Biomechanical characteristics of bending and stretching muscle groups of the knee joint of high jumpers and volleyball players
By applying the Cybex-6000 constant velocity test system,the authors did a constant velocity centripetal muscle strength test on muscle groups of the knee joint of 22 volleyball players and 28 high jumpers in order to probe into the characteristics and differences of constant velocity muscle strength of the knee joint of athletes in such two different events as volleyball and high jump,and revealed the following findings: the relative peak mo-ment of quadriceps of thigh of the advantageous leg and non-advantageous leg of the high jumpers is greater than the same of volleyball player both at 360(o)/s and 90(o)/s;there is no significant difference in relative peak moment of hamstring between the volleyball players and high jumpers,and the degree of difference between peak moment(90(o)/s) of hamstring at both sides of the volleyball players is significantly lower than the same of the high jumpers;the ratio of peak moment of quadriceps of thigh and hamstring of the volleyball players,as measured at the speed of 90(o)/s,is significantly lower than the same of the high jumpers;with the change of angular velocity(90~360(o)/s),the ratio of peak moment of quadriceps of thigh and hamstring of the volleyball players and high jumpers increases.