Larsen LH, et al. - Researchers here aimed to assess the impact of experimental low back pain (LBP) in pain-free recurrent LBP patients and controls. During experimental muscle LBP, task duration and trunk muscle activity increased in controls and decreased in recurrent LBP patients. Thereby suggesting protective strategies in controls during acute pain while recurrent LBP patients showed higher pain intensity and altered strategies that might be caused by the higher pain intensity.