Subclinical hypothyroidism and functional mobility in older adults

Eleanor M. Simonsick, Anne B. Newman, Luigi Ferrucci, Suzanne Satterfield, Tamara B. Harris, Nicolas Rodondi, Douglas C. Bauer

Research output: Contribution to journalArticle

Abstract

Background: Health risks associated with subclinical hypothyroidism in older adults are unclear. Our objective was to compare the functional mobility of people aged 70 to 79 years by thyroid function categorized by thyrotropin (TSH) level as euthyroid (≥0.4 to <4.5 mIU/L), mild subclinical hypothyroid (≥4.5 to <7.0 mIU/L), or moderate subclinical hypothyroid (≥7.0 to ≤20.0 mIU/L with a normal free thyroxine level) cross-sectionally and over 2 years. Methods: A total of 2290 community-dwelling residents participating in the year 2 clinic visit (July 1998-June 1999) of the Health, Aging, and Body Composition (Health ABC) Study, who had measured TSH level, had the capacity to walk 20 m unaided, and were not taking thyroid medication or had TSH levels consistent with hyperthyroidism or hypothyroidism. Main outcome measures included self-reported and performance-based measures of mobility (usual and rapid gait speed and endurance walking ability) assessed at study baseline (year 2) and 2 years later. Results: In age- and sex-adjusted analyses, the mild subclinical hypothyroid group (vs the euthyroid group) demonstrated better mobility (faster mean usual and rapid gait speed [1.20 vs 1.15 m/s and 1.65 vs 1.56 m/s, respectively; P<.001] and had a higher percentage of those with good cardiorespiratory fitness and reported walking ease [39.2% vs 28.0% and 44.7% vs 36.5%, respectively; P<.001]). After 2 years, persons with mild subclinical hypothyroidism experienced a similar decline as the euthyroid group but maintained their mobility advantage. Persons with moderate subclinical hypothyroidism had similar mobility and mobility decline as the euthyroid group. Conclusion: Generally, well-functioning 70- to 79-yearold individuals with subclinical hypothyroidism do not demonstrate increased risk of mobility problems, and those with mild elevations in TSH level show a slight functional advantage.

Original languageEnglish (US)
Pages (from-to)2011-2017
Number of pages7
JournalArchives of internal medicine
Volume169
Issue number21
DOIs
StatePublished - Nov 23 2009

ASJC Scopus subject areas

  • Internal Medicine

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    Simonsick, E. M., Newman, A. B., Ferrucci, L., Satterfield, S., Harris, T. B., Rodondi, N., & Bauer, D. C. (2009). Subclinical hypothyroidism and functional mobility in older adults. Archives of internal medicine, 169(21), 2011-2017. https://doi.org/10.1001/archinternmed.2009.392