The characteristics of surface electromyography of trapezius muscle during sleep
Date Issued
2008
Date
2008
Author(s)
Kang, Jiunn-Horng
Abstract
Backgroundrapezius muscle is a posture muscle to maintain human shoulder-neck stability. Trapezius myalgia (TM) is a common problem in the general clinic. Previous studies indicated TM may be related to mal-posture or biomechanical loading which result in microtrauma of muscle microstructure. However, the correlation of pain and surface electromyographic (sEMG) findings of TM patients is low or insignificant in many studies. However, elevated of sEMG activities of trapezius during sleep was showed in TM patients and the mechanism was unknown. There were still scanty studies to explore the sEMG characteristics of trapezius muscle during sleep. A recent study showed a very low frequency (VLF) oscillation of trapezius sEMG occurred during sleep. This phenomenon may be related to oscillation activities of motor cortex during sleep. Analysis the trapezius sEMG data with other electrophysiological data during sleep in healthy subjects is a necessary to understand the trapezius. Our study’s goal is to analyze the sEMG pattern of trapezius muscles and their association with EEG during sleep. aterials and Methods5 healthy female subjects were recruited for complete polysomnographic studies with additional sEMG recording of bilateral trapezius muscles. The raw data of EEG and sEMG of trapezius were extracted and processed. Root mean square (RMS) of sEMG of bilateral trapezius muscle was calculated. Fast Fournier Transform (FFT) of 16-s window of two signals was analyzed. Coupling spectrum of EEG and contralateral sEMG signal was computed by calculated the product of the power of two signals in every frequency. Paired-t test and Pearson’s correlation were applied to analyze the difference between bilateral sides and correlation of power spectrum between EEG and sEMG of trapezius muscles. One way ANOVA was applied to compare the VLF power of coupling spectrum among the sleep stages.esults and Conclusionhe trapezius sEMG had low-level activities during sleep and the mean of RMS was 1.3 % of RMS of maximal contraction. We confirmed that the VLF oscillation of trapezius sEMG signals occurred intermittently during sleep. The mean duration of occurrence of VLF of trapezius sEMG was 96 seconds. The mean of longest duration of VLF was about 27 minutes. The power of VLF of trapezius sEMG spectrum was positively correlated with the power of VLF of EEG spectrum significantly (mean right r = 0.47, left r = 0.39). The power of coupling spectrum of VLF of two signals was highest during stage 1/2 during sleep (p = 0.03). To our knowledge, this is the first study to describe the relationship between trapezius sEMG and EEG during sleep. These results of our study will help us to establish the norm data of trapezius sEMG change of healthy human during sleep. Further studies to compare the normal and TM subjects will be conducted for clinical application.
Subjects
Trapezius
surface electromyography
Sleep
electroencephalography
polysomnography
oscillation
SDGs
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