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  • Original Article
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Body composition, energy expenditure and physical activity

Prediction of basal metabolic rate in patients with Prader–Willi syndrome

European Journal of Clinical Nutrition volume 70, pages 494–498 (2016)Cite this article

Subjects

Abstract

Background/Objectives:

The objective of this study was to develop new equations for predicting basal metabolic rate (BMR) in Prader–Willi syndrome (PWS) subjects and to compare their accuracy with commonly used equations developed by Lazzer (2007), Livingston (2005), Huang (2004), Nelson (1992), Mifflin (1990), Owen (1987), WHO (1985), Bernstein (1983) and Harris–Benedict (1919), using the Bland–Altman method.

Subjects/Methods:

BMR was measured by indirect calorimetry and fat-free mass (FFM) and fat mass (FM) by a tetrapolar impedancemeter in 80 Caucasian PWS patients (mean body mass index: 39.1 kg/m2; 17–50 years). Equations were derived by stepwise multiple regression analysis using a calibration group (n:50) and tested against the validation group (n:30).

Results:

Two new equations, based on anthropometric (BMR=body mass × 0.052+sex × 0.778–age × 0.033+2.839 (R2adj=0.61, s.e.=0.89 MJ per day)) or body composition (BMR=FFMx0.074+FMx0.042+sexx0.636–agex0.037+2.515 (R2adj=0.69, s.e.=0.82 MJ per day)), were generated. Predicted BMR (PBMR) was not significantly different from the measured BMR (<3.3%), and was accurate in 59% and 62% of patients, respectively. Nevertheless, significant magnitude bias was found for both equations (P<0.001, R2=0.36). The Owen (1987), Mifflin (1990), Huang (2004) and Lazzer (2007) equations showed mean differences <5% and PBMR was accurate in ~50% of patients. The Livingston (2005), WHO (1985) and Harris–Benedict (1919) equations showed a PBMR overestimation >7% and were accurate in <50% of patients. The Nelson (1992) and Bernstein (1983) equations showed a greater PBMR underestimation in >60% of subjects.

Conclusions:

The new prediction equations showed significantly higher accuracy compared with equations tested, with exception of Lazzer (2007) and Livingston (2005) equations, and result in lower mean differences and lower limits of agreement compared with the equations tested.

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Acknowledgements

We are grateful to the patients for their kind collaboration, and the nursing staff at the Division of Auxology, Istituto Auxologico Italiano, IRCCS, Piancavallo (VB) for their qualified assistance during the clinical study. The study was supported by Progetti di Ricerca Corrente, Italian Institute for Auxology, Milan, Italy.

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Authors and Affiliations

  1. Department of Medical and Biological Sciences, University of Udine, Udine, Italy

    S Lazzer

  2. Istituto Auxologico Italiano, IRCCS, Experimental Laboratory for Auxo-Endocrinological Research, Piancavallo (VB), Italy

    S Lazzer, G Grugni, G Tringali & A Sartorio

  3. Division of Auxology, Istituto Auxologico Italiano, IRCCS, IRCCS, Milan, Italy

    G Grugni & A Sartorio

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  1. S Lazzer
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Correspondence to S Lazzer.

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Lazzer, S., Grugni, G., Tringali, G. et al. Prediction of basal metabolic rate in patients with Prader–Willi syndrome. Eur J Clin Nutr 70, 494–498 (2016). https://doi.org/10.1038/ejcn.2015.161

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