In the 2009-2017 period, many changes were added in judo rules, especially after London 2012 Olympics to promote "positive" actions (constant search for maximum score) instead of "negative" actions (avoiding opponents' attacks). International Judo Federation publishes data and general statistics (www.judobase.org). Two published papers (*) used these data to analyze the total match duration, frequency of scores (ippon, waza-ari, yuko) and penalties (shido) between two Olympics Games (London 2012 and Rio 2016) and between two World Championships (Astana 2015 and Budapest 2017) before the rule changes and after the rule changes, considering the different weight categories and competition phases. Professional magazines are interested by these results, and our objective, within the framework of the popularization of the scientific works, is to present an abstract of these two papers, providing a visual point of view of these two papers. A timeline was built to resume the different changes of the rules within the period 2009-2017, and results are presented with two tables and arrows to show evolutions. The effects between the two Olympics were negative, they became better between the two world championships. At that time, rule changes did not achieve the goal to increase scores and decrease penalties, but that this seems to be changing in the last modifications made for the 2017 World Championship. Beyond rule changes, these effects, (while the periods of these 4 championships overlap) could be explained by the frequency of the events and their own modes of selection.
© Copyright 2018 Alle Rechte vorbehalten.