|（1.School of Physical Education，Northeast Normal University，Changchun 130024，China；2. School of Physical Education，Jilin University，Changchun 130012，China)
Abstract: The authors tested and analyzed muscle torques of the lower limb knee and ankle joints of national men’s free-style wrestlers who prepared for the London Olympic Games by using ISOMed-2000 isokinetic test system, and revealed the following findings: 1) from the perspective of torque, with the increase of test speed, there was a significant difference (P<0.05) in the characteristics of muscle power of the knee and ankle joints between key and non key wrestlers, and the torque angles of flexor and extensor muscles presented different characteristics respectively, which means quick power is particularly important to low limbs; 2) from the perspective of peak torque ratio, in low speed motion, both key and non key wrestlers of team China had such a problem as that the ratio of flexion torque to extension torque was unbalanced, i.e. there was a sign of irrational development of flexor and extensor muscle groups in terms of maximum power (<50%); with the increase of test speed, although the ratio of flexion toque to extension torque tended to rational (in the range of 50% - 80%), it was low generally; 3) there was a sign of unbalance as well in the comparison of designation identical muscle groups at both sides of knee joints, especially, there was a big difference between extensor muscles at both sides; 4) there was a similar sign in the characteristics of muscle power of knee joints (refer to the text for details), but flexor muscle power is significantly weaker than extensor muscle power. The said findings indicated that men’s freestyle wrestlers should practice more for the balance of power of flexor and extensor muscle groups at the left and right sides, and in terms of ankle joint, give priority to flexor muscle power training.
Key words: sports biomechanics；muscle torque；knee；ankle；man free style wrestling；elite athletes；China