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Simulation and analysis of the electromyographic interference pattern in normal muscle. Part II: Activity, upper centile amplitude, and number of small segments.

Publication ,  Journal Article
Nandedkar, SD; Sanders, DB; Stålberg, EV
Published in: Muscle Nerve
1986

We have defined three new features of the electromyographic (EMG) interference pattern (IP): activity, upper centile amplitude (UCA), and number of small segments (NSS). These parameters were measured in simulated IPs constructed by adding together motor unit action potentials (MUAPs) recorded with a concentric needle EMG electrode. The activity increases linearly with the number of MUAP discharges to approximately 80% of its theoretical maximum value. The UCA correlates strongly with the peak-to-peak amplitude of the largest MUAP in the IP and the mean segment amplitude and does not depend on the discharge rate of the largest MUAPs. We infer that the UCA defines the upper limit of the peak-to-peak amplitude of the MUAPs contained in the IP. The NSS increases with the number of MUAP discharges, but reaches a constant value at higher MUAP discharge rates, probably because small amplitude MUAPs are masked by the large amplitude MUAPs. The potential value of these parameters in automated IP analysis is discussed.

Duke Scholars

Published In

Muscle Nerve

DOI

ISSN

0148-639X

Publication Date

1986

Volume

9

Issue

6

Start / End Page

486 / 490

Location

United States

Related Subject Headings

  • Reference Values
  • Neurology & Neurosurgery
  • Muscles
  • Motor Neurons
  • Middle Aged
  • Male
  • Humans
  • Female
  • Electromyography
  • Adult
 

Citation

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MLA
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Nandedkar, S. D., Sanders, D. B., & Stålberg, E. V. (1986). Simulation and analysis of the electromyographic interference pattern in normal muscle. Part II: Activity, upper centile amplitude, and number of small segments. Muscle Nerve, 9(6), 486–490. https://doi.org/10.1002/mus.880090603
Nandedkar, S. D., D. B. Sanders, and E. V. Stålberg. “Simulation and analysis of the electromyographic interference pattern in normal muscle. Part II: Activity, upper centile amplitude, and number of small segments.Muscle Nerve 9, no. 6 (1986): 486–90. https://doi.org/10.1002/mus.880090603.
Nandedkar, S. D., et al. “Simulation and analysis of the electromyographic interference pattern in normal muscle. Part II: Activity, upper centile amplitude, and number of small segments.Muscle Nerve, vol. 9, no. 6, 1986, pp. 486–90. Pubmed, doi:10.1002/mus.880090603.
Journal cover image

Published In

Muscle Nerve

DOI

ISSN

0148-639X

Publication Date

1986

Volume

9

Issue

6

Start / End Page

486 / 490

Location

United States

Related Subject Headings

  • Reference Values
  • Neurology & Neurosurgery
  • Muscles
  • Motor Neurons
  • Middle Aged
  • Male
  • Humans
  • Female
  • Electromyography
  • Adult