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Microcomputer servo-controlled bicycle ergometer system for psychophysiological research.

A R Laperriere, D H VanDercar, L Y Shyu

    Psychophysiology
    |March 1, 1989
    PubMed
    Summary
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    A new microcomputer-controlled bicycle ergometer precisely maintains target heart rates during steady-state exercise. This system offers a reliable method for psychophysiological studies and may estimate aerobic fitness levels.

    Area of Science:

    • Exercise Physiology
    • Biomedical Engineering
    • Psychophysiology

    Background:

    • Steady-state exercise is crucial for psychophysiological research requiring consistent heart rate monitoring.
    • Existing methods for maintaining a constant heart rate during exercise can be imprecise, especially across varying fitness levels.

    Purpose of the Study:

    • To develop and evaluate a microcomputer servo-controlled bicycle ergometer system for precise steady-state exercise.
    • To assess the system's ability to maintain a predetermined heart rate regardless of individual fitness levels (VO2max).

    Main Methods:

    • A servo-controlled bicycle ergometer system was developed using a feedback loop to automatically adjust workload.
    • Fourteen healthy males with diverse VO2max levels underwent exercise at a fixed workload or a servo-heart rate (122 bpm).

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  • Heart rate variability was compared between the fixed workload and servo-heart rate conditions.

    • Main Results:

    • The servo-heart rate system maintained heart rate within 3 bpm of the target, significantly more accurate than the fixed workload (17 bpm variation, p < .05).
    • The system effectively controlled heart rate across a range of subject fitness levels.
    • A strong correlation (r = .85, p < .05) was found between VO2max and the workload required to maintain the target heart rate during servo-heart rate exercise.

    Conclusions:

    • The microcomputer servo-controlled bicycle ergometer accurately maintains target heart rates during steady-state exercise.
    • This technology provides a reliable tool for psychophysiological studies.
    • The workload required to maintain a constant heart rate may serve as an index of aerobic fitness.