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Entropy principle for human development, growth and aging.

I Aoki1

  • 1Department of Physics, Osaka Medical School, Japan.

Journal of Theoretical Biology
|May 21, 1991
PubMed
Summary
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Human entropy production, a measure of metabolic heat, remains constant in men across temperatures. Women exhibit a minimum at 30°C, with lower overall entropy production than men.

Area of Science:

  • Human physiology
  • Thermodynamics
  • Metabolic studies

Background:

  • Entropy production is a thermodynamic concept applicable to biological systems.
  • Previous research by Du Bois et al. (1952) provides foundational energetic data.

Purpose of the Study:

  • To calculate and analyze entropy production in nude human subjects.
  • To investigate the influence of environmental temperature, sex, and age on entropy production.

Main Methods:

  • Utilized energetic data from Du Bois et al. (1952).
  • Calculated entropy production for men and women across a range of environmental temperatures.
  • Analyzed age-related changes in entropy production from infancy to old age.

Main Results:

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  • Men's entropy production is constant between 24-34°C, with metabolic processes accounting for 98.6%.
  • Women's entropy production shows a minimum at 30°C and is 8.7% lower than men's on average.
  • Entropy production increases in early childhood, decreases rapidly until age 25, and then declines gradually throughout adulthood.

Conclusions:

  • A three-stage hypothesis for human entropy production across the lifespan is proposed.
  • Environmental temperature significantly impacts women's entropy production, unlike men's.
  • Entropy production dynamics vary distinctly between sexes and across different life stages.