Abstract: Objective: The purpose of this paper is to investigate the characteristics of elite male weightlifters’ trunk and knee isokinetic muscle strength, and analyze their correlation with snatch and clean and jerk performance. Method: IsoMed 2000 is used to conduct isokinetic muscle strength test on12 subjects` trunk and knee joint. Results: The indexes of the relative peak torque, untagonist muscle, the ratio of the active muscles and the ratio of side muscle with the same name are analyzed. The correlation between the relative peak torque of the trunk and knee and the subjects’ snatch /weight, lean and jerk weight/ weight are also analyzed Conclusion: (1) The subjects F/E ranges from 0.27 to 0.50, H/Q(0.41 -0.73), with the difference of most subjects’ side muscle of knee with the same name being within 20%, but in the quick test, 3 players need to strengthen the weaken side muscle group. 2)Snatch /weight demonstrates moderate positive correlation significantly with back extensor and knee medium-speed flexor, knee joint extensor’s relative peak torque values. The clean and jerk/ weight and the relative peak torque value of jerk trunk extensor have significantly moderate positive correlation with the relative peak torque values of the knee extensor. It is suggested that athletes should strengthen their explosive force of trunk extensor and their absolute strength and explosive powering the knee joint extensor.

Key words: weight lifting, Isokinetic testing, back, knee joint, correlation