Study aim: The aim of the study was to determine the value of indices characterizing the efficiency in attack and in defence in Judo influencing the course and the outcome of Japanese and Russian representatives` fights. Material and methods: Research material comprised the results of observations and an analysis of bouts of Japanese (n = 15, 124 bouts) and Russian (n = 16, 103 bouts) athletes during the World Championships in 2013, 2014 and 2015. The observed athletes` bouts were with different opponents. The collected material allowed determination of the value of the efficiency in attack indices (Sa) of groups of judo techniques and the indices in defence (So) characterising Japanese and Russian representatives` opponents. The techniques dominant among the observed athletes were identified. Results: The Japanese were characterised by significantly higher values of the efficiency in attack indices resulting from throws, in particular, foot throws. The efficiency in defence in both teams was significantly lower when applying holds rather than throws. Representatives of Russia also had high efficiency in applying joint locks and low efficiency in defensive actions. Conclusion: Sports results obtained by representatives of both teams were connected not only with the efficiency of their defensive actions, but also with the type and efficiency of the techniques dominant in attack.
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