We investigated tools for evaluating back muscle fatigability in participants with chronic low back pain (LBP) after spinal stabilization exercises (SSE). We compared electromyography (EMG) signals of the thoracic and lumbar erector spinae muscles between the entropy of the EMG signals and the power spectrum analysis. The results indicated that the participants' pain levels decreased significantly after 4 weeks of SSE. The entropy of the EMG signals also decreased and demonstrated significant interaction with pain level. The slope of the median frequency based on power spectrum analysis also decreased but did not demonstrate any interaction with pain level. Therefore, the entropy of the EMG signals might be a useful tool for measuring LBP and should be further investigated with regard to pain level following intervention.
Volume 47 Number 2, 2010
Pages 133 — 142