Journal
JOURNAL OF THE AMERICAN GERIATRICS SOCIETY
Volume 58, Issue 11, Pages 2076-2084Publisher
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1532-5415.2010.03154.x
Keywords
handgrip strength; hip strength; knee strength; mortality; older women
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Funding
- National Institute on Aging (NIA), National Institutes of Health (NIH) [P30-AG02133, R01-AG11703, R01-AG023701]
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OBJECTIVES: To assess the relationship between rate of change in muscle strength and all-cause mortality. DESIGN: Prospective observational study of the causes and course of physical disability. SETTING: Twelve contiguous ZIP code areas in Baltimore, Maryland. PARTICIPANTS: Three hundred seven community-dwelling women aged 70 to 79 at study baseline. MEASUREMENTS: The outcome was all-cause mortality (1994-2009); predictors included up to seven repeated measurements of handgrip, knee extension, and hip flexion strength, with a median follow-up time of 10 years. Demographic factors, body mass index, smoking status, number of chronic diseases, depressive symptoms, physical activity, interleukin-6, and albumin were assessed at baseline and included as confounders. The associations between declining muscle strength and mortality were assessed using a joint longitudinal and survival model. RESULTS: Grip and hip strength declined an average of 1.10 and 1.31 kg/year between age 70 and 75 and 0.50 and 0.39 kg/year thereafter, respectively; knee strength declined at a constant rate of 0.57 kg/year. Faster rates of decline in grip and hip strength, but not knee strength, independently predicted mortality after accounting for baseline levels and potential confounders (hazard ratio (HR) = 51.33, 95% confidence interval (95%) CI = 1.06-1.67, HR = 1.14, 95% CI = 0.91-1.41, and 2.62, 95% CI = 1.43-4.78 for every 0.5 standard deviation increase in rate of decline in grip, knee, and hip strength, respectively). CONCLUSION: Monitoring the rate of decline in grip and hip flexion strength in addition to absolute levels may greatly improve the identification of women most at risk of dying. J Am Geriatr Soc 58:2076-2084, 2010.
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