Development of a servo-controller of heart rate using a cycle ergometer

In exercise training, precise control of exercise intensity would maximize the training efficacy while minimizing risks. To adjust work rate, heart ra te (HR) has been used as a measure of exercise intensity. Thus, we develope d a servo-controller of HR using a cycle ergometer. After estimating the tr ansfer function from work rate to HR, we optimized feedback parameters for achieving a quick and stable HR response by means of a computer simulation. We then examined the performance of the servo-controller of HR in 55 healt hy volunteers. We set the target HR at 60% and 75% of the age-predicted max imum HR. Times required for HR to reach 90% of the target HR were 136 +/- 3 3 and 137 +/- 22 s in the respective protocols. Standard deviations of the steady-state difference between the target and measured HRs were 2.5 +/- 0. 6 and 3.8 +/- 1.1 beats/min. We conclude that the developed servo-controlle r makes it possible to precisely regulate HR and, thereby, exercise intensi ty.