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Circadian rhythm in rat H-reflex

X Y Chen1, J R Wolpaw

  • 1Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany.

Brain Research
|June 13, 1994
PubMed
Summary

Soleus H-reflex amplitude in rats shows significant daily variation, peaking in the morning and lowest at midnight. This diurnal rhythm, opposite to primates, highlights time-of-day effects on central nervous system activity and motor function studies.

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Motor Control

Background:

  • The H-reflex is a measure of spinal cord reflex excitability.
  • Circadian rhythms influence various physiological processes, but their impact on H-reflex is less understood in rats.

Purpose of the Study:

  • To investigate the diurnal variation of soleus H-reflex amplitude in Sprague-Dawley rats.
  • To determine if time of day is a confounding factor in motor function studies in rats.

Main Methods:

  • Soleus H-reflex was measured in Sprague-Dawley rats.
  • Measurements were taken across different times of the day.
  • Background electromyography (EMG) and M-response amplitude were monitored for stability.

Main Results:

  • H-reflex amplitude exhibited significant diurnal variation.
  • The H-reflex was largest in the late morning and smallest around midnight.
  • Background EMG and M-response amplitude remained stable throughout the day.

Conclusions:

  • The rat H-reflex displays a diurnal rhythm, opposite in phase to that observed in primates.
  • This time-of-day variation can be a confounding factor in motor function research.
  • The findings suggest that central nervous system activity underlying motor performance fluctuates diurnally.

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