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Summary of the study. ITL: inspiratory threshold loading; CO2-rv: carbon dioxide stimulation with restriction of the reflex ventilatory response; VAS: visual analogue scale; S-VAS: sensory dyspnoea VAS; A-VAS: affective dyspnoea VAS; EEG: electroencephalogram; MDP: Multidimensional Dyspnea Profile. *: p<0.05.
