HRMI combines the evaluation of bolus flow patterns (impedance) and pressure (manometry) generated during swallowing.~20 healthy volunteers will participate, of which 10 will receive PES stimulation and 10 will receive Sham treatment.~60 patients with dysphagia after acute first stroke will be included. 20 will receive PES stimulation twice, 20 will receive PES stimulation and afterwards Sham and 20 will receive Sham twice.
The goal of this clinical trial is to clarify which biomechanical aspects of swallowing are altered by Pharyngeal Electrical Stimulation (PES) in stroke patients and healthy volunteers.~The peripheral effect of PES intervention on the biomechanics of swallowing will be evaluated with High Resolution Manometry Impedance (HRMI).