Quote:
March 5, 1950, the Zen Nippon Kyogi Renmei (All Japan Kendo Federation) was established. Almost immediately the name was changed to Zen Nippon Shinai Kyogi Renmei (All Japan Pliant Competition Federation). In obtaining the initial permission to start practicing "shinai kyogi" several items permitted under rules of prewar kendo were specifically banned by the Occupation: ashi-barai, tai-atari, grappling when the shinai was dropped, and kiai (loud shouts).
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http://www.auskf.info/main/articles.htm
Perhaps this is also the origin of no-kiai in Aikikai and Ki Aikido?