Summary
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.
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This study was supported by Research Grants for Cardiovascular Diseases (6A-4, 7C-2, 7A-1, 9C-1) from the Ministry of Health and Welfare of Japan, by a grant from the Science and Technology Agency of Japan, Encourage System of COE, by a grant from the Ministry of Health and Welfare of Japan, Research on Advanced Medical Technology, and by a grant from the Fukuda Foundation for Medical Technology.
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Kawada, T., Ikeda, Y., Takaki, H. et al. Development of a servo-controller of heart rate using a cycle ergometer. Heart Vessels 14, 177–184 (1999). https://doi.org/10.1007/BF02482304
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DOI: https://doi.org/10.1007/BF02482304