The effect of no sight on the walk : the relation with Romberg quotient

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  • 視覚情報遮断が歩行に及ぼす影響 : ロンベルグ率との関係
  • シカク ジョウホウ シャダン ガ ホコウ ニ オヨボス エイキョウ : ロンベルグリツ ト ノ カンケイ

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Background and purpose : The purpose of this study was determined to compare between the natural walking and the walking without sight. In addition to this, it was investigated that the Romberg quotient influences the walking without sight, for fall prevention at night. Methods : The numbers of subjects are 22 healthy students. Firstly, subjects were measured their stability of the center of mass with sight and no sight in standing position, and then the Romberg quotient was calculated. Secondly, they walked with sight, and next, did with no sight. These walk were recorded by three-dimensional movement analysis devices. Finally, integrated data was compared by tasks. Results : in blindfold walking, the walking speed (p<0.05), the stride length (p<0.01) and the angle of hip extension (p<0.01) were significantly less than those of natural walk. Moreover, subjects were divided two groups by the step width in walking. One group was which expanded the step width (mean step width:112.7±10.4%. Romberg quotient: 1.2 ±0.2, n=13) and another was which closed it (mean step width:85.7±7.2%, Romberg quotient: 1.5 ±0.2, n=9). In the latter group, there was significantly correlation coefficient between Romberg quotient and the step width (r=-0.9, p<0.01). Conclusions and Discussion : Consequence, the behavior of walking in the dark seems changing to be more likely to slowly pace. Generally speaking, slowly walk attends more lateral movements of center of mass. However young people are able to stand on one foot without difficulty. Therefore, they choose the strategies which close their step width for reducing the lateral movements of center of mass as much as possible.

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