Schematic diagram of the potential psychophysiological mechanism of perception of breathlessness in obese adults with dyspnoea on exertion. 1: increased afferent feedback; 2: increased corollary discharge from the respiratory control centre; 3: decreased ga... Schematic diagram of the potential psychophysiological mechanism of perception of breathlessness in obese adults with dyspnoea on exertion. 1: increased afferent feedback; 2: increased corollary discharge from the respiratory control centre; 3: decreased gating threshold for sensory transmission; 4: decreased or increased input from gating modifiers. V′O2: oxygen uptake; PaCO2: arterial carbon dioxide tension. Reproduced from [24] with permission from the publisher. Vipa Bernhardt, and Tony G. Babb Eur Respir Rev 2016;25:487-495 ©2016 by European Respiratory Society