Speakman, JR, Yamada, Y, Sagayama, H, Berman, ESF, Ainslie, PN, Andersen, LF, Anderson, LJ, Arab, L, Baddou, I, Bedu-Addo, K, Blaak, EE, Blanc, S, Bonomi, AG, Bouten, CVC, Bovet, P, Buchowski, MS, Butte, NF, Camps, SGJA, Close, GL, Cooper, JA et al, Creasy, SA, Das, SK, Cooper, R, Dugas, LR, Ebbeling, CB, Ekelund, U, Entringer, S, Forrester, T, Fudge, BW, Goris, AH, Gurven, M, Hambly, C, El Hamdouchi, A, Hoos, MB, Hu, S, Joonas, N, Joosen, AM, Katzmarzyk, P, Kempen, KP, Kimura, M, Kraus, WE, Kushner, RF, Lambert, EV, Leonard, WR, Lessan, N, Ludwig, DS, Martin, CK, Medin, AC, Meijer, EP, Morehen, JC, Morton, JP, Neuhouser, ML, Nicklas, TA, Ojiambo, RM, Pietiläinen, KH, Pitsiladis, YP, Plange-Rhule, J, Plasqui, G, Prentice, RL, Rabinovich, RA, Racette, SB, Raichlen, DA, Ravussin, E, Reynolds, RM, Roberts, SB, Schuit, AJ, Sjödin, AM, Stice, E, Urlacher, SS, Valenti, G, Van Etten, LM, Van Mil, EA, Wells, JCK, Wilson, G, Wood, BM, Yanovski, J, Yoshida, T, Zhang, X, Murphy-Alford, AJ, Loechl, CU, Melanson, EL, Luke, AH, Pontzer, H, Rood, J, Schoeller, DA, Westerterp, KR, Wong, WW and IAEA DLW database group, (2021) A standard calculation methodology for human doubly labeled water studies. Cell Reports Medicine, 2 (2). ISSN 2666-3791

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Abstract

The doubly labeled water (DLW) method measures total energy expenditure (TEE) in free-living subjects. Several equations are used to convert isotopic data into TEE. Using the International Atomic Energy Agency (IAEA) DLW database (5,756 measurements of adults and children), we show considerable variability is introduced by different equations. The estimated rCO2 is sensitive to the dilution space ratio (DSR) of the two isotopes. Based on performance in validation studies, we propose a new equation based on a new estimate of the mean DSR. The DSR is lower at low body masses (<10 kg). Using data for 1,021 babies and infants, we show that the DSR varies non-linearly with body mass between 0 and 10 kg. Using this relationship to predict DSR from weight provides an equation for rCO2 over this size range that agrees well with indirect calorimetry (average difference 0.64%; SD = 12.2%). We propose adoption of these equations in future studies.

Item Type:	Article
Uncontrolled Keywords:	doubly labeled water; free-living; total energy expenditure; validation
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport & Exercise Sciences
Publisher:	Cell Press
Related URLs:	Author
Date Deposited:	15 Mar 2021 13:07
Last Modified:	04 Sep 2021 05:46
DOI or ID number:	10.1016/j.xcrm.2021.100203
URI:	https://researchonline.ljmu.ac.uk/id/eprint/14613

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