Assessment of walking stability by Lyapunov exponent estimation

Y. Ohtaki, Y. Iijima, M. Arif, A. Suzuki, R. Nagatomi, H. Inooka

研究成果: Conference article

1 引用 (Scopus)


This paper presents a unique technique to estimate walking stability utilizing a small and light-weight portable instrument. Lyapunov exponent estimation, a method of nonlinear time series analysis, was applied to quantify the dynamic stability of body sway during walking as measured by accelerometry. Fourteen young and twenty-one elderly subjects participated this study. Lyapunov exponent of the elderly subjects tended to be higher suggesting lower stability as compared to the younger subjects. Moreover, the elderly subjects suffering knee pain or frequent history of fall presented higher value as compared to those having exercise habit. The results suggest that Lyapunov exponent estimation of walking stability is useful to assess locomotive ability.

ジャーナルAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
出版物ステータスPublished - 2002
イベントProceedings of the 2002 IEEE Engineering in Medicine and Biology 24th Annual Conference and the 2002 Fall Meeting of the Biomedical Engineering Society (BMES / EMBS) - Houston, TX, United States
継続期間: 2002 10 232002 10 26

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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