Abstract
In the blood pressure measurement, the auscultatory method that is standard and an easier method using the automatic sphygmomanometer are used widely. It is known that the measurement results by the two methods above are sometimes rather different. In order to investigate the difference, a linear model with single degree of freedom was made for the structure from the blood vessel wall to the cuff in this study. The model has time varying coefficients because the blood vessel expands and contracts periodically and the method to identify them was also proposed. The coefficients calculated by using the experimental data showed periodic tendency.
