Nonlinear blood pressure effects on cognition in old age: Separating between-person and within-person associations

Valgeir Thorvaldsson, Ingmar Skoog, Scott M. Hofer, Anne Börjesson-Hanson, Svante Östling, Simona Sacuiu, Boo Johansson

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Midlife hypertension is associated with increased risk of cognitive impairment in later life. The association between blood pressure (BP) in older ages and cognition is less clear. In this study we provide estimates of between-person and within-person associations of BP and cognition in a population-based sample (N = 382) followed from age 70 across 12 occasions over 30 years. Between-person associations refer to how individual differences in BP relates to individual differences in cognition. Within-person associations refer to how individual and time specific changes in BP relate to variation in cognition. Hierarchical linear models were fitted to data from three cognitive measurements (verbal ability, spatial ability, and perceptual speed) while accounting for demographic and health-related covariates. We found consistent nonlinear between-person associations between diastolic BP (DBP) and cognition, such that both low (>75 mmHg) and high (<95 mmHg) pressure were associated with poorer cognition. Within-person decreases in systolic BP (SBP) and DBP were associated with decreases in perceptual speed. Notably, between-person and within-person estimates did not reveal similar associations, suggesting the need to separate the two effects in the analysis of associations between BP and cognition in old age.

Original languageEnglish (US)
Pages (from-to)375-383
Number of pages9
JournalPsychology and Aging
Volume27
Issue number2
DOIs
StatePublished - Dec 1 2012

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Keywords

  • Between-person and within-person associations
  • Blood pressure
  • Cognitive function
  • Longitudinal study

ASJC Scopus subject areas

  • Social Psychology
  • Aging
  • Geriatrics and Gerontology

Cite this

Thorvaldsson, V., Skoog, I., Hofer, S. M., Börjesson-Hanson, A., Östling, S., Sacuiu, S., & Johansson, B. (2012). Nonlinear blood pressure effects on cognition in old age: Separating between-person and within-person associations. Psychology and Aging, 27(2), 375-383. https://doi.org/10.1037/a0025631