Background Characterizing the lumbar muscle flexion-relaxation phenomenon is a clinically
relevant approach in understanding the neuromuscular alternations of low back pain
patients. Previous studies have indicated that changes in stance posture could directly
influence trunk kinematics and potentially change the lumbar tissue synergy. In this study,
the effects of stance width and foot posture on the lumbar muscle relaxation responses
during trunk flexion were investigated. Methods Thirteen volunteers performed trunk flexion …