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quantify degree of improvements in walking stability, which contributes to ascertain the effective-
ness of exercise intervention for elderly. Further application of the present technique may help
predicting personal risk of falls.

ACKNOWLEDGMENT

We are grateful to Dr.I.Tsuji at Graduate School of Medicine, Tohoku University. Sendail Silver
Center, and Miyagi Physical Therapist Association for their cooperation in our study. This re-
search is grant aided by Japanese Ministry of Education, Culture;, Sports, Science and Technology.

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