![]() ![]() ![]() A cross-sectional study design was used to measure the amplitude of muscle activation (as a percentage of maximum voluntary contraction) in each patient across the 2 muscles (MF and longissimus thoracis) during quadruped stabilization exercise with neutral posture and with increased lumbar lordosis. Each patient performed 4 exercises in random order, with surface electromyography electrodes and an electrogoniometer attached. A total of 23 patients with CLBP (12 females and 11 males) were recruited based on inclusion and exclusion criterion. The objective was to investigate the electromyographic activity of the lumbar multifidus (MF) muscle and longissimus thoracis muscle, along with their activity ratio (MF longissimus thoracis ratio), during quadruped stabilization exercise performed with neutral posture and with increased lumbar lordosis in patients with chronic low back pain (CLBP). ![]()
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