#Rank and file sumo professional
In particular, an anterior cruciate ligament (ACL) injury is a common traumatic injury in professional wrestlers. The average weight of wrestlers is over 160 kg, so the physical load yielded in a bout frequently causes severe injury. Injuries commonly occur in most professional sumo wrestlers and negatively affect their performance. For various interesting papers on sumo, see e.g. Member countries of the International Sumo Federation host an international World Sumo Championship each year. Regarding worldwide interest in sumo, today, there are national clubs of amateur sumo wrestling in over 84 countries. There were over 600 wrestlers from the bottom to top divisions in 2022, and the capacities of the top and second from top divisions were 42 and 28, respectively. Each tournament runs for 15 days, and each wrestler in the top two divisions has one match per day while the lower-ranked wrestlers compete in seven bouts about once every two days. Since 1958, six grand tournaments of professional sumo wrestling that consists of six divisions have been held per year. Sumo, a traditional sport dating back about 1500 years in Japan, is a form of competitive full-contact wrestling where two wrestlers fight in a ring. The proposed model can also be applied to injury prediction for athletes of other sports. While a previous study modeled injury occurrences by using the Poisson process, we model it by using the Hawkes process to consider the long-term effect of injuries. In addition, it can support making a risk-based injury prevention scenario for wrestlers. The proposed model provides the estimated probability of the next potential injury occurrence for a wrestler.
Here, we propose a statistical model of injury occurrences for sumo wrestlers. However, the existing statistical methods of injury prediction are not always accurate because they do not consider the long-term effects of injuries. Statistical injury prediction is a useful way to communicate the risk of injuries for wrestlers and their coaches. As the number of injury occurrences increases, professional sumo wrestling becomes less interesting for sumo fans, requiring systems to prevent future occurrences. In 2019, an average of 5.2 out of 42 wrestlers in the top division of professional sumo wrestling were absent in each grand sumo tournament due to injury. In sumo wrestling, a traditional sport in Japan, many wrestlers suffer from injuries through bouts.
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