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Related Experiment Videos

Heart rate changes with exercise and voluntary heart rate acceleration.

D Carroll, L Rhys-Davies

    Biological Psychology
    |June 1, 1979
    PubMed
    Summary

    This study found that physical exertion, especially isotonic exercise, significantly increases heart rate (HR). Voluntary HR control improved with feedback, linking exercise-induced HR changes to voluntary acceleration.

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    Area of Science:

    • Cardiovascular Physiology
    • Exercise Physiology
    • Autonomic Nervous System Function

    Background:

    • Heart rate (HR) regulation involves complex autonomic nervous system (ANS) control.
    • Understanding the interplay between physical exertion and voluntary HR modulation is crucial for physiological research.
    • Previous studies have explored HR responses to exercise but less is known about their predictive value for voluntary HR control.

    Purpose of the Study:

    • To investigate the relationship between HR changes during isometric and isotonic exercises and HR changes during attempted voluntary HR acceleration.
    • To determine the influence of feedback on voluntary HR acceleration.
    • To explore the role of respiration and electromyography (EMG) in voluntary HR control.

    Main Methods:

    • Participants performed isometric and isotonic exercises while HR was monitored.
    • Participants attempted to voluntarily increase their HR, with and without auditory feedback.
    • Respiration rate and EMG activity were recorded during voluntary HR acceleration attempts.

    Main Results:

    • Both isometric and isotonic exercises induced significant HR increases, with isotonic exercise causing greater changes.
    • Voluntary HR acceleration was enhanced when participants received feedback compared to instructions alone.
    • Exercise-induced HR changes predicted voluntary HR increase magnitude only when feedback was provided.
    • Respiration rate changes strongly correlated with HR changes during voluntary acceleration and isotonic exercise, but not isometric exercise.
    • No significant EMG changes were observed during attempted voluntary HR acceleration.

    Conclusions:

    • Autonomic regulation of HR during exercise may influence the capacity for voluntary HR control, particularly with sensory feedback.
    • Feedback appears to be a critical factor in leveraging exercise-induced physiological changes for voluntary HR modulation.
    • Respiration plays a significant role in HR variability during certain types of exertion and voluntary control, suggesting a link between respiratory and cardiac centers.

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