Effects of pulmonary rehabilitation on lung hyperinflation in patients with COPD: A systematic review and meta-analysis.

In 30 seconds

This systematic review and meta-analysis assessed whether pulmonary rehabilitation (PR) affects static and dynamic lung hyperinflation in people with COPD. Nine studies met the inclusion criteria, and eight contributed to the quantitative synthesis. Across studies, PR was associated with a consistent direction of change toward higher inspiratory capacity and lower RV/TLC ratio and residual volume. However, pooled estimates for some outcomes were not statistically significant. The authors describe the physiological changes as modest and call for further high-quality studies using standardized assessment of dynamic hyperinflation.

Key findings

• Nine studies were included in the review; eight contributed to the quantitative synthesis.
• After PR, changes in inspiratory capacity, RV/TLC ratio, and residual volume consistently favored reduced hyperinflation.
• Pooled estimates for some outcomes did not reach statistical significance.

Why it matters

Lung hyperinflation can contribute to impaired ventilatory mechanics in COPD. The review suggests PR may improve these mechanics, offering a possible physiological contribution to reduced dyspnea and better exercise tolerance. The findings also highlight uncertainty about the size and statistical reliability of these changes, so the evidence supports interest in PR’s effects on hyperinflation without establishing a precise benefit.

What to keep in mind

The evidence came from nine studies, with only eight included in quantitative synthesis; methodological differences and non-significant pooled estimates for some outcomes limit certainty. The authors call for standardized assessment of dynamic hyperinflation.