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Suwari Seoi Safety: from children Dojo to High Level Competition (Biomechanical Part)
Attilio Sacripanti ·
Summary
Written by AI, not yet AICS's view · claude-haiku-4-5-20251001This biomechanical study examines the safety of Suwari Seoi throwing techniques in judo, from children's training to competitive levels. Using thermal imaging, researchers measured impact stress on the knees during the technique. The analysis concludes that when performed correctly on certified mats, the technique poses negligible risk of immediate injury.
Key points
- No prior scientific study on this judo technique's safety existed in Japan or Europe (except one recent European study)
- Research used thermal imaging to identify actual impact surfaces and stress on knees
- Study included both children in dojos and Italian National Team athletes
- When technique is performed correctly on certified tatami, probability of immediate trauma is negligible
- Technique has been applied increasingly over time without corresponding increase in immediate injuries
Limitations
This is a biomechanical/technical study focused on immediate physical trauma rather than broader child health outcomes or well-being. The document does not discuss long-term developmental impacts, accessibility, or application across different populations and skill levels beyond the specific group studied.
Abstract
In this paper we face the problem of safety connected to a class of throws that are more often applied in every level of competitions. However, to our knowledge it has never been a scientific study on this subject in Japan and, to our great amazement, in Europe, only one, and in very recent times. While the family of techniques that is applied with two knees on the ground has gone over time, increasing, without increasing the immediate traumas. this posed the problem if these techniques were really dangerous. It was decided to investigate in a comprehensive way, on the immediate traumas, by Biomechanics of the technique aimed at the safety of Tori, from children in the dojo up to high-level competitions. With the purpose to clarify: if the technique is dangerous, in its correct execution, for children and athletes, if the technique is dangerous for the accumulation of traumas in the long run build up a mathematical model of interaction between knees and Tatami. The experimental part was developed with a thermal imaging camera that allowed to highlight the actual impact surfaces and therefore to trace the stress received by the knees, both for the children and for the athletes of the Italian National Team. the results have made clear that, if well done and on a certified tatami, the technique has a negligible probability of immediate trauma.