Robust control of heart rate for cycle ergometer exercise

Hunt, Kenneth James; Hurni, Cédric C. (2019). Robust control of heart rate for cycle ergometer exercise Medical & Biological Engineering & Computing, 57(11), pp. 2471-2482. Springer 10.1007/s11517-019-02034-6

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The objective was to assess the performance and robustness of a novel strategy for automatic control of heart rate (HR) during cycle ergometry. Control design used a linear plant model and direct shaping of the closed-loop input-sensitivity function to achieve an appropriate response to disturbances attributable to broad-spectrum heart rate variability (HRV). The controller was evaluated in 73 feedback control experiments involving 49 participants. Performance and stability robustness were analysed using a separately identified family of 73 plant models. The controller gave highly accurate and stable HR tracking performance with mean root-mean-square tracking error between 2.5 beats/min (bpm) and 3.1 bpm, and with low average control signal power. Although plant parameters varied over a very wide range, key closed-loop transfer functions remained invariant to plant uncertainty in important frequency bands, while infinite gain margins and large phase margins (>62◦) were preserved across the whole plant model family. Highly accurate, stable and robust HR control can be achieved using LTI controllers of remarkably simple structure. The results highlight that HR control design must focus on disturbances caused by HRV. The input-sensitivity approach evaluated in this work provides a transparent method of addressing this challenge.

Item Type:

Journal Article (Original Article)

Division/Institute:

Engineering and Information Technology > Institut für Rehabilitation und Leistungstechnologie IRPT
BFH Centres > BFH Centre for Technologies in Sports and Medicine

Name:

Hunt, Kenneth James and
Hurni, Cédric C.

Subjects:

T Technology > TA Engineering (General). Civil engineering (General)

ISSN:

1741-0444

Publisher:

Springer

Language:

English

Submitter:

Kenneth James Hunt

Date Deposited:

30 Oct 2019 10:28

Last Modified:

10 Nov 2019 01:31

Publisher DOI:

10.1007/s11517-019-02034-6

ARBOR DOI:

10.24451/arbor.8708

URI:

https://arbor.bfh.ch/id/eprint/8708

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