Active expiration during exercise can increase intrathoracic pressure yielding concavity in
the expiratory flow-volume loop in COPD. We investigated the relationship between this …

During heavy exercise in chronic obstructive pulmonary disease (COPD), dynamic airways
compression leads to a progressive fall in intrabreath flow. This is manifested by concavity in …

The inability to engage in sustained physical activity is a common feature of chronic
obstructive pulmonary disease (COPD) and contributes importantly to the perception of poor …

Study objective Estimating lung volume using inspiratory capacity (IC) maneuvers is a useful
way of tracking dynamic hyperinflation. An understanding of the repeatability of the IC in a …

Increased expiratory muscle activity is common during exercise in patients with COPD but its
role in modulating operating lung volumes and dyspnea during incremental cycle ergometry …

Background: Dynamic hyperinflation of the lungs impairs exercise performance in chronic
obstructive pulmonary disease (COPD). However, it is unclear which patients are affected by …

In COPD, dynamic hyperinflation (DH) occurs during exercise and during metronome-paced
tachypnea (MPT). We investigated the relationship of DH with breathing pattern and …

Expiratory flow limitation (FL) at rest is frequently present in chronic obstructive pulmonary
disease (COPD) patients. It promotes dynamic hyperinflation with a consequent decrease in …

During exercise, dynamic hyperinflation-induced intrinsic positive end-expiratory pressure
(PEEPi) and decreased dynamic lung compliance (CL, dyn) of patients with chronic …

Ventilatory capacity is reduced in chronic obstructive pulmonary disease (COPD) patients.
Tidal volume (VT) is lower and breathing frequency higher at a given ventilation (VE) …