Abstract
Research was conducted to determine minimum required dimensions for rise and going of stairs from the viewpoint of safety during traverse. Five experimental stairs were used to realize maximum range of dimensional varieties that are encountered in Japan. Four young male subjects climbed up and down the stairs : their behaviour on the stairs and impact force they apply to the tread were measured and analysed. Detailed examination of the data suggests that minimum allowable going is 210 mm to assure firm support by the ball joint of the foot, and that maximum allowable rise is 180 mm. This value for rise is too low compared to existing stair dimensions, that other measures to secure safety during stair climbing should be provided.
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