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Circadian hematologic time structure in the elderly.

J Swoyer1, P Irvine, L Sackett-Lundeen

  • 1Department of Pathology, St. Paul-Ramsey Medical Center/Ramsey Clinic, MN 55101.

Chronobiology International
|January 1, 1989
PubMed
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Circadian rhythms in blood cells persist in the elderly, though timing shifts and reduced amplitudes are observed. This research highlights age-related changes in hematologic rhythms for healthy older adults.

Area of Science:

  • Gerontology
  • Hematology
  • Chronobiology

Background:

  • Circadian rhythms, or daily biological cycles, influence numerous physiological processes.
  • Understanding age-related changes in these rhythms is crucial for geriatric health.
  • Hematologic parameters are known to exhibit circadian variations.

Purpose of the Study:

  • To investigate the persistence and characteristics of circadian rhythms in hematologic variables in elderly individuals.
  • To compare these rhythms in the elderly with those of younger adult populations.
  • To identify specific age-related alterations in the timing, amplitude, and mean values of blood cell counts.

Main Methods:

  • Study involved 23 healthy elderly subjects (71 ± 5 years) over a 24-hour period.

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  • Complete blood counts and differential counts were performed using automated analysis and stained smears.
  • Circadian rhythm parameters were analyzed using cosinor and Bingham statistical tests and compared to reference data.

    • Main Results:

    • Circadian rhythms in circulating blood cells are maintained in elderly individuals.
    • Elderly subjects exhibited phase advances in circadian rhythms for neutrophil leukocytes and lymphocytes compared to young adults.
    • A decreased circadian amplitude in platelets and reduced mean (mesor) values for red blood cells and neutrophil band forms were noted in the elderly.

    Conclusions:

    • Circadian rhythmicity of peripheral blood cells persists into old age.
    • Significant differences in the timing and amplitude of these rhythms exist between elderly and younger adults.
    • These findings provide insights into age-related hematologic changes and their potential clinical implications.