|（School of Physical Education，Jiangxi Normal University，Nanchang 330022，China)
Abstract: By using the Isomed 2000 isokinetic muscle strength test system made in Germany, the authors did an isokinetic muscle strength test on the elbow joint flexors and extensors of 7 climbers (1 excellent climber and 6 or-dinary climbers) at the angular speeds of 60(°)/s, 120(°)/s and 180(°)/s, and calculated coefficient of variation to evaluate the differences and balance between their left and right hands, and between their flexors and extensors. The authors tried to find out the unique biomechanical characteristics of the elbow joint flexors and extensors of the ex-cellent rock climber, so as to provide a reference criterion for guiding scientific climber screening and training. The peak torques of the extensors of the excellent climber were basically the same as those of the ordinary climbers, there were no significantly differences, however, the peak torques of his left and right hand flexors, measured at the three angular speeds, were all significantly greater those of the ordinary climbers (P<0.05); the peak torque occur-rence angles of the flexors of the excellent climber were not significantly different from those of the ordinary climbers, however, the peak torque occurrence angles of his extensors were all approximately 36°, significantly smaller than those of the ordinary climbers, which were approximately 80° (P<0.01); there were no significant dif-ferences between the excellent climber’s left and right hands, no matter in terms of flexor peak torque or in terms of extensor peak torque, their CVs were all significantly smaller than those of the ordinary climbers (P<0.05), while the peak torque of the right hand of the ordinary climbers was significantly greater than that of their left hand (P<0.01); the differences between the peak torques of the flexors and extensors of the excellent climber were small, no mater in terms of his left hand or in terms of his right hand, their CVs were all significantly smaller than those of the ordinary climbers (P<0.01). The results indicated the following: in terms of the elbow joints of a rock climber, powerful flexors, extensors with a faster contraction speed, as well as muscle strength balance between left and right hands and between flexor and extensor, are likely important factors for the rock climber to achieve an outstanding result in a competition.
Key words: sports biomechanics；isokinetic muscle strength；elbow joint flexor and extensor；rock climber