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Premotor potentials

J D Mandel1

  • 1Department of Physical Medicine and Rehabilitation, Zablocki VA Medical Center, Milwaukee, Wisconsin, USA.

Physical Medicine and Rehabilitation Clinics of North America
|January 20, 1999
PubMed
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Premotor potentials, preceding nerve conduction study muscle action potentials, are explained. Their electrophysiologic origin was determined using volume conduction principles, clarifying their significance.

Area of Science:

  • Neurophysiology
  • Electromyography
  • Nerve Conduction Studies

Background:

  • Premotor potentials are often overlooked during electromyography.
  • These potentials precede median or ulnar compound muscle action potentials (CMAPs) in motor nerve conduction studies.
  • Their origin has been a subject of longstanding debate within the field.

Purpose of the Study:

  • To provide a chronological review of premotor potentials.
  • To elucidate the electrophysiologic origin of premotor potentials.
  • To address the clinical significance of these potentials.

Main Methods:

  • Review of historical data and literature on premotor potentials.
  • Analysis of premotor potentials using volume conduction principles.

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  • Standard motor nerve conduction studies with high amplification.

    • Main Results:

    • Premotor potentials are identifiable at high amplification before median or ulnar CMAPs.
    • Volume conduction principles were employed to determine the electrophysiologic origin.
    • The significance of these potentials in nerve conduction studies is clarified.

    Conclusions:

    • The electrophysiologic origin of premotor potentials has been definitively determined.
    • Understanding premotor potentials enhances the interpretation of nerve conduction studies.
    • Further research into their clinical implications is warranted.