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Decrease in motor cortical excitability in human subjects after sleep deprivation.

P Manganotti1, A Palermo, S Patuzzo

  • 1Section of Neurological Rehabilitation, Department of Neurological and Visual Sciences, Hospital Giambattista Rossi, University of Verona, Verona, Italy. paolomanganotti@yahoo.com

Neuroscience Letters
|May 10, 2001
PubMed
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Sleep deprivation increases motor threshold and intracortical inhibition, impacting motor cortical excitability. These effects on the nervous system return to normal by morning.

Area of Science:

  • Neuroscience
  • Sleep Science
  • Motor Control

Background:

  • Sleep deprivation is a common issue with potential neurological consequences.
  • Understanding its impact on motor control is crucial for public health and safety.
  • Motor cortical excitability changes may underlie performance decrements during sleep loss.

Purpose of the Study:

  • To investigate the effects of sleep deprivation on human motor cortical excitability.
  • To quantify changes in various neurophysiological parameters related to motor control.
  • To determine the temporal dynamics of these changes over a 24-hour period.

Main Methods:

  • Seven healthy subjects participated in the study.
  • Motor evoked potentials (MEPs) were recorded from the thenar eminence muscles.

Related Experiment Videos

  • Parameters assessed included motor threshold, MEP amplitude, silent period, intracortical inhibition, intracortical facilitation, and F wave.
  • Recordings were taken at regular intervals over 24 hours, with increased frequency during nighttime.

    • Main Results:

    • Significant increases in motor threshold, intracortical inhibition, and silent period were observed during nighttime recordings.
    • These neurophysiological changes returned to baseline levels by the morning.
    • No significant alterations were found in motor evoked potential amplitude, intracortical facilitation, or F wave parameters.

    Conclusions:

    • Sleep deprivation appears to enhance intracortical motor inhibition.
    • This enhanced inhibition may be the primary mechanism explaining the observed effects of sleep loss on motor cortical excitability.
    • The findings suggest a specific impact of sleep deprivation on inhibitory pathways within the motor cortex.