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Related Experiment Videos

Forced oscillations in sympathetic nerve discharge.

Z S Huang1, G L Gebber, S Zhong

  • 1Department of Pharmacology and Toxicology, Michigan State University, East Lansing 48824-1317.

The American Journal of Physiology
|September 1, 1992
PubMed
Summary

Electrical stimulation of cat brains revealed that sympathetic nerve discharge (SND) rhythms are controlled by coupled nonlinear oscillators. These findings suggest complex neural network dynamics govern cardiovascular regulation.

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Area of Science:

  • Neuroscience
  • Physiology
  • Systems Biology

Background:

  • Sympathetic nerve discharge (SND) exhibits distinct rhythmic patterns.
  • Understanding the central control mechanisms of these rhythms is crucial for cardiovascular regulation.

Purpose of the Study:

  • To investigate the central nervous system's control over 10-Hz and 2- to 6-Hz rhythms in sympathetic nerve discharge (SND).
  • To model the neural circuits responsible for generating these SND rhythms.

Main Methods:

  • Periodic electrical stimulation of the medullary raphe or lateral tegmental field in baroreceptor-denervated cats.
  • Analysis of entrainment of 10-Hz and 2- to 6-Hz rhythms in post-ganglionic sympathetic nerve discharge (SND) to stimulus frequencies and harmonics.

Main Results:

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  • The 10-Hz rhythm in SND could be entrained to the stimulus frequency or its harmonics, with potential differences across nerves.
  • The 2- to 6-Hz component of SND could be driven into a stable oscillation by medullary stimulation between 3 and 5 Hz.
  • These results support a model of coupled nonlinear oscillators for the 10-Hz rhythm and a nonlinear oscillator for the 2- to 6-Hz component.

Conclusions:

  • The neural circuits generating 10-Hz SND rhythms can be modeled as a system of coupled nonlinear oscillators.
  • The 2- to 6-Hz component of SND likely arises from a nonlinear oscillator, not physiological noise.
  • These findings provide insights into the complex neural dynamics underlying sympathetic nerve activity.