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Because of a growing elderly population and a declining birthrate, more elderly are needing nursing care, and the workload for doctors is growing heavier. Therefore, it’s necessary to save labor by using an at-home device to aid nursing. We focus on a device called Patakoro that can stretch and flex the knee joint, and plantar flex and dorsiflex the ankle joint. With electromyography and the Patakoro device, we constructed a system that can increase people’s walking abilities in motivation exercise. This motivation exercise can help paralytic people to strengthen their paralytic side by practicing with the non-paralytic side leg. As a result, we found that there is a significant difference in muscle activity within three sitting positions in which the height of the chair is placed at different levels. Introduction Since the elderly population will increase more and more, it is necessary to create and spread more efficient rehabilitation alternatives in order to save labor of medical personnel. One of the issues in rehabilitation is the quantification judgment of the walking ability. In our laboratory, some feet parameters which have a high relation with the walking ability score were found and we have constructed a system that can quantitatively judge the walking ability (1)-(5) . In addition, we observed that different samples of people with different heights used the same chair. There the location of the knee joint may be an important factor, and its movement also effects the muscle’s function. Therefore, in this research, the purpose of this paper is to make the device that can measure a knee angle change and to find the relationship between the subject’s muscle activity and the sitting positions, that is, with different chair heights, when they are using the Patakoro rehabilitation device. Experiment (1) Experimental apparatus Figures 1 and 2 show the Patakoro rehabilitation device which was used in this study. The device is 1000mm in length, 300mm in width. The feet board is 275mm in length, 250mm in width. In the state where the fixture without spring is fitted on the two rails as shown in Fig.1, the people can step on the board and move forward and backward to stretch and flex the knee joints. That movement is called Koro movement. In the state where the fixture with spring is fixed on the two rails as shown in Fig.2, the people can step on the board and plantar flex and dorsiflex the ankle joints. That movement is called Pata movement. The measurement range in the forward and backward direction is 565mm and that in the right and left direction is 105mm. The spring constant used in Pata movement is about 0.52N/mm. The experimental apparatus is made of electromyography (EMG), the Patakoro rehabilitation device, and the device that can measure a knee angle change as shown in Fig.3. Through an A/D converter, the EMG data and knee angle data can be collected at the same time by PC. Fig.2 Device for Pata movement Fig.1 Device for Koro movement spring

<b>A study of the relationship between muscles and sitting positions </b><b>using a rehabilitation device </b>