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Prevalence of an elevated resting energy expenditure in patients with chronic obstructive pulmonary disease in relation to body composition and lung function.

Abstract：

OBJECTIVE:This study describes the prevalence and characteristics of an elevated resting energy expenditure (REE) in patients with chronic obstructive pulmonary disease (COPD). DESIGN AND SETTING:Patients were consecutively admitted to an in-patient pulmonary rehabilitation centre. SUBJECTS:The study group consisted of 172 (123 males) clinically stable patients with COPD, age mean (s.d.) 64(10) y). INTERVENTIONS:REE was assessed by indirect calorimetry (ventilated hood) and adjusted for the influence of fat-free mass (FFM; measured by bioelectrical impedance analysis) using the linear regression equations of REE on FFM generated in 92 healthy age-matched subjects (58 males, age 67(8) y) for men and women separately. The predicted REE adjusted for FFM (REEFFM) was obtained by using the FFM of each individual patient in the linear regression equation of REE on FFM generated in the healthy control group. RESULTS:26% of the patients were hypermetabolic (defined as REE > 110% REEFFM), characterized by a lower age (60 (10) vs 65 (9) y) and a lower total lung capacity (TLC; 122(27)vs 139(28) %pred) compared to normometabolic patients (P < 0.001). The prevalence of FFM-depletion was equal among normo- and hypermetabolic patients: 36% vs 33% respectively. Depleted patients expressed however a significantly higher residual volume/TLC ratio and a lower maximal inspiratory mouth pressure independently of hypermetabolism (P < 0.05). In contrast, on base of the Harris & Benedict (HB) prediction equations, which do not take body composition into account, 54% of the patients were hypermetabolic (REE > 110% REEHB), characterized by a higher age and a lower body mass and FFM (P < 0.05). CONCLUSIONS:Hypermetabolism commonly occurs in COPD, characterized by less hyperinflation at rest, in contrast to the suggested contribution of an elevated oxygen cost of breathing (OCB) to hypermetabolism in COPD. The higher hyperinflation at rest in FFM-depleted patients independently of hypermetabolism suggests a higher OCB during activities, contributing to the elevated total daily energy expenditure previously reported in COPD. The HB-equations overestimate the prevalence of hypermetabolism and link hypermetabolism incorrectly to aging and depletion.

journal_name

Eur J Clin Nutr

journal_title

European journal of clinical nutrition

authors

Creutzberg EC,Schols AM,Bothmer-Quaedvlieg FC,Wouters EF

doi

10.1038/sj.ejcn.1600571

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

396-401

issue

eissn

0954-3007

issn

1476-5640

journal_volume

pub_type

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Prevalence of an elevated resting energy expenditure in patients with chronic obstructive pulmonary disease in relation to body composition and lung function.