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This study assessed the effect of one year of traditional judo training on aggressiveness among young boys. 27 primary school pupils and 28 judo students were asked to complete the Buss-Perry Aggression Questionnaire at two times 1 year apart. Analysis showed that judoka were more aggressive (had higher scores on Total Aggression, Verbal Aggression, and Anger) than the control group after one year of training, even if variations in aggressiveness were not significant. So, results do not support the view that judo training leads to less aggressiveness in a sample of children this young.
Reynes et al. (Fri,) studied this question.