下腿部電気インピーダンスによる歩行分析(3部評価・診断)

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This paper describes gait analysis based on electrical impedance of the lower leg while walking. Electrical impedance at 5kHz was measured and stored as a set of impedance data by a system composed of an impedance detector and a microcomputer. Subjects were normal people aged 21 to 41, infants, children, old people and handicapped people. Each set of impedance data was divided into subsets of each gait cycle. Then they were transformed into two types of data: (i) superimposed impedance waveforms and (ii) a normalized and averaged impedance waveform. Each individual group of subjects had a different pattern in these waveforms, which showed the characteristics of each gait. In order to evaluate the gait quantitatively, six parameters have been defined: (1) Similarity of each impedance pattern to averaged pattern of normal subjects, (2) Stability of gait cycle time, (3) Stability of impedance level, (4) Variation of impedance during gait cycle, (5) Variation of impedance in stance phase, (6) Sharpness of impedance pattern. The values of these parameters were represented on six coordinate axes, which were built by connecting six vertices of a regular hexagon with its center. The coordinate at each vertex equals the mean value of the corresponding parameter in normal subjects. The closer the coordinate got to the center, the larger the abnormality became. The gait could be evaluated by the size and shape of the hexagon, which was formed from the six coordinates corresponding to the subject. Hexagons of normal subjects were big and similar to the regular hexagon; however, hexagons of patients were reduced and distorted significantly. The hexagons of both infants and old men were distorted, but their forms were in contrast to each other. The differences in size and shape of the hexagons showed the degree of normality, Stability and forcibleness in the gaits of the subjects. This method can measure easily the electrical impedance and is applicable to rehabilitation clinics and training. By assembling and analyzing many kinds of impedance, useful criteria for gait evaluation may be established.
バイオメカニズム学会の論文
1990-09-10

下腿部電気インピーダンスによる歩行分析(3部評価・診断)

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下腿部電気インピーダンスによる歩行分析(3部 評価・診断)

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下腿部電気インピーダンスによる歩行分析(3部評価・診断)