Rank in Judo are ranked in ascending numerical order. The ninth ("kudan") and tenth degree black belt ("jūdan") and, theoretically, those higher, have no formal requirements. Only 15 individuals have been promoted to the rank of Kōdōkan 10th dan. On January 6, 2006, three individuals were promoted to this rank simultaneously: Daigo Toshirō, Ichirō Abe, and Ōsawa Yoshimi. This is the most ever at the same time, and the first in 22 years. No one has ever been promoted to a rank higher than 10th "dan", but in theory the Judo rank system is not limited to 10 degrees of black belt. The
Judo in Canada 1989. A third article, "Physical performance attributes of junior and senior women, juvenile, junior, and senior men judokas", presents the results of a study of the 1989 Alberta Judo Team and was published by N.G. Little in "The Journal of Sports Medicine and Physical Fitness" in 1991. Kinesiologist, 1993 Canadian Champion (-65 kg category), and former member of the Canadian Judo team Wayland Pulkkinen self-published "The Sport Science of Elite Judo Athletes: a Review & Application for Training" in 2001. Two undated articles derived from the book are available on the website "JudoInfo.com". Other authors have focused on the social