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Related Experiment Videos

A short-term memory in the respiratory centres: statistical analysis.

G Benchetrit, F Bertrand

    Respiration Physiology
    |March 1, 1975
    PubMed
    Summary

    Respiratory cycle characteristics show serial dependence, indicating each breath influences the next. This suggests an intrinsic property of the central respiratory oscillator, independent of external feedback mechanisms.

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    Area of Science:

    • Neuroscience
    • Respiratory Physiology

    Background:

    • Previous studies indicate human respiratory cycle depth and duration are not independent random variables.
    • The central respiratory oscillator's inherent properties may explain this observed serial dependence.

    Purpose of the Study:

    • To investigate if serial dependence in respiratory cycle characteristics stems from the central respiratory oscillator.
    • To analyze respiratory data in an isolated respiratory center preparation to understand intrinsic control mechanisms.

    Main Methods:

    • Utilized an "isolated respiratory centre" preparation in cats (spinalized, bivagotomized, curarized, artificially ventilated).
    • Recorded integrated phrenic discharge per breath (S), inspiratory duration (TI), expiratory duration (TE), and total cycle duration (T).
    • Applied statistical time series analysis to data collected at rest, during hypercapnia, and hyperthermia.

    Main Results:

    • Successive values within each respiratory data series (S, TI, TE, T) were found to be dependent, suggesting a cycle influences the next.
    • Expiratory duration (TE) depended on preceding inspiratory duration (TI), and vice versa, though this was not observed under hypercapnia/hyperthermia.
    • A positive correlation between phrenic discharge amplitude (S) and inspiratory duration (TI) was identified, indicating simultaneous adjustment in the absence of vagal feedback.

    Conclusions:

    • The central respiratory oscillator exhibits inherent serial dependence in regulating respiratory cycle characteristics.
    • Respiratory cycle parameters are not independent, with preceding cycles influencing subsequent ones.
    • The phrenic neurogram amplitude and inspiratory duration are coupled, demonstrating intrinsic coordination within the respiratory control system.

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