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Power spectral analysis of lumbar muscle electromyogram in chronic low-back pain patients during dynamic trunk exercise

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6 Author(s)
Cheolgyu Lee ; Fac. of Sci. & Technol., Keio Univ., Yokohama, Japan ; Minamitani, H. ; Kihwan Ju ; Wakano, K.
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The purpose of this study was to investigate the pattern of lumbar muscle fatigue at spinal level during repeated dynamic trunk flexion and extension exercise in chronic low-back pain (CLBP) patients and in control subjects without back pain. The authors used a lumbar extension machine which is designed to isolate lumbar extension functions. The electromyogram (EMG) signal from erector spinae muscles at lumbar 1 (L1), L3 and L5 spinal level was detected by surface electrodes. Subjects were required to perform one set of variable resistance lumbar extensions through a 72° range of motion (ROM) with a weight load that allowed 13 repetitions of fatigue contraction. Median frequency (MF) of the EMG power spectrum was analyzed to compare fatigue. The experimental results indicated: (1) each lumbar muscle has a characteristic initial MF (IMF); (2) the IMF of each lumbar level showed no significant difference between the CLBP and control groups; (3) there were significant differences in the decreasing ratio of MF between L1, L3 and L5 in both groups; (4) the decreasing ratio of MF at L5 in the CLBP group was significantly higher than the control group

Published in:

Engineering in Medicine and Biology Society, 1995., IEEE 17th Annual Conference  (Volume:2 )

Date of Conference:

20-23 Sep 1995