Ora et al.
explore the relationship between obesity and operating lung
volumes in patients with moderate to severe COPD.
Contrary to current beliefs, the combination of obesity and
COPD was not associated with diminished exercise capacity
or greater dyspnea compared with normal weight patients with
similar reduction in FEV1. They found also, relatively reduced
lung hyperinflation in obese patients with COPD due to
reduced operating lung volumes at rest [21].