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Neural drives to breathing during exercise

J Duffin1

  • 1Department of Physiology, University of Toronto, Ontario.

Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee
|September 1, 1994
PubMed
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Exercise ventilation changes are driven by limb movement frequency and motor commands. Rapid breathing shifts link to limb movement, while excessive increases above the first ventilatory threshold relate to motor command strength during intense exercise.

Area of Science:

  • Exercise Physiology
  • Respiratory Control
  • Neuroscience

Background:

  • Understanding the neural control of breathing during exercise is crucial for interpreting physiological responses.
  • Previous research has explored various factors influencing ventilation, but specific neural drives remain debated.

Purpose of the Study:

  • To propose and examine two distinct neural drives influencing breathing during physical activity.
  • To investigate the relationship between limb movement frequency and rapid ventilation changes.
  • To explore the link between motor commands and ventilation exceeding the first ventilatory threshold.

Main Methods:

  • Analysis of ventilation patterns at the onset and cessation of exercise.
  • Monitoring of electromyographical (EMG) activity in working muscles during incremental exercise tests.

Related Experiment Videos

  • Correlation of ventilation data with limb movement frequency and muscle EMG activity.

    • Main Results:

    • A fast neural drive, linked to limb movement frequency, influences rapid ventilation changes at exercise initiation and termination.
    • This fast neural drive is present throughout exercise but diminishes over time.
    • Ventilation increases beyond the first ventilatory threshold correlate with the strength of motor commands to exercising muscles, as indicated by EMG activity.

    Conclusions:

    • Two primary neural drives contribute to exercise ventilation: a movement-frequency-dependent drive for rapid adjustments and a motor-command-dependent drive for excessive ventilation.
    • The findings provide a framework for understanding the neural regulation of breathing during different exercise intensities.
    • Electromyography serves as a valuable index for assessing motor command strength and its impact on respiratory control during exercise.