![]() ![]() ![]() In patients, the LI of the frontal and zygomatic muscles correlated significantly with the H&B ( r = −0.83, p = 0.001 and r = −0.65, p = 0.023). Results: In healthy subjects, a good correlation was measured between the mean EMG amplitudes of the custom-made and commercial EMG device for both frontal ( r = 0.84, p = 0.001) and zygomatic muscles ( r = 0.8, p = 0.002). Here, the ratio between the mean EMG amplitude of the healthy and affected side was calculated and related to the facial function as measured by the House and Brackmann scale (H&B) ranging from 1 (normal) to 6 (total paralysis). Subsequently, the custom-made device was applied to 12 patients with and without postoperative facial paresis after neurosurgical intervention. ![]() First, the mean EMG amplitudes and movement onset detection rates (ACC) achieved with the custom-made EMG system were compared with a commercial EMG device in 12 healthy subjects. Methods: This prospective study describes a custom-made EMG system, consisting of a microcontroller board and muscle sensors, which was used to record the EMG of frontal and zygomatic facial muscles during frowning and smiling. In the present study, we designed and evaluated a custom-made EMG biofeedback system enabling cost-effective facial rehabilitation. In these situations, biofeedback of facial electromyographic (EMG) signals enables the visual representation of the rehabilitation progress, even without apparent facial movements. However, in the early rehabilitation phase, voluntary movements are often limited, and thus, the motivation of patients is impacted.
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