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Related Experiment Videos

Clonidine and sympathetic activity during sleep.

T J Maling, C T Dollery, C A Hamilton

    Clinical Science (London, England : 1979)
    |December 1, 1979
    PubMed
    Summary

    Slow-release clonidine effectively lowered systolic blood pressure and reduced paradoxical sleep duration in healthy males. Plasma noradrenaline levels also decreased significantly after clonidine administration during sleep.

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    Area of Science:

    • Cardiovascular Physiology
    • Sleep Medicine
    • Neuropharmacology

    Background:

    • Sleep significantly influences cardiovascular regulation.
    • Noradrenaline plays a key role in both blood pressure control and sleep architecture.
    • Clonidine is an alpha-2 adrenergic agonist with known hypotensive and sedative effects.

    Purpose of the Study:

    • To investigate the effects of slow-release clonidine on cardiovascular variables and sleep patterns during sleep.
    • To assess the impact of clonidine on plasma noradrenaline levels during sleep.

    Main Methods:

    • Simultaneous measurement of blood pressure, heart rate, plasma noradrenaline, and electroencephalographic (EEG) variables in five healthy males.
    • Administration of slow-release clonidine (300 micrograms orally) or placebo.
    • Data collection before and after treatment during sleep.

    Main Results:

    • A significant correlation was observed between the fall in blood pressure during sleep and sleep depth.
    • Clonidine administration led to a significant reduction in systolic blood pressure during sleep.
    • Total duration of paradoxical sleep (REM sleep) was profoundly reduced by clonidine.
    • Plasma noradrenaline concentrations declined progressively during sleep and were significantly lower following clonidine compared to placebo.

    Conclusions:

    • Slow-release clonidine effectively reduces systolic blood pressure and paradoxical sleep during sleep in healthy individuals.
    • Clonidine's hypotensive effect during sleep may be linked to reduced sympathetic outflow, as indicated by lower plasma noradrenaline levels.
    • These findings highlight clonidine's impact on both cardiovascular regulation and sleep architecture, suggesting a role for noradrenergic pathways.

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