Background Mechanical assistance cough for patients with neuromuscular disorders (NMD) are known, but there is no adaptation model established. Currently is performed subjectively by the physiotherapist following the pressures recommended in the current literature as optimal (±40CmH2O). To check is these pressures are the most optimal pressures to achieve the better peak cough flow (PCF) monitoring cough assist (Mechanical insuffllation-exsuflattion MI-E) maneuvers and analyzing pressure- flow / time curves