Abstract
Objective
To examine how self-reported pain- and fatigue-related activity interference relates
to symptoms and physical activity (PA) in daily life among people with knee or hip
osteoarthritis.
Design
Cross-sectional study with a 7-day repeated-measures assessment period.
Setting
General community.
Participants
Participants (N=154; mean age, 65y; 60% women [n=92]) with knee or hip osteoarthritis
and pain lasting ≥3 months.
Interventions
Not applicable.
Main Outcome Measures
Pain- or fatigue-related activity interference items on the Brief Pain Inventory or
Brief Fatigue Inventory, respectively, from baseline survey, momentary pain and fatigue
severity (measured 5times/d for 7d), and PA measured with a wrist-worn accelerometer
over 7 days. We hypothesized that perception of pain- and fatigue-related activity
interference would moderate the association between symptoms (pain or fatigue) and
PA. People with higher pain- or fatigue-related activity interference were thought
to have stronger negative associations between momentary ratings of pain and fatigue
and PA than did those with lower activity interference.
Results
Pain-related activity interference moderated the association between momentary pain
and PA, but only in the first part of the day. Contrary to expectation, during early
to midday (from wake-up time through 3 pm), low pain-related interference was associated with stronger positive associations
between pain and PA but high pain-related interference was associated with a small
negative association between pain and PA. Fatigue-related activity interference did
not moderate the relation between fatigue and activity over the course of a day.
Conclusions
Depending on a person's reported level of pain-related activity interference, associations
between pain and PA were different earlier in the day. Only those with high pain-related
activity interference had lower levels of PA as pain increased and only in the morning.
High pain-related activity interference may be important to address, particularly
to maintain PA early in the day despite pain.
Keywords
List of abbreviations:
BFI (Brief Fatigue Inventory), BMI (body mass index), BPI (Brief Pain Inventory), MLM (multilevel modeling), OA (osteoarthritis), PA (physical activity)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: May 17, 2016
Footnotes
Supported by the Rehabilitation and Research Branch of the Veterans Affairs Office of Research & Development (grant no. 1I01RX000410), by the National Institutes of Health – National Center for Medical and Rehabilitation Research and National Institute for Neurological Disorders and Stroke (grant no. K12 HD055929), and by the National Institute of Arthritis and Musculoskeletal and Skin Diseases (grant no. 1K01AR064275).
Clinical Trial Registration No.: NCT01192516.
Publication of this article was supported by the American Congress of Rehabilitation Medicine.
Disclosures: none.
Identification
Copyright
© 2016 by the American Congress of Rehabilitation Medicine
