Letter to the editor: 'Recovery from chronic fatigue syndrome after treatments given in the PACE trial': recovery or remission?

Operant Learning Versus Energy Conservation Activity Pacing Treatments in a Sample of Patients With Fibromyalgia Syndrome: A Pilot Randomized Controlled Trial

This study's aim was to assess the efficacy of 2 forms of activity pacing in patients with fibromyalgia syndrome (FMS). Treatment-related changes in activity management patterns were also examined. Patients with FMS (n = 178) were randomly assigned to an operant learning (OL; delayed [n = 36] or immediate [n = 54] groups) or an energy conservation (EC; delayed [n = 35] or immediate [n = 53] groups) treatment condition. Of these, 32 OL and 37 EC patients completed treatment. Forty-three patients were allocated to the delayed treatment condition (control group). Repeated measures analyses of variance were used to examine the effects of OL and EC treatments on primary (average pain and usual fatigue), secondary (pain and fatigue interference, physical and psychological function, sleep quality, depressive symptoms, and anxiety symptoms), and tertiary (pain-related activity patterns) outcomes. Neither treatment was effective in reducing average pain or usual fatigue symptoms. Relative to EC, OL patients showed greater improvements in depressive symptoms, whereas nonsignificant trends (P values ranging between .05 and .06) were observed for pain interference, fatigue interference, and psychological function. Both treatments were associated with improvements in sleep quality and physical function, increases in pacing, and decreases in overdoing activity patterns. Reductions in activity avoidance were only found in OL. These findings suggest that OL may be more beneficial than EC and that it could potentially be viewed as an effective stand-alone activity pacing treatment for patients with FMS. Research to determine the extent to which these preliminary findings replicate is warranted. PERSPECTIVE: This article examines the efficacy of 2 forms of activity pacing in patients with fibromyalgia syndrome. The results suggest the possibility that operant learning may be more beneficial than energy conservation and could potentially be viewed as an effective stand-alone activity pacing treatment for patients with fibromyalgia syndrome.