Intra-individual cortisol variability and low-grade inflammation over 10 years in older adults

Heather Herriot, Carsten Wrosch*, Jean Philippe Gouin, Gregory E. Miller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Objective This study examined the associations between intra-individual variability in, and inter-individual levels of, diurnal cortisol secretion with a marker of low-grade inflammation (i.e., C-Reactive Protein; CRP). Reasoning that greater day-to-day cortisol variability could reflect a dysregulation of the HPA axis, we hypothesized that it would predict higher levels of CRP, above and beyond inter-individual differences in cortisol levels. Methods A 10-year longitudinal study of 130 older adults examined diurnal cortisol secretion on three different days across each of the 6 waves of data collection and levels of CRP during the last 3 waves. Indicators of mean cortisol levels, short-term cortisol variability, and long-term cortisol variability were analyzed. Results Hierarchical linear modeling showed significant main effects, linking baseline mean cortisol levels, T-ratio = 2.25, p = 0.03, and long-term cortisol variability, T-ratio = 2.63, p = 0.01, with higher CRP values six to ten years after study entry. In addition, a two-way interaction demonstrated that short-term variability in cortisol were associated with higher levels of CRP among individuals who secreted relatively high, T-ratio = 2.68, p = 0.01, but not low, T-ratio = −1.09, p = 0.28, baseline levels of cortisol. Finally, a three-way interaction, T-ratio = 2.24, p = 0.03, suggested that the effect of long-term cortisol variability on CRP became stronger over time among participants who secreted high average levels of cortisol, whereas it became weaker among their counterparts who secreted low average levels of cortisol. Conclusion Variability in cortisol secretion across days forecasts low-grade inflammation, and this association is paramount among older adults who secrete high levels of diurnal cortisol.

Original languageEnglish (US)
Pages (from-to)141-149
Number of pages9
JournalPsychoneuroendocrinology
Volume77
DOIs
StatePublished - Mar 1 2017

Keywords

  • Chronic inflammation
  • Cortisol level
  • Cortisol variability
  • Older adulthood

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Endocrine and Autonomic Systems
  • Psychiatry and Mental health
  • Biological Psychiatry

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