Trunk control in persons with recurrent low back pain during dynamic balance

Persons in symptom remission from recurrent low back pain (rLBP) and back-healthy persons performed a single-limb dynamic balance task with and without a concurrent mental math task. Thorax and pelvis frontal plane motion was less coupled in the group in remission from rLBP and was associated with the relative activation of deeper and more superficial trunk musculature. Trunk coupling increased significantly under dual-task interference in those with rLBP.