Estimation of Activity Energy Expenditure According to the Position of User´s Smart Phone

Energy expenditure of a person closely corresponds to the amount of physical activity. Recently, due to the advance in sensor and electronic technology, we can measure physical activity using portable electronic devices. Smart phones are well equipped with useful sensors such as accelerometers and orientation. In this paper, we present estimation method of activity energy expenditure using a smart phone and use the accelerometer inside a smart phone as a sensitive element able to identify activity.