Abstract
Objective: To evaluate whether the doubly labeled water (DLW) method is precise under conditions required for a large-scale evaluation of dietary intake instruments.
Design: Energy expenditure was measured in 484 subjects (main study). Subjects received one of five different weight DLW dose bottles prepared in advance of the study. A repeat energy expenditure measure was obtained in a subset of 24 subjects (substudy). DLW measures of energy expenditure were performed over a 2-week interval with urine collection at the beginning and end.
Setting: Free-living environment with three clinic visits in the Maryland suburban area of Washington, DC.
Subjects: A total of 484 subjects (261 men and 223 women) aged 40–69 y, 24 of whom (13 men and 11 women) participated in a substudy in which DLW was administered a second time.
Results: The coefficient of variation of the DLW energy expenditure measurement was 5.1%. This included a 2.9% analytical and a 4.2% physiologic variation. Based on observed initial isotopic enrichment, the preweighed dosages were optimal in 70% of the main study subjects, and 9% received a dose that was less than optimal. Only six subjects (1%) were excluded because the final isotopic enrichment was too low to conduct precise measurement.
Conclusions: Use of preweighed DLW dosages did not compromise the precision of the DLW method. The DLW method is a reliable measure of energy expenditure for large-scale evaluations of dietary intake instruments.
Sponsorship: The National Cancer Institute.
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Notes
Permil is a one part per thousand (‰) change in the ratio of the heavy to light isotope—that is (Rsample/Rstandard−1) × 1000, where R is the molar ratio of the heavy (2H) to light (1H) isotope abundance. A 1 permil change in 18O or 2H enrichment corresponds to the addition of 2 mol of 18O-hydride or 0.16 mol 2H oxide to 106 mol of water, respectively.
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Trabulsi, J., Troiano, R., Subar, A. et al. Precision of the doubly labeled water method in a large-scale application: evaluation of a streamlined-dosing protocol in the Observing Protein and Energy Nutrition (OPEN) study. Eur J Clin Nutr 57, 1370–1377 (2003). https://doi.org/10.1038/sj.ejcn.1601698
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DOI: https://doi.org/10.1038/sj.ejcn.1601698
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