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J Am Geriatr Soc. 2011 Oct;59(10):1793-801. doi: 10.1111/j.1532-5415.2011.03601.x. Epub 2011 Sep 21.

Serum 25-hydroxyvitamin D and physical function in older adults: the Cardiovascular Health Study All Stars.

Author information

1
Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Sticht Center on Aging, Wake Forest School of Medicine, Winston Salem, NC 27157, USA. dhouston@wakehealth.edu

Abstract

OBJECTIVES:

To examine the association between 25-hydroxyvitamin D (25(OH)D) and physical function in adults of advanced age.

DESIGN:

Cross-sectional and longitudinal analysis of physical function over 3 years of follow-up in the Cardiovascular Health Study All Stars.

SETTING:

Forsyth County, North Carolina; Sacramento County, California; Washington County, Maryland; and Allegheny County, Pennsylvania.

PARTICIPANTS:

Community-dwelling adults aged 77 to 100 (N = 988).

MEASUREMENTS:

Serum 25-hydroxyvitamin D 25(OH)D), Short Physical Performance Battery (SPPB), and grip and knee extensor strength assessed at baseline. Mobility disability (difficulty walking half a mile or up 10 steps) and activities of daily living (ADLs) disability were assessed at baseline and every 6 months over 3 years of follow-up.

RESULTS:

Almost one-third (30.8%) of participants were deficient in 25(OH)D (<20 ng/mL). SPPB scores were lower in those with deficient 25(OH)D (mean (standard error) 6.53 (0.24)) than in those with sufficient 25(OH)D (≥30 ng/mL) (7.15 (0.25)) after adjusting for sociodemographic characteristics, season, health behaviors, and chronic conditions (P = .006). Grip strength adjusted for body size was also lower in those with deficient 25(OH)D than in those with sufficient 25(OH)D (24.7 (0.6) kg vs 26.0 (0.6) kg, P = .02). Participants with deficient 25(OH)D were more likely to have prevalent mobility (OR = 1.44, 95% confidence interval (CI)) = 0.96-2.14) and ADL disability (OR = 1.51, 95% CI = 1.01-2.25) at baseline than those with sufficient 25(OH)D. Furthermore, participants with deficient 25(OH)D were at greater risk of incident mobility disability over 3 years of follow-up (hazard ratio = 1.56, 95% CI = 1.06-2.30).

CONCLUSION:

Vitamin D deficiency was common and was associated with poorer physical performance, lower muscle strength, and prevalent mobility and ADL disability in community-dwelling older adults. Moreover, vitamin D deficiency predicted incident mobility disability.

PMID:
22091492
PMCID:
PMC3228270
DOI:
10.1111/j.1532-5415.2011.03601.x
[Indexed for MEDLINE]
Free PMC Article

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