Rheumatology Advance Access first published online on February 27, 2008
This version published online on March 15, 2008
Rheumatology, doi:10.1093/rheumatology/ken022
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New resting energy expenditure prediction equations for patients with rheumatoid arthritis
1School of Sport, Performing Arts and Leisure, University of Wolverhampton, Walsall, 2Department of Rheumatology, Dudley Group of Hospitals NHS Trust, Russell's Hall Hospital, Dudley, UK, 3Research Institute in Physical Performance and Rehabilitation, Centre for Research and Technology—Thessaly, Trikala, Greece and 4ARC Epidemiology Unit, University of Manchester, Manchester, UK.
Correspondence to:
G. S. Metsios, School of Sport, Performing Arts and Leisure, University of Wolverhampton, Gorway rd, Walsall Campus, Wolverhampton, WSI 3BD, UK. E-mail: G.Metsios{at}wlv.ac.uk
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Abstract |
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Objectives. Resting energy expenditure (REE), one of the main components of total energy expenditure, can be measured via indirect calorimetry and/or predicted from equations. The latter may be misleading in RA, as they do not take into account the metabolic alterations occurring in RA. The objectives of this study are to evaluate the accuracy of widely used REE-predictive equations in RA patients against measured REE and to develop RA-specific equations.
Methods. We assessed REE (via indirect calorimetry and several predictive equations), fat-free mass (FFM; via bioelectrical impedance) and disease activity (CRP) in RA patients and healthy controls. Data from 60 RA patients (experimental group) were used to assess the accuracy of existing REE equations and to develop new equations. The new equations were validated in an independent cross-validation group of 22 RA patients. These two groups were merged and two final equations were developed.
Results. All equations significantly under-predicted measured REE (from 15% to 18.2%, all at P < 0.001) in the RA experimental group, but not in the control group. After both equations demonstrated a high validity in the cross-validation group, the new final REE prediction equations developed from the total RA sample (n = 82) were: Model 1: REE (kcal/day) = 126.1 x FFM0.638 x CRP0.045 (R2 = 0.70) and Model 2: REE (kcal/day) = 598.8 x weight0.47 x age–0.29 x CRP0.066 (R2 = 0.62).
Conclusion. The new equations provide an accurate prediction of REE in RA patients and could be used for clinical monitoring of resting metabolism of these patients without the requirement for specialized personnel.
KEY WORDS: Resting energy expenditure, Metabolism, Equation, Prediction
The title of the paper has been changed from ‘New resting energy expenditure prediction equations for patients with RA’ to ‘New resting energy expenditure prediction equations for patients with rheumatoid arthritis’.
Submitted 14 May 2007;
revised version accepted 10 January 2008.
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