Ventilator-induced diaphragmatic dysfunction appears to contribute to slow weaning from mechanical ventilation. Several trials of inspiratory muscle training to facilitate weaning in intensive care have been performed, with inconsistent results, utilizing different methods of IMT in different populations. To perform the best IMT program, we need to know the physio-pathology of the diaphragm in difficult to wean patients. This study proposes to discriminate the two main characteristics of the inspiratory muscles: strength and endurance. By analyzing the evolution of strength and endurance during all the weaning period, we want to know which characteristic has the more deficiency to adapt in a second time an effective program of IMT.
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Maximal Inspiratory Pressure score assessment
Timeframe: Daily measure (from inclusion day (day 1) to extubation day (maximum day 28))