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Related Experiment Videos

Fat content affects heat capacity: a study in mice

P Faber1, L Garby

  • 1Department of Physiology, Odense University, Denmark.

Acta Physiologica Scandinavica
|February 1, 1995
PubMed
Summary
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The human body's specific heat capacity varies with fat content. This study found obese mice had lower heat capacity (2.65 kJ kg-1 K-1) than lean mice (3.66 kJ kg-1 K-1).

Area of Science:

  • Physiology
  • Biophysics
  • Thermoregulation

Background:

  • The specific heat capacity of the human body is crucial for energy metabolism and temperature regulation studies.
  • A standard value of 3.47 kJ kg-1 K-1 has been used historically, but its dependence on body fat remains uninvestigated.
  • Understanding this relationship is vital for accurate physiological modeling.

Purpose of the Study:

  • To investigate the direct relationship between body fat content and the specific heat capacity of mammalian bodies.
  • To provide empirical data challenging the long-standing, uniform value for human specific heat capacity.

Main Methods:

  • Measurements of specific heat capacity (Cp) were performed on lean and obese mice.
  • Mice were heated and their heat capacity determined using a calorimeter.

Related Experiment Videos

  • Body composition, including fat fraction (mf), fat-free mass, and water content, was measured.

    • Main Results:

    • A significant dependency of specific heat capacity on body fat percentage was observed.
    • Obese mice (52.76% body fat) exhibited a lower heat capacity of 2.65 kJ kg-1 K-1.
    • Lean mice (7.55% body fat) demonstrated a higher heat capacity of 3.66 kJ kg-1 K-1.

    Conclusions:

    • The specific heat capacity of the body is not a fixed value and is influenced by body fat composition.
    • These findings necessitate a re-evaluation of the commonly used specific heat capacity value in physiological calculations.
    • Future research should consider individual body fat variations for more precise metabolic and thermoregulation models.