TY - JOUR
T1 - Assessment of walking stability of elderly by means of nonlinear time-series analysis and simple accelerometry
AU - Ohtaki, Yasuaki
AU - Arif, Muhammad
AU - Suzuki, Akihiro
AU - Fujita, Kazuki
AU - Inooka, Hikaru
AU - Nagatomi, Ryoichi
AU - Tsuji, Ichiro
PY - 2006/6/15
Y1 - 2006/6/15
N2 - This study presents an assessment of walking stability in elderly people, focusing on local dynamic stability of walking. Its main objectives were to propose a technique to quantify local dynamic stability using nonlinear time-series analyses and a portable instrument, and to investigate their reliability in revealing the efficacy of an exercise training intervention for elderly people for improvement of walking stability. The method measured three-dimensional acceleration of the upper body, and computation of Lyapunov exponents, thereby directly quantifying the local stability of the dynamic system. Straight level walking of young and elderly subjects was investigated in the experimental study. We compared Lyapunov exponents of young and the elderly subjects, and of groups before and after the exercise intervention. Experimental results demonstrated that the exercise intervention improved local dynamic stability of walking. The proposed method was useful in revealing effects and efficacies of the exercise intervention for elderly people.
AB - This study presents an assessment of walking stability in elderly people, focusing on local dynamic stability of walking. Its main objectives were to propose a technique to quantify local dynamic stability using nonlinear time-series analyses and a portable instrument, and to investigate their reliability in revealing the efficacy of an exercise training intervention for elderly people for improvement of walking stability. The method measured three-dimensional acceleration of the upper body, and computation of Lyapunov exponents, thereby directly quantifying the local stability of the dynamic system. Straight level walking of young and elderly subjects was investigated in the experimental study. We compared Lyapunov exponents of young and the elderly subjects, and of groups before and after the exercise intervention. Experimental results demonstrated that the exercise intervention improved local dynamic stability of walking. The proposed method was useful in revealing effects and efficacies of the exercise intervention for elderly people.
KW - Accelerometer
KW - Biomechanics
KW - Human engineering
KW - Information processing and signal analysis
KW - Medical application
KW - Nonlinear time-series analysis
KW - Walking stability
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U2 - 10.1299/jsmec.48.607
DO - 10.1299/jsmec.48.607
M3 - Article
AN - SCOPUS:33745219403
SN - 1344-7653
VL - 48
SP - 607
EP - 612
JO - JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
JF - JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
IS - 4
ER -