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Sympathetic rhythms and nervous integration.

Michael P Gilbey1

  • 1Department of Physiology, University College London, London, UK. m.gilbey@ucl.ac.uk

Clinical and Experimental Pharmacology & Physiology
|February 28, 2007
PubMed
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Rhythmic sympathetic nerve activity influences cardiovascular function. Central and peripheral mechanisms generate these rhythms, impacting nervous integration and potentially spinal cord oscillators.

Area of Science:

  • Neuroscience
  • Cardiovascular Physiology

Background:

  • Sympathetic nerves play a crucial role in regulating cardiovascular functions.
  • Rhythmic discharges in sympathetic nerves are observed but their underlying mechanisms and functional significance are not fully understood.
  • Understanding these rhythms is key to comprehending nervous integration.

Purpose of the Study:

  • To review processes generating sympathetic nerve rhythms influencing cardiovascular functions.
  • To explore mechanisms responsible for rhythmic sympathetic discharges.
  • To discuss the relevance of sympathetic rhythms to nervous integration.

Main Methods:

  • Review of existing literature on neuronal mechanisms generating sympathetic rhythms.
  • Analysis of evidence for peripheral and central origins of rhythmic sympathetic activity.

Related Experiment Videos

  • Utilizing the rat tail model to study sympathetic activity rhythms and their modulation.

    • Main Results:

    • Two primary mechanisms for rhythmic sympathetic discharges are identified: peripheral/central neuronal excitation/inhibition and intrinsic central network rhythms.
    • Evidence suggests both mechanisms operate, with peripheral in muscle and central in skin vasoconstrictor networks.
    • The T-rhythm in rat tail sympathetic activity (0.4-1.2 Hz) is modulated by thermoregulation and fear/arousal, and may be generated in the spinal cord.

    Conclusions:

    • Sympathetic rhythms are generated by distinct mechanisms influencing cardiovascular control.
    • The T-rhythm provides insights into how neuronal population rhythms are dynamically synchronized.
    • Spinal cord oscillators may be involved in generating and modulating sympathetic rhythms, impacting transmission efficacy.