差异(除240°/s右侧屈伸比以外)。

German ismoed-2000 isokinetic muscle testing and rehabilitation system was used to the study of cardiac contractility for the sprinters to lower limb knee 60°/s,120°/s,240°/s angular welocity under different isokinetic test.The results showed that：1 The right and left knee flexion and extension strength was slightly greater than the right side of the left,relative peak torque increases with decreasing angular velocity of the right than the left side of a small,but the difference was not significant;2 Left knee both sides of the flexion and extension strength of the average power increases with the angular velocity,（except 120°/s）and the left extensor of the average power is greater than the right side with the increase in the relative peak torque angular velocity decreases;3 The right and left knee flexion and extension muscle ratio increases as the speed increases,（except flexion and extension muscle ratio of 240°/s） which was in line with domestic isokinetic muscle strength testing research.