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In this paper we face the problem of safety connected to a class of throwsthat are more often applied in every level of competitions. However, to ourknowledge it has never been a scientific study on this subject in Japan and, toour great amazement, in Europe, only one, and in very recent times. While thefamily of techniques that is applied with two knees on the ground has gone overtime, increasing, without increasing the immediate traumas. this posed theproblem if these techniques were really dangerous. It was decided toinvestigate in a comprehensive way, on the immediate traumas, by Biomechanicsof the technique aimed at the safety of Tori, from children in the dojo up tohigh-level competitions. With the purpose to clarify: if the technique isdangerous, in its correct execution, for children and athletes, if thetechnique is dangerous for the accumulation of traumas in the long run build upa mathematical model of interaction between knees and Tatami. The experimentalpart was developed with a thermal imaging camera that allowed to highlight theactual 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. theresults have made clear that, if well done and on a certified tatami, thetechnique has a negligible probability of immediate trauma.

Suwari Seoi Safety: from children Dojo to High Level Competition (Biomechanical Part)