Mean power frequency during speech in myalgia patients

Area of Science:

• Biomedical Engineering
• Neuroscience
• Musculoskeletal Disorders

Background:

• Myofascial pain in the masseter muscles, known as myalgia, affects speech.
• Electromyography (EMG) measures muscle electrical activity.
• Mean Power Frequency (MPF) is an EMG analysis parameter reflecting muscle fiber characteristics.

Purpose of the Study:

• To investigate differences in masseter muscle MPF during speech between individuals with myalgia and healthy controls.
• To explore the potential of MPF as an objective measure for muscle pain.

Main Methods:

• Surface EMG of bilateral masseter muscles was recorded during speech tasks.
• EMG data were analyzed using a computer-based system to calculate MPF.
• MPF values were compared between the myalgia patient group (n=19) and the control group (n=20).

Main Results:

• The myalgia group demonstrated significantly higher average MPF during speech (214.06 Hz) compared to the control group (183.39 Hz).
• The difference in MPF between groups was statistically significant (P < 0.001).
• Higher MPF in myalgia patients may indicate altered motor unit recruitment or firing rates.

Conclusions:

• Speech-induced masseter muscle activity shows distinct MPF characteristics in individuals with myalgia.
• MPF analysis of EMG signals during speech presents a potential objective method for assessing subjective muscle pain.
• This research highlights a link between objective EMG measures and the subjective experience of muscle pain.