title: Development of a servo-controller of heart rate using a cycle ergometer.
abstract: In exercise training, precise control of exercise intensity would maximize the training efficacy while minimizing risks. To adjust work rate, heart rate (HR) has been used as a measure of exercise intensity. Thus, we developed a servo-controller of HR using a cycle ergometer. After estimating the transfer 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 healthy volunteers. We set the target HR at 60% and 75% of the age-predicted maximum HR. Times required for HR to reach 90% of the target HR were 136 +/- 33 and 137 +/-22s 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-controller makes it possible to precisely regulate HR and, thereby, exercise intensity.
authors.affiliation: Department of Cardiovascular Dynamics, National Cardiovascular Center Research Institute, Osaka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kawada
authors.forename: Y
authors.initials: Y
authors.lastname: Ikeda
authors.forename: H
authors.initials: H
authors.lastname: Takaki
authors.forename: M
authors.initials: M
authors.lastname: Sugimachi
authors.forename: O
authors.initials: O
authors.lastname: Kawaguchi
authors.forename: T
authors.initials: T
authors.lastname: Shishido
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: W
authors.initials: W
authors.lastname: Matsuura
authors.forename: H
authors.initials: H
authors.lastname: Miyano
authors.forename: K
authors.initials: K
authors.lastname: Sunagawa
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000295:instrumentation*; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008955:Models, Cardiovascular; D009203:Myocardial Infarction / Q000534:rehabilitation*; D013813:Therapy, Computer-Assisted / Q000295:instrumentation*