The purpose of this study was to determine and compare the reliability of 3 dimension reaction forces and impulses in walking with 3 different heel shoe conditions. These results suggest that changing the height of the heels affects mainly the reliability of the ground reaction force and impulse measures on the medial and lateral dimension and not the vertical and the anterior-posterior dimensions. The force and impulse measures are more reliable in the high heel shoe condition than in the low heel shoe condition. To keep the consistent (reliable) walking pattern, more muscular stress has to be placed on the foot muscles when one wears high heel shoes. The results lead us to believe that further research is needed to elucidate the difference of the muscle activities where one wears high heel shoes. The influence of muscle fatigue on pathological symptoms in walking also needs additional research. (Contains 1 table and 2 figures.)