Article

Pain, Functional Limitations, and Aging

Department of Medicine, University of California at San Francisco, 4150 Clement, San Francisco, CA 94121, USA.
Journal of the American Geriatrics Society (Impact Factor: 4.22). 09/2009; 57(9):1556-61. DOI: 10.1111/j.1532-5415.2009.02388.x
Source: PubMed

ABSTRACT To examine the relationship between functional limitations and pain across a spectrum of age, ranging from mid life to advanced old age.
Cross-sectional study.
The 2004 Health and Retirement Study (HRS), a nationally representative study of community-living persons aged 50 and older.
Eighteen thousand five hundred thirty-one participants in the 2004 HRS.
Participants who reported that they were often troubled by pain that was moderate or severe most of the time were defined as having significant pain. For each of four functional domains, subjects were classified according to their degree of functional limitation: mobility (able to jog 1 mile, able to walk several blocks, able to walk one block, unable to walk one block), stair climbing (able to climb several flights, able to climb one flight, not able to climb a flight), upper extremity tasks (able to do 3, 2, 1, or 0), and activity of daily living (ADL) function (able to do without difficulty, had difficulty but able to do without help, need help).
Twenty-four percent of participants had significant pain. Across all four domains, participants with pain had much higher rates of functional limitations than subjects without pain. Participants with pain were similar in terms of their degree of functional limitation to participants 2 to 3 decades older. For example, for mobility, of subjects aged 50 to 59 without pain, 37% were able to jog 1 mile, 91% were able to walk several blocks, and 96% were able to walk one block without difficulty. In contrast, of subjects aged 50 to 59 with pain, 9% were able to jog 1 mile, 50% were able to walk several blocks, and 69% were able to walk one block without difficulty. Subjects aged 50 to 59 with pain were similar in terms of mobility limitations to subjects aged 80 to 89 without pain, of whom 4% were able to jog 1 mile, 55% were able to walk several blocks, and 72% were able to walk one block without difficulty. After adjustment for demographic characteristics, socioeconomic status, comorbid conditions, depression, obesity, and health habits, across all four measures, participants with significant pain were at much higher risk for having functional limitations (adjusted odds ratio (AOR)=2.85, 95% confidence interval (CI)=2.20-3.69, for mobility; AOR=2.84, 95% CI=2.48-3.26, for stair climbing; AOR=3.96, 95% CI=3.43-4.58, for upper extremity tasks; and AOR=4.33; 95% CI=3.71-5.06, for ADL function).
Subjects with pain develop the functional limitations classically associated with aging at much earlier ages.

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    • "More than 50% of older adults suffer from persistent (musculoskeletal) pain that is often disabling (Thomas et al., 2004; Pickering, 2005; Covinsky et al., 2009). Despite the urgency to better account for and manage older people's pain experiences, research on its psychosocial determinants is still on its infancy (Gibson and Weiner, 2005). "
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    • "Weaver et al. (2009) already found a positive association between frailty and pain. Due to close associations between pain and physical components of functional limitation (Covinsky et al., 2009), and between this functional limitation and frailty, further research is needed to determine whether the pain–frailty relationship is mediated by physical function. The fact that frail individuals reported good health less frequently has already been shown by others (Fried et al., 2001; Kiely et al., 2009). "
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