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The purpose of this study was to reveal the effect of basic conditions of ramps and stairways such as the inclination and dimension of steps on muscle loads and leg joint angles considered as indices of human body loads during ascent and descent.As a result,the effects of changes in the ramp inclination and cross-section forms of stairways on muscle loads and leg joint angles were quantitatively revealed and were organized as basic data used for designs for ramps and stairways.