“Exertional dyspnoea in COPD: the clinical utility of cardiopulmonary exercise testing.” Denis E. O'Donnell, Amany F. Elbehairy, Azmy Faisal, Katherine A. Webb, J. Alberto Neder and Donald A. Mahler. Eur Respir Rev 2016; 25: 333–347.

Unfortunately panel c of figure 4 in this article was presented incorrectly. Please find the correct figure below.

FIGURE 4.

Exertional dyspnoea intensity is shown relative to a) work rate and b) diaphragm electromyography relative to maximum (EMGdi/EMGdi,max) during incremental cycle exercise in patients with moderate chronic obstructive pulmonary disease (COPD) and age-matched healthy controls. c) Selected qualitative dyspnoea descriptors at the end of incremental cycle exercise in patients with moderate COPD and age-matched healthy controls. d) The relationship between tidal volume (V_T) as a function of predicted vital capacity (VC_pred) and EMGdi/EMGdi,max. Square symbols represent the tidal volume-ventilation inflection points in panels a) and d) and the point at the highest equivalent ventilation (50 L·min⁻¹) in panel b). Data are presented as mean±sem. *: p<0.05 COPD versus healthy controls at rest, at standardised work rates or at peak exercise. Reproduced and modified from [17] with permission.