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Effect of Vitamin D Supplementation on Muscle Strength, Gait and Balance in Older Adults: A Systematic Review and Meta‐Analysis
Author(s) -
Muir Susan W.,
MonteroOdasso Manuel
Publication year - 2011
Publication title -
journal of the american geriatrics society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.992
H-Index - 232
eISSN - 1532-5415
pISSN - 0002-8614
DOI - 10.1111/j.1532-5415.2011.03733.x
Subject(s) - medicine , cochrane library , meta analysis , balance (ability) , confidence interval , randomized controlled trial , physical therapy , regimen , gait , dosing , strictly standardized mean difference
Objectives To systematically review and quantitatively synthesize the effect of vitamin D supplementation on muscle strength, gait, and balance in older adults. Design Systematic review and meta‐analysis. Setting MEDLINE, EMBASE, Cochrane Library, bibliographies of selected articles, and previous systematic reviews were searched between January 1980 and November 2010 for eligible articles. Participants Older adults (≥60) participating in randomized controlled trials of the effect of supplemental vitamin D without an exercise intervention on muscle strength, gait, and balance. Measurements Data were independently extracted, and study quality was evaluated. Meta‐analysis using a fixed‐effects model was performed and the I 2 statistic was used to assess heterogeneity. Results Of 714 potentially relevant articles, 13 met the inclusion criteria. In the pooled analysis, vitamin D supplementation yielded a standardized mean difference of −0.20 (95% confidence interval (CI) = −0.39 to −0.01, P = .04, I 2 = 0%) for reduced postural sway, −0.19 (95% CI = −0.35 to −0.02, P = .03, I 2 = 0%) for decreased time to complete the Timed Up and Go Test, and 0.05 (95% CI = −0.11 to 0.20, P = .04, I 2 = 0%) for lower extremity strength gain. Regarding dosing frequency regimen, only one study demonstrated a beneficial effect on balance with a single large dose. All studies with daily doses of 800 IU or more demonstrated beneficial effects on balance and muscle strength. Conclusion Supplemental vitamin D with daily doses of 800 to 1,000 IU consistently demonstrated beneficial effects on strength and balance. An effect on gait was not demonstrated, although further evaluation is recommended.