Bispectral Analysis of Needle EMG Signals to Detect Differential Patterns of Muscle Activity in Radiculopathy Patients

Publish Year: 1392
نوع سند: مقاله کنفرانسی
زبان: English
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تاریخ نمایه سازی: 3 آذر 1392


Radiculopathy refers to a set of conditions, in which one or more nerves is affected and does not work properly. The emphasis is, however, on the nerve roots. In addition, L5 radiculopathy is the most common radiculopathy encountered in electrodiagnostic laboratories. Needle electrode examination is known to be the most effective diagnostic tool for this disorder. The objective of the present study was to quantify muscular changes in radiculopathy patients, using needle EMG signals recorded from tibialis anterior muscle of a healthy man without a history of neuromuscular disease and a man with neuropathy due to L5 radiculopathy. Moreover, this paper investigated the utility of HOS analysis by examining bispectral patterns and extracting features based on amplitude and phase of the bispectrum for identifying the differences. The results showed that the mean value of amplitude based features were higher in patient compared with those of healthy control. However, phase entropy indicated a reduction in radiculopathy patient. In addition, bispectral magnitude contour plots enabled us to visually differentiate muscle activities.


bispectrum , entropy , higher order spectra (HOS) , needle EMG , radiculopathy


Fariba Biyouki

Islamic Azad University Mashhad Branch

Saeed Rahati

Islamic Azad University Mashhad Branch

Katri Laimi

Turku University Hospital

Ali Shoeibi

Mashhad University of Medical Sciences

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