No differences in muscle activity were established in either the concentric, holding, and eccentric phase for the LD and GM muscles. Higher EMG activity was observed in continuous CLBP compared to RLBP in the ES and MF muscles in the holding phase ( p = 0.035 p = 0.037), and in the MF in the concentric phase ( p = 0.046), but not in the ES ( p = 0.062). ResultsĬontinuous CLBP patients showed higher EMG activity in the ES and MF muscles compared to healthy controls in the concentric ( p = 0.011 p = 0.009 respectively) and the holding phase ( p = 0.015 p = 0.013). In 75 subjects (16 continuous CLBP, 15 non-continuous CLBP, 23 RLBP, 21 healthy controls), surface electromyographic (EMG) activity of the lumbar erector spinae (ES), multifidus (MF), latissimus dorsi (LD) and gluteus maximus (GM) was recorded during the concentric, holding and eccentric phase of a modified Biering Sorenson exercise. This study compared lumbar muscle activity during trunk extension in patients with continuous chronic LBP (CLBP), non-continuous CLBP, recurrent LBP (RLBP) and healthy subjects. Altered lower back muscle activity is proposed as a contributing factor to the reoccurrence and chronicity of low back pain (LBP).
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