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Circadian rhythms in human body composition

P Cugini1, A Salandri, C M Petrangeli

  • 1Chronobiology Unit, University of Rome, La Sapienza, Italy.

Chronobiology International
|November 1, 1996
PubMed
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Human body composition exhibits daily changes, with key variables peaking at night. This circadian rhythm suggests rest plays a vital role in anabolic processes influencing body composition.

Area of Science:

  • Physiology
  • Chronobiology
  • Body Composition Analysis

Background:

  • Human body composition (BC) is influenced by various factors, including daily rhythms.
  • Understanding these temporal variations is crucial for accurate physiological assessment.
  • Circadian rhythms (CR) are known to affect numerous biological processes.

Purpose of the Study:

  • To investigate the influence of the day-night cycle on human body composition.
  • To analyze the temporal characteristics and circadian rhythm of BC variables.
  • To explore the role of rest in the nocturnal phase of BC circadian rhythms.

Main Methods:

  • Bioelectrical impedance analysis (BIA) was used to measure BC in 10 clinically healthy subjects (CHS).
  • Measurements were taken at 2-hour intervals in a supine position, controlling for meals and bodily functions.

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  • Time series data were analyzed for temporal patterns and circadian rhythmicity.

    • Main Results:

    • All measured BC variables demonstrated significant within-day variability.
    • Notable nighttime crests were observed across all BC parameters.
    • A synchronized oscillation in BC variables was identified, linked to the day-night cycle.

    Conclusions:

    • Human body composition exhibits a distinct circadian rhythm with a nocturnal phase.
    • Rest periods, through their anabolic effects, are fundamental to the nocturnal CR of BC.
    • These findings highlight the importance of the diurnal cycle in regulating human body composition.