Abstract
Objective: To examine the differences arising from indexing resting metabolic rate (RMR) against fat-free mass (FFM) determined using two-, three- and four-compartment body composition models.
Design: All RMR and body composition measurements were conducted on the same day for each subject following compliance with premeasurement protocols.
Subjects: Data were generated from measurements on 104 males (age 32.1±12.1 y (mean±s.d.); body mass 81.15±12.85 kg; height 179.5±6.5 cm; body fat 20.6±7.6%).
Interventions: Body density (BD), total body water (TBW) and bone mineral mass (BMM) were measured by hydrodensitometry, deuterium dilution and dual energy X-ray absorptiometry (DXA), respectively. These measures were used to determine two (hydrodensitometry: BD; hydrometry: TBW)-, three (BD and TBW)- and four- compartment (BD, TBW and BMM) FFM values. DXA also provided three compartment derived FFM values. RMR was measured using open circuit indirect calorimetry.
Results: Three (body fat group: lean, moderate, high) × five (body composition determination: hydrodensitometry, hydrometry, three-compartment, DXA, four-compartment) ANOVAs were conducted on FFM and RMR kJ.kg FFM−1.d−1. Within-group comparisons revealed that hydrodensitometry and DXA were associated with significant (P<0.001) overestimations and underestimations of FFM and RMR kJ.kg FFM−1.d−1, respectively, compared with four-compartment-derived criterion values. A significant interaction (P<0.001) resulted from DXA's greater deviations from criterion values in lean subjects. While hydrometric means were not significantly (P≥0.68) different from criterion values intraindividual differences were large (FFM: −1.5 to 2.9 kg; RMR: −6.0 to 3.2 kJ.kg FFM-1.d-1).
Conclusion: The relationship between RMR kJ.kg FFM−1.d−1 and exercise status would best be investigated using three (BD, TBW)- or four (BD, TBW, BMM)-compartment body composition models to determine FFM. Other models either significantly underestimate indexed RMR (hydrodensitometry, DXA) or display large intraindividual differences (hydrometry) compared with four-compartment derived criterion values.
Sponsorship: Australian Research Council (small grants scheme).
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Guarantor: J LaForgia.
Contributors: JLF, GEV, SMG and AGB recruited the subjects, collected and analysed the data; JLF, RTW and GEV conceived and wrote the paper; BEC supervised the DXA scans.
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LaForgia, J., van der Ploeg, G., Withers, R. et al. Impact of indexing resting metabolic rate against fat-free mass determined by different body composition models. Eur J Clin Nutr 58, 1132–1141 (2004). https://doi.org/10.1038/sj.ejcn.1601941
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DOI: https://doi.org/10.1038/sj.ejcn.1601941
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