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Frequency analysis of electromyographic signals in mandibular elevators at maximum clench level
1Prosthodontic Department, Stomatological Hospital, Fourth Military Medical University, Xian Shaanxi, Peoples' Republic of China.
Journal of Oral Rehabilitation
|July 1, 1992
Summary
Investigating muscle fatigue in the jaw, this study found that mean power frequency (MPF) in electromyograms (EMG) decreases with sustained contraction time. This relationship may help detect jaw muscle fatigue.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Kinesiology
Background:
- Understanding muscular fatigue is crucial for diagnosing and managing conditions affecting the stomatognathic system.
- Electromyography (EMG) is a common tool for assessing muscle activity and fatigue.
- Power spectral analysis of EMG signals, particularly mean power frequency (MPF), offers insights into muscle fiber changes during exertion.
Purpose of the Study:
- To investigate the relationship between mean power frequency (MPF) derived from electromyogram (EMG) signals and the duration of sustained muscle contractions.
- To determine if MPF changes can serve as an indicator of muscular fatigue in the jaw muscles.
Main Methods:
- Surface EMG activity was recorded from the masseter and anterior temporal muscles of seven healthy subjects.
- Subjects performed sustained clenching at maximum voluntary contraction level, with visual feedback to maintain intensity.
- Linear regression analysis was used to correlate MPF with sustained contraction time.
Main Results:
- A significant negative correlation was observed between MPF and sustained contraction time.
- As contraction time increased, the MPF of the EMG signal decreased, indicating a decline in muscle function.
Conclusions:
- The rate of change in MPF over time during sustained contractions is a potential biomarker for muscular fatigue.
- This method may be valuable for detecting and quantifying muscle fatigue within the stomatognathic system.