Development of system for unrestrained measurement of vital signs in the bathroom

This paper describes an unrestrained measurement system of the vital signs of a person in the bathroom. Here, the vital signs are given by the heartbeat and respiration. In the measurement of the sign, a physical change can be detected while the person is in a bath. The proposed method uses a bathtub pillow in which a low-frequency microphone is installed and a piezoelectric ceramic sensor placed under a duckboard. This measurement system causes no discomfort to the subject. The load on the body while bathing and the health condition can be detected by the measurement, which reduces the risk of accidents in the bathroom.