Health psychology : official journal of the Division of Health Psychology, American Psychological Association
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The present study examined the within-day relationship between fatigue and positive and negative mood among adults with rheumatoid arthritis (RA) or osteoarthritis (OA). ⋯ There was a unidirectional effect of fatigue on subsequent happiness and a bidirectional relationship between fatigue and frustration within the same-day for adults with RA or OA. These findings inform interventions for the management of mood and fatigue throughout the day and suggest that addressing fatigue could improve mood, and that addressing sources of frustration could improve fatigue among people with arthritis.