Wavelet transformed in the analysis of LED therapy effect on the activity of masseter muscles in women with temporomandibular disorder
DOI:
https://doi.org/10.15448/1980-6108.2018.2.29045Keywords:
temporomandibular joint dysfunction syndrome, low-level light therapy, light emitting diode, electromyography.Abstract
AIMS: To present the wavelet transform as an alternative tool in the evaluation of the masseter muscle electrical activity in women with temporomandibular disorder after therapy with Light Emitting Diode (LED).
METHODS: Five volunteers with temporomandibular disorder underwent four sessions of LED therapy. Electromyography of the masseter muscle was performed bilaterally before and after treatment. For analysing the electromyographic signals, the wavelet transform was applied in the Morlet function.
RESULTS: In the scalogram, a decrease in the activation of the high-frequency fibers in the rest protocol and its increase in the isometric movement protocol were observed. In the analysis based on the RGB color system, we observed that in the right masseter muscle resting protocol, the moments of maximum energy intensities were reduced by 82% for frequencies of 256-512 Hz and by 42% for frequencies above 512 Hz. In the left masseter muscle the reduction was 42% in the frequency band of 256-512 Hz.
CONCLUSIONS: Analysis by the wavelet transform allowed identification of physiological factors related not only to the activation of the masseter muscle, but also to the intensity and time / frequency relationship, as well as the main types of fibers activated during the protocols before and after LED therapy in patients with dysfunction temporomandibular.
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