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The characterization of biological rhythms in mild cognitive impairment

Elisabet Ortiz-Tudela1, Antonio Martinez-Nicolas1, Carmen Díaz-Mardomingo2

  • 1Chronobiology Laboratory, Department of Physiology, Faculty of Biology, University of Murcia, Campus de Espinardo, Espinardo, 30100 Murcia, Spain.

Biomed Research International
|August 27, 2014
PubMed
Abstract

Insights

Mild cognitive impairment (MCI) patients show an advanced biological clock, indicating accelerated aging of their circadian system compared to healthy individuals. This early circadian clock shift may be a precursor to dementia.

Area of Science:

  • Chronobiology
  • Neuroscience
  • Gerontology

Background:

  • Dementia and Alzheimer's disease are linked to circadian impairments and biological clock disruption.
  • These disruptions are intrinsic to the disease, not solely age-related.
  • Investigating early-stage cognitive decline is crucial for understanding disease progression.

Purpose of the Study:

  • To determine if circadian system alterations are present in patients with mild cognitive impairment (MCI).
  • To compare circadian markers in MCI patients versus age-matched healthy subjects.

Main Methods:

  • Ambulatory monitoring of 40 subjects (21 MCI, 19 healthy) for one week.
  • Recorded wrist skin temperature, motor activity, and body position.
  • Utilized the integrated TAP variable (temperature, activity, position) and applied nonparametrical analyses.

Main Results:

  • MCI patients exhibited a significant phase advance in circadian rhythm markers.
  • Specific phase advances observed in temperature M5, L10, and TAP L5, M10 compared to controls.
  • Demonstrated a statistically significant difference in biological clock timing between groups.

Conclusions:

  • Circadian system alterations, specifically biological clock advances, are present in MCI patients.
  • Suggests an accelerated aging of the circadian clock in individuals with MCI.
  • These findings highlight potential early biomarkers for neurodegenerative disease.

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