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Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
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Does subjective sleep affect cognitive function in healthy elderly subjects? The Proof cohort.

Magali Saint Martin1, Emilia Sforza, Jean Claude Barthélémy

  • 1Department of Clinical Physiology and Exercise, Pole NOL, CHU and Faculty of Medicine of Saint-Etienne, UJM and PRES University of Lyon, France. magali.stmartin@orange.fr

Sleep Medicine
|August 10, 2012
PubMed
Summary

In healthy older adults, poor sleep quality did not significantly impact cognitive function. However, sleep medication use may affect attention, highlighting its importance in elderly cognitive health.

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Area of Science:

  • Gerontology
  • Sleep Medicine
  • Cognitive Neuroscience

Background:

  • Epidemiological studies suggest a link between sleep issues and cognitive decline in the elderly.
  • Understanding this relationship is crucial for maintaining cognitive health in aging populations.

Purpose of the Study:

  • To investigate the association between sleep quality, subjective cognitive complaints, and objective neuropsychological performance in healthy elderly individuals.
  • To assess how sleep quality (using the Pittsburgh Sleep Quality Index - PSQI) relates to cognitive function in this demographic.

Main Methods:

  • A cross-sectional study of 272 healthy elderly subjects (mean age 74.8 years).
  • Utilized self-assessment questionnaires (cognitive function, anxiety, depression, sleep parameters, PSQI) and objective measures (polygraphy, neuropsychological tests).
  • Participants were categorized into good sleepers (GS, PSQI<5) and poor sleepers (PS, PSQI≥5).

Main Results:

  • Poor sleep quality did not correlate with subjective cognitive function scores; anxiety, depression, and sleep medication were stronger predictors.
  • No significant differences in objective cognitive tests between GS and PS, except for slower processing speed (Trail Making Test A) in the PS group.
  • Sleep-related breathing disorders and gender did not influence cognitive performance.

Conclusions:

  • Subjective sleep quality and duration did not significantly impact overall cognitive performance in healthy older adults.
  • Attention, specifically processing speed, may be affected by poor sleep, with sleep medication interference being a key consideration.
  • Further research should explore the nuanced effects of sleep quality and medication on specific cognitive domains in the elderly.