• Silke Rost, Dimitri M L Van Ryckeghem, Peter Koval, Stefan Sütterlin, Claus Vögele, and Geert Crombez.
• aInstitute for Health and Behaviour, INSIDE, University of Luxembourg, Esch-sur-Alzette, Luxembourg bDepartment of Experimental Clinical and Health Psychology, Ghent University, Ghent, Belgium cSchool of Psychology, Australian Catholic University, New South Wales, Australia dResearch Group of Quantitative Psychology and Individual Differences, University of Leuven, Leuven, Belgium eSection of Psychology, Lillehammer University College, Lillehammer, Norway fResearch Group Health Psychology, University of Leuven, Leuven, Belgium gResearch Group on Health Psychology, Department of Psychosomatic Medicine, Division of Surgery and Clinical Neuroscience, Oslo University Hospital, Rikshospitalet, Oslo, Norway.
• Pain. 2016 Aug 1; 157 (8): 1783-90.

AbstractAffective instability, conceptualized as fluctuations in mood over time, has been related to ill-health and psychopathology. In this study, we examined the role of affective instability on daily pain outcomes in 70 patients with chronic pain (Mage = 49.7 years; 46 females) using an end-of-day diary. During a baseline phase, patients completed self-reported questionnaires of pain severity, pain duration, disability, depression, and anxiety. During a subsequent diary phase, patients filled out an electronic end-of-day diary over 14 consecutive days assessing daily levels of pain severity, disability, cognitive complaints, negative affect (NA) and positive affect. Affective instability was operationalized as the mean square of successive differences in daily mood (separately for NA and positive affect), which takes into account the size of affective changes over consecutive days. Results indicated that NA instability was positively associated with daily disability, beyond the effects of daily pain severity. Furthermore, NA instability moderated the relationship between daily pain severity and daily disability and the relationship between daily pain severity and daily cognitive complaints. Positive affect instability, however, showed to be unrelated to all outcomes. Current findings extend previous results and reveal the putative role of affective instability on pain-related outcomes and may yield important clinical implications. Indeed, they suggest that targeting NA instability by improving emotion regulation skills may be a strategy to diminish disability and cognitive complaints in patients with chronic pain.

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