Energy balance
The non-linear relationship between Resting Energy Expenditure (REE) and Fat-Free Mass (FFM) is explained by the changing proportion of metabolically active organ mass to skeletal muscle as body size increases.
If you are larger, your resting metabolism per pound of lean tissue is lower than that of a smaller person. This is because your vital organs, which burn the most energy, make up a smaller fraction of your total body weight. Simple linear formulas often overestimate the metabolic cost of large amounts of skeletal muscle.
The slope of REE on FFM is lower at high FFM and vice versa it is higher at low FFM. Thus, REE on FFM decreases with increasing FFM... The composition of FFM may explain this phenomenon.
Why this rating
Supported by regression analysis of 103+ subjects using imaging technologies.
Source
Metabolically active components of fat‐free mass and resting energy expenditure in humans: recent lessons from imaging technologies
Manfred J. Müller et al. · Obesity Reviews · 2002
DOI 10.1046/j.1467-789x.2002.00057.x
More from this paper
- Resting energy expenditure (REE) is determined primarily by the mass of metabolically active organs (brain, liver, heart, kidneys) rather than total fat-free mass or skeletal muscle, as organs constitute only ~5% of body weight but contribute 70-80% of REE.Good
- Resting Energy Expenditure can be accurately reconstructed from detailed body composition analysis using MRI or CT-derived organ masses multiplied by constant organ tissue-respiration rates.Good
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