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The relationship between electromyogram recorded from the diaphragm (EMGdi) expressed as a percentage of maximum (% max) at the breathlessness threshold (Borg score 1) during exercise and resting lung function, measured in 15 patients with cystic fibrosis. FEV1: forced expiratory volume in 1 s; % pred: % predicted; VC: vital capacity; TLC: total lung capacity; RV: residual volume.
