In Judo the relationship between tatami and judoka is extremely important, but often overlooked. The aim of this study is to analyze the different thermo-elastic responses of different tatami under impact load obtained by different Judo throws. The work was carried out taking infrared thermal images and by analysis of temperature profiles of the impact areas produced by Uke after the fall onto tatami. The thermo-elastic effect is due to the conversion between the mechanical forms of energy and heat. It occurs when changes of stresses within a material element alter its volume. Density of energy created in material element is transformed into local change of temperature due to both the thermo-elastic (reversible) effect and to (irreversible) dissipative phenomena. An infrared imaging system offer the opportunity to study the thermo-elastic effect related to the variation of the volume experienced by the polymer material (mat) under impact load (throws). Because it is impracticable to reduce the magnitude of the impact during training and competitions, the correct throw execution and the use of proper mat (flexible structure under the mat) may reduce the magnitudes of impacts and vibrations, mitigating the adverse effects on the body of judoka.
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