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    Area of Science:

    • Neuroscience
    • Physiology
    • Sleep Studies

    Background:

    • Ventilation and brain blood flow (BBF) interact dynamically during sleep.
    • Understanding these relationships is crucial for respiratory control research.

    Purpose of the Study:

    • To investigate the interplay between ventilation (VI) and BBF during different sleep stages (SWS and REM) in goats.
    • To elucidate the regulatory mechanisms of BBF during sleep.

    Main Methods:

    • Continuous unilateral BBF measurement using an electromagnetic flow probe.
    • Total and regional BBF assessment via radioactive microsphere technique.
    • Arteriovenous oxygen difference measurement in goats with sagittal sinus fistulae.

    Main Results:

    • During slow wave sleep (SWS), decreased VI and increased PaCO2 correlated with increased BBF.
    • During REM sleep, VI decreased, while BBF significantly increased beyond predictions from PaCO2.
    • Brain oxygen consumption remained similar between wakefulness and REM sleep, indicating BBF excess.

    Conclusions:

    • SWS BBF increases are explained by hypoventilation and hypercapnia.
    • REM sleep BBF elevation is not solely due to metabolic demand or PaCO2.
    • Excessive REM sleep BBF may alter central chemoreceptor pH, potentially contributing to reduced respiratory drive and irregularities.