Metabolic syndrome and cognitive decline in early Alzheimer's disease and healthy older adults

Amber S. Watts, Natalia Loskutova, Jeffrey M. Burns, David K Johnson

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Metabolic syndrome (MetS) is a cluster of risk factors (i.e., abdominal obesity, hypertension, dyslipidemia, glucose and insulin dysregulation) that is associated with cardiovascular disease, diabetes, and dementia. Recent studies addressing the association of MetS with cognitive performance and risk for dementia report mixed results. An important step in clarifying these conflicting results is determining whether cognition is influenced by the effects of individual MetS components versus the additive effects of multiple components. We assessed the effect of MetS on cognitive performance and decline over two years in 75 cases of early Alzheimer's disease (AD) and 73 healthy older adult controls in the Brain Aging Project. Using factor analytic techniques, we compared the effect of a combined MetS factor to the effect of individual MetS components on change in attention, verbal memory, and mental status. In healthy controls, a combined MetS factor did not significantly predict cognitive performance, though higher insulin predicted poorer cognitive performance outcomes. In the AD group, higher scores on a combined MetS factor predicted better cognitive outcomes. Our findings suggest that MetS does not have the same association with cognitive decline in healthy older adults and those with early AD. We suggest that individual MetS components should not be evaluated in isolation and that careful methodological approaches are needed to understand the timing and non-linear relationships among these components over time.

Original languageEnglish (US)
Pages (from-to)253-265
Number of pages13
JournalJournal of Alzheimer's Disease
Volume35
Issue number2
DOIs
StatePublished - May 10 2013
Externally publishedYes

Keywords

  • Alzheimer's disease
  • cognitive decline
  • factor analysis
  • metabolic syndrome

ASJC Scopus subject areas

  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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