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Related Experiment Videos

Somatosensory evoked potential changes during muscle testing.

G Leisman1, P Shambaugh, A H Ferentz

  • 1Neuroscience Institute, New York Chiropractic College, Glen Head 11545.

The International Journal of Neuroscience
|March 1, 1989
PubMed
Summary

Manual muscle testing revealed distinct neurological responses. Recordings showed increased amplitudes when testing weak muscles, suggesting a neurological basis for manual muscle testing assessments.

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Area of Science:

  • Neuroscience
  • Physiology
  • Clinical assessment

Background:

  • Manual muscle testing (MMT) is a common clinical assessment tool.
  • The underlying neurological mechanisms of MMT are not fully understood.
  • Previous research has not objectively measured neurological responses during MMT.

Purpose of the Study:

  • To investigate the neurological correlates of manual muscle testing.
  • To determine if MMT elicits measurable changes in neurophysiological signals.
  • To explore the potential neurological basis for differentiating strong and weak muscles.

Main Methods:

  • Fifteen healthy subjects underwent manual muscle testing to identify two strong and one weak muscle.
  • Somatosensory evoked potentials (SEP) were recorded following median nerve stimulation.

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  • SEP recordings were compared during baseline, strong muscle testing, and weak muscle testing.

    • Main Results:

    • SEP recordings during baseline and strong muscle testing were comparable.
    • Testing of the identified weak muscle resulted in significantly increased SEP amplitudes.
    • Increased amplitudes were observed in contralateral components of the SEP.

    Conclusions:

    • Manual muscle testing appears to have a neurological basis.
    • Objective neurophysiological changes correlate with the perceived strength of a muscle during MMT.
    • These findings support the validity of MMT as a clinical assessment tool.