Torso muscle EMG profile differences between patients of back pain and control

Clinical Biomechanics
Shrawan Kumar, Narsimha Prasad

Abstract

Electrophysiological criteria that identify and characterize low back pain can lead to better understanding of the affliction and possibly aid in its treatment. Nineteen male and 22 female subjects with chronic back pain, without lumbar radiculopathy; and 30 male and 33 female control subjects with no history of low back pain in the last 12 months, were recruited into the study. All subjects flexed, extended, laterally flexed, flexed anterolaterally and extended posterolaterally isometrically to 20% and 100% of their maximal voluntary contraction (MVC). Additionally, patients were asked to do these activities to their pain threshold levels and control subjects to 60% maximum voluntary contraction. Surface electromyograms (EMG) were recorded from lumbar erectores spinae, external obliques and rectus abdominis bilaterally. The electromyogram was subjected to magnitude, Fast Fourier Transform, and wavelet analyses. The median frequency and frequency bands were calculated with their power. The wavelet decomposition was done and a logistic discriminate analysis was carried out to classify patients and normal controls. The normalized peak electromyograms of patients were significantly greater than controls (P<0.01). The muscle conduc...Continue Reading

References

Jun 30, 2000·Journal of Occupational and Environmental Medicine·C AmbrozE O Talbott
Jan 7, 2004·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·M K SohnP Svensson
Feb 11, 2004·The Clinical Journal of Pain·Michael E GeisserElizabeth A Wiggert

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