Clinical biomechanics
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Clinical biomechanics · Oct 1996
EMG activities of the quadratus lumborum and erector spinae muscles during flexion-relaxation and other motor tasks.
The aim of this study was to provide new information on the myoelectrical activation of the quadratus lumborum, the deep lateral and the superficial medial lumbar erector spinae, the psoas, and the iliacus muscles in various motor tasks. DESIGN: An intramuscular electromyographic study was performed. ⋯ In general, the activation of the investigated muscles showed a high degree of task specificity, where activation of a certain muscle was not always predictable from its anatomical arrangement and mechanical advantage.