Insomnia and Telomere Length in Older Adults.
Level 4 - case-series / case-control
Cross-sectional case-control observational study.
PubMed 26715231 · doi:10.5665/sleep.5526
What was done
Researchers evaluated 126 older adults (aged 60-88 years; 45 insomnia cases and 81 controls) categorized via DSM-IV criteria for primary insomnia and ICSD-2 criteria for general insomnia. Peripheral blood mononuclear cell (PBMC) telomere length was measured using real-time quantitative PCR (qPCR). An analysis of covariance model adjusted for sex and body mass index (BMI) tested whether insomnia diagnosis and age group (60-69 years vs. 70-88 years) interacted to predict telomere length.
What was found
After adjusting for BMI and sex, the interaction between age group and insomnia diagnosis was statistically significant (P = 0.04). In participants aged 70-88 years, telomere length was significantly shorter in insomnia cases (mean [SD] = 0.59 [0.2]) than in controls (mean [SD] = 0.78 [0.4], P = 0.04). In adults aged 60-69 years, telomere length did not differ significantly between insomnia cases and controls (P = 0.44).
Why it matters
The paper shows an association between clinically defined insomnia and shorter leukocyte telomere length specifically in adults aged 70 and older, highlighting a potential cellular aging mechanism linking late-life sleep disturbance to aging-related morbidities.
Limits
The study is cross-sectional and cannot establish causality. The sample size is small (126 total, 45 insomnia cases) and further divided into subgroups. The abstract does not report adjustment for other potential confounders such as comorbidities, medications, or lifestyle factors.
Cited by
- supports Sleep deprivation has been associated with shorter telomeres.