Abstract
Increasing attention is being paid to the research of heart-rate-based training to improve the safety and efficiency of exercises. The present study develops a walking and running exercise training system, which is able to provide a more human friendly way to adjust exercise intensity by measuring user's heart rate in real-time. Specifically, the proposed training system makes it possible for the user to control the speed of the treadmill based on the results of heart rate analysis. Two types of exercise intensity adjustment approaches are tested by four health human subjects. From the frequency analysis of heart rates, it was found that, for the same type of intensity adjustment, the subjects may feel different stress with respect to whether he/she has been used to do exercise or not.