Aim
CNLBP, disability, pain
This study aimed to analyze the effect of a program based on re-education exercises on the preactivation of the TrA muscle in terms of pain intensity, disability, activation measured with a pressure biofeedback unit (PBU), thickness measured with ultrasound (US), resistance measured with electromyography (EMG) compared with conventional treatment in adult people with CNLBP in primary care. We also investigated the relationship between the activation of the TrA muscle and pain and disability.