Normal needle electromyographic insertional: A clinical and simulation study

Daniel Dumitru, John C. King, Dick F. Stegeman

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Needle electromyographic insertional activity waveform morphology, and mechanisms of generation, have received little attention. This study analyzes the individual component waveforms that contribute b the burst of electrical activity known as insertional activity. One hundred monopolar needle insertions were slowly performed and high speed recorded to allow better separation of the contributing individual component waveforms. Analysis of the many waveforms recorded demonstrates several classes of potentials. All of these could be reconstructed by the summation of two basic or elementary waveform patterns: a biphasic initially negative spike with or without a 'prepotential' similar to an end-plate spike, and the biphasic initially positive spike with a slowly declining negative phase, similar to a positive sharp wave, though shorter in duration. The relationship between these elementary waveforms and their hypothesized generator sources discussed.

Original languageEnglish (US)
Pages (from-to)910-920
Number of pages11
JournalMuscle and Nerve
Issue number7
StatePublished - Jul 1998


  • Insertional activity
  • Needle electrode
  • Needle electromyography
  • Single muscle fiber
  • Volume conduction

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


Dive into the research topics of 'Normal needle electromyographic insertional: A clinical and simulation study'. Together they form a unique fingerprint.

Cite this