Figure 3
From: Oral vs. pharyngeal dysphagia: surface electromyography randomized study
A typical test of three single normal swallows of a person, 24 hours after dental surgery. The complete electric activity of muscles during swallow is longer (here 5.21 sec) that normal swallow of a healthy person. The submental and infrahyoid peaks are normal (upper and middle lines), the masseter line (lower line) shows the lack of peaks. The Masseter almost does not work.