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Related Experiment Videos

Variability in energy expenditure and its components.

William T Donahoo1, James A Levine, Edward L Melanson

  • 1Department of Medicine, Section of Endocrinology, Diabetes, and Metabolism, University of Vermont, Burlington, Vermont, USA.

Current Opinion in Clinical Nutrition and Metabolic Care
|November 10, 2004
PubMed
Summary

Total daily energy expenditure varies significantly due to nonexercise activity, not resting metabolic rate or diet. Understanding factors influencing nonexercise activity is key to explaining energy expenditure variability.

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Area of Science:

  • Human physiology
  • Metabolic research
  • Energy balance studies

Background:

  • Total daily energy expenditure (TDEE) is influenced by multiple components.
  • Understanding variability in TDEE is crucial for metabolic health research.
  • Key components include resting metabolic rate (RMR), diet-induced thermogenesis (DIT), and activity thermogenesis.

Purpose of the Study:

  • To review factors contributing to variation in TDEE and its components.
  • To assess the intra-individual variability of RMR, DIT, and activity thermogenesis.
  • To examine the reproducibility of TDEE measurements.

Main Methods:

  • Literature review of studies on energy expenditure components.
  • Analysis of coefficients of variation for RMR, DIT, and activity thermogenesis.

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  • Review of studies measuring 24-hour energy expenditure variability.

    • Main Results:

    • RMR, DIT, and exercise energy expenditure show high reproducibility.
    • Nonexercise activity thermogenesis (NEAT) exhibits significant variability (around 20%).
    • TDEE variability is primarily driven by NEAT, not RMR, DIT, or exercise.

    Conclusions:

    • RMR, DIT, exercise, and 24-hour energy expenditure are highly reproducible.
    • NEAT is the main driver of variability in total daily energy expenditure.
    • Factors influencing NEAT are known, but their quantitative impact on TDEE remains unclear.