Respiratory function and the obesity paradox.

Abstract:

PURPOSE OF REVIEW:Obese individuals have impaired respiratory function relative to their normal-weight counterparts. Despite these negative effects, obesity is paradoxically associated with better survival in individuals with chronic obstructive pulmonary disease (COPD). The purpose of this review is to describe this 'obesity paradox', to discuss the effects of obesity on respiratory function, and to speculate as to whether obesity-related alterations in respiratory mechanics can influence the natural history of COPD. RECENT FINDINGS:Given the known negative effects of obesity on respiratory physiology, it is reasonable to predict that obese COPD patients would be more likely to experience greater dyspnea and exercise intolerance relative to COPD patients of normal weight. However, recent evidence suggests that obese COPD patients have similar or better dyspnea scores during exercise and do not have diminished exercise capacity. These observations may be attributable to the fact that obese COPD patients have reduced operating lung volumes and higher inspiratory capacity to total lung capacity ratios than their lean COPD counterparts. SUMMARY:Obese patients with COPD do not appear to be at a disadvantage during exercise relative to lean COPD patients. Obesity may be associated with improved survival in COPD but specific mechanisms for this paradox remain to be elucidated.

authors

Guenette JA,Jensen D,O'Donnell DE

doi

10.1097/MCO.0b013e32833e3453

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

618-24

issue

6

eissn

1363-1950

issn

1473-6519

pii

00075197-201011000-00004

journal_volume

13

pub_type

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