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The purpose of this study was to compare judo-related physical fitness, body composition, and isokinetic knee functions of male judo athletes from different age groups. Subjects for this study were thirty male judo athletes and randomly divided into three groups: cadet judo athletes (CJA, n=10), junior judo athletes (JJA, n=10) and senior judo athletes (SJA, n=10). Body composition, physical fitness, anaerobic wingate test, and isokinetic knee strength test were analyzed for comparing characteristics of judo athletes with age. Statistical analysis was performed using one-way ANOVA followed Scheffe post hoc test. As the result of this study, body weight and muscle mass were significantly higher in the SJA group than those in the CJA group. The SJA group had significantly higher sit-up, vertical jump, side step and sit-and-reach values than the CJA and JJA groups, and the JJA group had significantly higher sit-up and back strength values than the CJA group. The absolute values of peak power (PP) and average power (AP) and relative values of PP in the SJA group showed significant differences compared to the CJA and JJA groups. Therefore, present findings provided research evidence that anaerobic power, maximal muscle strength and endurance would positively regulate performance of judo athletes with increasing age and athletic experience. Coaches and trainers in the field should try to provide a periodic training program to improve judo-related physical fitness and succeed.

A comparative study on changes in physical fitness characteristics of judo athletes according to their careers