立位時の浮き趾が前方への安定性限界に及ぼす影響について

抄録

  Floating toe is defined that the toe has no contact with the floor surface during standing. Therefore, the decreased stability limits in the forward direction in people with floating toe are expected. The effects of toes on the stability limits have been examined by divided into two groups: the great toe and the other toes. However, the stability limits affected by each toe should be investigated because of the different anatomical functions of each toe. The purpose of this study was to investigate the effects of a floating toe on the forward stability limits. Ten healthy young females performed the maximal voluntary forward-leaning during standing under the six conditions: no lifting toes and each lifting toe from great to little toe condition. The toe was pulled upward through a string using a weight. The stability limits were calculated by the displacements of center of pressure in the sagittal plane. The stability limits under the lifting great toe condition were smaller than the other conditions. Interestingly, those under the lifting second toe condition were reduced compared to the lifting third toe condition, but no change was shown between the lifting from the third to fifth toes and no lifting condition. These results suggest that the lifting great or the second toe, but not the lifting from the third to fifth toes, restricts the forward stability limits.