The purpose of this study was to investigate whether a physiological stability and relief regions are congruent. The subjects were university Judo players. The physical stability region, the physiological stability region, and the relief regions were measured by a center of gravity sway meter. The relief region was the subliminal area which subjects felt anxious when they were broken their balance by an experimenter. The area data from Posturography were compared each region. Relationships between each region and subject attributes, i.e., sex, weight, performance, and career were analyzed. Results were as follows; 1) The regions ranked from smallest to largest were relief, physical, and physiological regions, respectively. 2) The physical stability region was 635.9 cm. The physiological stability region was 275.7 cm. The relief region was 224.3 cm. The percentage of the physiological stability region to the physical stability region was 43.3%. The percentage of the relief region to the physical stability region was 35.2%. 3) Judo career was the only factor that had an influence on the relief region (r=-0.400, p=0.100). It seems that when people are thrown, a threshold of uneasiness (relief region) is smaller with longer experience.
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