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Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements

BACKGROUND: The doubly-labeled water (DLW) method is the gold standard methodology for determination of free-living, total daily energy expenditure (TEE). However, there is no single accepted approach for either the sampling protocols (daily vs. two-point, in which samples are collected after dosing...

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Autores principales: Berman, Elena S.F., Swibas, Tracy, Kohrt, Wendy M., Catenacci, Vicki A., Creasy, Seth A., Melanson, Edward L., Speakman, John R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7028494/
https://www.ncbi.nlm.nih.gov/pubmed/31427762
http://dx.doi.org/10.1038/s41430-019-0492-z
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author Berman, Elena S.F.
Swibas, Tracy
Kohrt, Wendy M.
Catenacci, Vicki A.
Creasy, Seth A.
Melanson, Edward L.
Speakman, John R.
author_facet Berman, Elena S.F.
Swibas, Tracy
Kohrt, Wendy M.
Catenacci, Vicki A.
Creasy, Seth A.
Melanson, Edward L.
Speakman, John R.
author_sort Berman, Elena S.F.
collection PubMed
description BACKGROUND: The doubly-labeled water (DLW) method is the gold standard methodology for determination of free-living, total daily energy expenditure (TEE). However, there is no single accepted approach for either the sampling protocols (daily vs. two-point, in which samples are collected after dosing and at the end of the measurement period) or the calculations used in the determination of the rate of carbon dioxide production (rCO(2)) and TEE. Moreover, fluctuations in natural background abundances introduce error in the calculation of rCO(2) and TEE. The advent of new technologies makes feasible the possibility of including additional isotope measures ((17)O) to account for background variation, which may improve accuracy. METHODS: Sixteen subjects were studied for 7 consecutive days in a whole-room indirect calorimeter (IC) with concurrent measurement of TEE by DLW. Daily urine samples were obtained and isotope ratios determined using off-axis integrated cavity output spectroscopy (OA-ICOS). RESULTS: We determined the best combination of approaches for estimating dilution spaces, elimination rates, and calculated average daily carbon dioxide production (VCO(2)) using six different published equations. Using the best combination, multi-point fitting of isotope elimination rates using the daily urine samples substantially improved the average precision (4.5% vs. 6.0%) and accuracy (−0.5% vs. −3.0%) compared with the two-point method. This improvement may partly reflect the less variable day-to-day chamber measurements of energy expenditure. Utilizing (17)O measurements to correct for errors due to background isotope fluctuations provided additional but minor improvements in precision (4.2% vs. 4.5%) and accuracy (0.2% vs. 0.5%). CONCLUSIONS: This work shows that optimizing sampling and calculation protocols can improve the accuracy and precision of DLW measurements.
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spelling pubmed-70284942020-03-12 Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements Berman, Elena S.F. Swibas, Tracy Kohrt, Wendy M. Catenacci, Vicki A. Creasy, Seth A. Melanson, Edward L. Speakman, John R. Eur J Clin Nutr Article BACKGROUND: The doubly-labeled water (DLW) method is the gold standard methodology for determination of free-living, total daily energy expenditure (TEE). However, there is no single accepted approach for either the sampling protocols (daily vs. two-point, in which samples are collected after dosing and at the end of the measurement period) or the calculations used in the determination of the rate of carbon dioxide production (rCO(2)) and TEE. Moreover, fluctuations in natural background abundances introduce error in the calculation of rCO(2) and TEE. The advent of new technologies makes feasible the possibility of including additional isotope measures ((17)O) to account for background variation, which may improve accuracy. METHODS: Sixteen subjects were studied for 7 consecutive days in a whole-room indirect calorimeter (IC) with concurrent measurement of TEE by DLW. Daily urine samples were obtained and isotope ratios determined using off-axis integrated cavity output spectroscopy (OA-ICOS). RESULTS: We determined the best combination of approaches for estimating dilution spaces, elimination rates, and calculated average daily carbon dioxide production (VCO(2)) using six different published equations. Using the best combination, multi-point fitting of isotope elimination rates using the daily urine samples substantially improved the average precision (4.5% vs. 6.0%) and accuracy (−0.5% vs. −3.0%) compared with the two-point method. This improvement may partly reflect the less variable day-to-day chamber measurements of energy expenditure. Utilizing (17)O measurements to correct for errors due to background isotope fluctuations provided additional but minor improvements in precision (4.2% vs. 4.5%) and accuracy (0.2% vs. 0.5%). CONCLUSIONS: This work shows that optimizing sampling and calculation protocols can improve the accuracy and precision of DLW measurements. 2019-08-19 2020-03 /pmc/articles/PMC7028494/ /pubmed/31427762 http://dx.doi.org/10.1038/s41430-019-0492-z Text en Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms
spellingShingle Article
Berman, Elena S.F.
Swibas, Tracy
Kohrt, Wendy M.
Catenacci, Vicki A.
Creasy, Seth A.
Melanson, Edward L.
Speakman, John R.
Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements
title Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements
title_full Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements
title_fullStr Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements
title_full_unstemmed Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements
title_short Maximizing Precision and Accuracy of the Doubly Labeled Water Method via Optimal Sampling Protocol, Calculation Choices, and Incorporation of (17)O Measurements
title_sort maximizing precision and accuracy of the doubly labeled water method via optimal sampling protocol, calculation choices, and incorporation of (17)o measurements
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7028494/
https://www.ncbi.nlm.nih.gov/pubmed/31427762
http://dx.doi.org/10.1038/s41430-019-0492-z
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