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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
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Related Experiment Video

Updated: Jan 7, 2026

Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Arsenio Paez1,2,3, Sam O Gillman1, Shahla Bakian Dogaheh1

  • 1Concordia University, Montreal, QC, Canada.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 26, 2025
PubMed
Summary

Sleep spindle and slow oscillation activity predict Alzheimer's disease progression. Enhanced sleep patterns correlate with reduced neurodegeneration and improved cognition, offering new therapeutic targets.

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Gerontology

Background:

  • Sleep is crucial for brain health, regulating the clearance of Alzheimer's disease (AD) hallmarks like beta-amyloid (Aβ) and tau proteins.
  • Sleep disturbances can precede cognitive symptoms in AD by decades, but specific sleep characteristics predicting post-onset changes are unclear.

Purpose of the Study:

  • To investigate the association between non-rapid eye-movement sleep spindles, slow oscillations (SO), and neurodegenerative/cognitive changes in mild-to-moderate AD patients.
  • To determine if sleep characteristics predict changes in AD biomarkers and cognitive function over a three-year period.

Main Methods:

  • Prospective cohort study of 60 mild-to-moderate AD patients in Spain.
  • Polysomnography (PSG) for sleep spindle and SO analysis, cerebrospinal fluid (CSF) and blood tests for Aβ and tau biomarkers, and neuropsychological assessments (MMSE, CVLT, ROCF, ADAS-Cog) at baseline and 36-month follow-up.
  • Generalized linear models were used to analyze associations, controlling for age, sex, and apnea-hypopnea index.

Main Results:

  • Higher spindle and SO density, duration, amplitude, and power were significantly associated with changes in Aβ42, phosphorylated tau (pTau-181), total tau, and the tau/Aβ42 ratio.
  • Enhanced sleep activity predicted significantly better cognitive performance, indicated by lower ADAS-Cog and higher MMSE scores, and improved verbal and visual memory.
  • Sleep spindles and SO activity mediated the effect of pTau181/Aβ42 on cognition, and pTau181/Aβ42 moderated the effect of sleep activity on cognition.

Conclusions:

  • Sleep spindle and SO activity serve as predictive, non-invasive biomarkers for neurodegeneration and cognitive status in AD patients.
  • These sleep characteristics represent novel therapeutic targets for potentially delaying cognitive decline and slowing AD progression.