2012 年 50 巻 1 号 p. 23-30
Recently, in order to achieve the prevention or early detection of diseases, many studies have been carried out to measure physiological information in everyday life. The purpose of this study is to develop the mat-type device to measure physiological information fro6m the sole. ECG (Electrocardiogram) and PPG (Photoplethysmogram) that are the indices of the cardiovascular system were adopted as physiological information. ECG is measured by conductive coupling without using the paste and capacitive coupling that is able to obtain ECG and PPG with socks. PPG is obtained by measuring the reflected light to incident infrared light at periphery. PWV (Pulse wave velocity) which is the index of the arteriosclerosis is able to be calculated from ECG and PPG. The subjective experiment reveals that the developed system can measure ECG and PPG. In addition, the system can measure ECG and PPG in case of wearing socks. Moreover, by simultaneous measurement of blood pressure, PWV was calculated by the developed system and the good correlation was found between PWV and blood pressure. In addition, the experiment showed that the PWV were changed with the blood pressure changes due to exercise. Therefore, result of this experiment showed this system has the potential to monitor the condition of cardiovascular system, and suggested the possibility to estimate the blood pressure without compression by the cuff.