Energy balance
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.
For young, healthy adults, you can accurately predict your resting metabolism if you know your exact organ masses (via MRI/CT). However, this is currently impractical for most people. For general use, knowing your trunk lean mass is a better predictor than total body weight or simple muscle mass.
Calculating REE from the sum of individual OM multiplied by a constant organ tissue-respiration rate showed a high correlation between calculated and measured REE, with only small and non-significant differences of 83–96 kJ d–1.
Why this rating
Based on high correlation (r=0.92) in multiple studies, though accuracy decreases in older adults.
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
- 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.Good
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