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Related Experiment Videos

Changes in human diaphragmatic electromyogram with positive pressure breathing.

D K McKenzie, S C Gandevia

    Neuroscience Letters
    |September 25, 1986
    PubMed
    Summary

    Positive airway pressure may increase diaphragmatic electromyogram (EMG) readings due to changes in recording conditions, not necessarily increased neural outflow to the diaphragm. This finding impacts respiratory muscle research.

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    Area of Science:

    • Respiratory Physiology
    • Neurophysiology

    Background:

    • Diaphragmatic electromyogram (EMG) increases during positive pressure breathing are often interpreted as heightened neural outflow.
    • Accurate assessment of respiratory drive is crucial for understanding respiratory control.

    Purpose of the Study:

    • To investigate whether increased diaphragmatic EMG during positive airway pressure reflects true neural outflow changes or altered recording conditions.
    • To differentiate between central respiratory drive and measurement artifacts.

    Main Methods:

    • Recording diaphragmatic EMG via oesophageal electrodes during positive pressure breathing.
    • Measuring compound muscle action potentials from phrenic nerve stimulation under similar conditions.

    Main Results:

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    • Compound muscle action potential size also increased during positive pressure breathing.
    • This suggests that recording conditions, not central respiratory outflow, may explain EMG changes.

    Conclusions:

    • Observed increases in diaphragmatic EMG during positive airway pressure may be influenced by changes in recording conditions.
    • This challenges the assumption that EMG increases directly correlate with neural outflow in this context.