Principal component analysis of the features of concentric needle EMG motor unit action potentials.

Journal Article (Journal Article)

Motor unit action potentials (MUAPs) were recorded from the biceps muscle of normal subjects and of patients with nerve or muscle diseases. Principal component analysis of the MUAP amplitude, area, area/amplitude ratio, duration, and the number of turns and phases produced three components that among them contained 90% of the variance of the data set. Thus the dimensionality of data was reduced from six to three. The first component reflected changes in the size of the MU, whereas the second reflected variations in the arrival time at the recording electrode of the action potentials of muscle fibers in the motor unit. The third factor reflected local loss of muscle fibers within the MU territory. Patterns of variations in the three components were different in patients with neuropathy and myopathy.

Full Text

Duke Authors

Cited Authors

  • Nandedkar, SD; Sanders, DB

Published Date

  • April 1989

Published In

Volume / Issue

  • 12 / 4

Start / End Page

  • 288 - 293

PubMed ID

  • 2770781

Pubmed Central ID

  • 2770781

International Standard Serial Number (ISSN)

  • 0148-639X

Digital Object Identifier (DOI)

  • 10.1002/mus.880120406


  • eng

Conference Location

  • United States