Development of an ambulatory physical activity memory device and its application for the categorization of actions in daily life.

In this study, we developed an ambulatory physical activity memory device by equipping piezoresistive accelerometers with a portable digital biosignal memory device which we had previously developed. This ambulatory physical activity memory device can record our physical activity and posture in daily life. We also tried to categorize the acceleration data acquired by this device as individual actions in daily life; walking, standing, sitting, lying, getting in a vehicle and so on.