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Since Basler developed the force plate in 1935 many researches of gait analysis have been carried out. But the traditional force plates were so small in size that one could measure only one step during ambulation, the data were unreliable and were not always suitable for the clinical use.In 1981, a large scale force platform, 10.8m. in length and 1.2m. in width, was created in order to improve the reliability of data, to make less interference with a gait pattern and to measure as many steps as possible. In this paper, the methods of measurement, transaction and gait evaluation system are described.Through the force platform, three dimensional floor reaction factors, i. e. vertical, fore and aft and right and left, and paths of center of pressure are given. Then, these data are sent to a mini-computer through an A/D converter and are expressed on a display. A print-out table and flexible discs are also available to store the records. Moreover, an os-cillograph, by which we can preserve the analog data, and a data recorder were imported for the exploitation of researches.To evaluate the gait pattern, we use quantitative evaluation indices which are calcu-lated by Fourier analysis of vertical and fore and aft components in the waves of the total reaction forces. That is to say, the sum total of amplitude of the specific wave to amplitude of the fourth harmonics in the total reaction forces, which are basic oscillating com-ponent of two gait cycles, (I=∑Ai/A4), is defined as each evaluation index of reappearance (i=2n-1), symmetry (i=4n-2) and smoothness (i≥5). Besides, the acceleration of the center of gravity is double integrated, and amplitude of the double integrated wave, which has relations with displacement of the center of gravity, is defined as an evaluation index of sway.The followings are the characteristics of our system.1) It is able to measure many steps of gait and to obtain more reliable data than the one step type force plate.2) It is able to utilize the system multipurposely, e. g. transfer activity, wheel chair evaluation.3) It is able to obtain the results of the gait evaluation rapidly and conveniently by using a software for gait analysis, and so is it suitable for the clinical use
- 一般社団法人 国立医療学会の論文
一般社団法人 国立医療学会 | 論文
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