| Abstract [eng] |
Most of people who suffer from chronic muscle pain in facial area are diagnosed with myofascial pain syndrome. It affects chewing muscles therefore the amplitude of jaw movement is decreased. It has localized pain and causes great discomfort to organs, that run almost nonstop in human lives – when we speak, eat, etc. Surface electromyography and invasive EMG are used in medical practice as muscle tone exams. Invasive electromyography is able to investigate small part of the muscle - one or more motor units. Surface electromyography covers a large number of motor units and records superpositioned myographic signal. Benefits of invasive EMG were seen during researches of muscle motor units. The action potential and its shape analysis allows basic identification and classification of motor units. Due to discomfort and risk to the patient, there are more and more attempts to capture electromyographic signs of pain using surface EMG method. Muscle tone changes are often recorded using surface electrodes, however, there is a lot of other artefacts that impact the amplitude of EMG. This paper presents EMG database collected during the investigation of patients and healthy people facial muscles and signal (muscle tone) analysis to confirm or deny the amplitudal changes in connection with painful muscles. Furthermore, signals are analyzed using frequency and spectral EMG parameters in addition to studying their variability and connection with myofascial pain syndrome. |
