Surface Electromyographic Activity of the Upper Trapezius Before and After a Single Dry Needling Session in Female Office Workers With Trapezius Myalgia

Abstract Introduction The rapid maxillary expansion (RME) reduces the risk of developing structural and functional disorders in the stomatognathic system. Objective To examine the effects of the RME as a treatment for the posterior crossbite, related with the electromyographic activity of the masticatory muscles and the TMJ noises in a population of children. Material and method 13 girls and 7 boys, regardless of the type of malocclusion, with a mean age of 9 years old (± 3), were treated with RME. The electrovibratography analyzed the TMJ noise, and the electromyography analyzed the masticatory muscles before treatment (T0) and after three months of a short-term follow-up (T1). The comparisons of the affected and unaffected sides by the crossbite were performed using Mann-Whitney’s test, and to compare data before and after treatment the Wilcoxon’s test was used (level of significance: 5%). Result No significant differences were found in the parameters of joint noise in comparison to the sides affected and unaffected by the crossbite, in both T0 and T1 (p>0.05); only the side without the crossbite observed decrease in the peak amplitude of the joint noises after treatment. In the static electromyographic analysis, inter-side differences were observed before and after treatment, since the deliberate unilateral chewing showed greater asymmetry activity in T0 for both sides, which has been corrected after treatment, improving the functional chewing. Conclusion The proposed treatment did not lead to the occurrence of joint noises and improved the functional pattern of electromyographic activity during chewing at the end of treatment.

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Muscle Activity Before and After Subacromial Injection

Journal of Sport Rehabilitation ◽

10.1123/jsr.2020-0524 ◽

2021 ◽

pp. 1-7

Author(s):

Lucas Ettinger ◽

Matthew Shaprio ◽

Andrew Karduna

Keyword(s):

Rotator Cuff ◽

Muscle Activation ◽

Rotator Cuff Tears ◽

Subacromial Impingement ◽

Upper Trapezius ◽

Subacromial Injection ◽

Shoulder Muscle ◽

Shoulder Muscles ◽

Before And After ◽

Arm Elevation

Context: Shoulder muscle activation in patients with subacromial impingement is highly cited and variable in the literature. Differences between studies could be due to artifacts introduced by normalization practices in the presence of pain. Ultimately, this lack of knowledge pertaining to pathogenesis limits the clinical treatment and restoration of muscular function. Design: A total of 21 patients with stage 2 subacromial impingement and 21 matched controls were recruited for EMG testing of their affected shoulder during an arm elevation task. The patients were tested before and after receiving an injection to their subacromial bursa. Methods: The EMG from 7 shoulder muscles were measured before and after treatment during humeral motion in the scapular plane. Results: Our findings indicate an increase in anterior deltoid, middle deltoid, and upper trapezius activity following the injection; further, this trend extended to the controls. The control subjects had a greater activation of the latissimus dorsi at peak arm elevation when compared with the patient group postinjection. Conclusions: Our results indicate that a reduction in subacromial pain is associated with changes in shoulder muscle recruitment, primarily of the deltoid. This change in deltoid activity may lend evidence to rotator cuff function in patients without rotator cuff tears.

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Forte Fortissimo for Amateur Musicians: No Effect on Otoacoustic Emissions

Medical Problems of Performing Artists ◽

10.21091/mppa.2013.1002 ◽

2013 ◽

Vol 28 (1) ◽

pp. 3-8 ◽

Cited By ~ 1

Author(s):

Ole J Møllerløkken ◽

Nils Magerøy ◽

Magne Bråtveit ◽

Ola Lind ◽

Bente E Moen

Keyword(s):

Otoacoustic Emissions ◽

Office Workers ◽

Cochlear Function ◽

Distortion Product ◽

Brass Band ◽

Hearing Ability ◽

Sound Levels ◽

Amateur Musicians ◽

Before And After ◽

Noise Measurements

Many amateur musicians are likely to be exposed to high sound levels during rehearsals. Measuring otoacoustic emissions (OAE) is an objective technique to assess hearing ability and can be used as an early predictor of hearing loss. This study aimed to record sound levels at an amateur brass band rehearsal and to examine the cochlear function of the musicians by evaluating distortion product (DP) OAE amplitudes before and after sound exposure. Twenty-four brass band musicians and 10 office workers were examined with personal noise measurements and DPOAE tests before and after a music rehearsal or one office workday, respectively. The sound levels in the brass band ranged from 92 to 100 dB(A), LaEQ 96 dB(A). However, the amateur brass band members had no change in DPOAEs after this exposure compared to pre-exposure levels and compared to office workers.

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Acute Effect of the Compression Technique on the Electromyographic Activity of the Masticatory Muscles and Mouth Opening in Subjects with Active Myofascial Trigger Points

Applied Sciences ◽

10.3390/app10217750 ◽

2020 ◽

Vol 10 (21) ◽

pp. 7750 ◽

Cited By ~ 1

Author(s):

Michał Ginszt ◽

Grzegorz Zieliński ◽

Marcin Berger ◽

Jacek Szkutnik ◽

Magdalena Bakalczuk ◽

...

Keyword(s):

Mouth Opening ◽

Trigger Points ◽

Acute Effect ◽

Masticatory Muscles ◽

Study Group ◽

Electromyographic Activity ◽

Compression Technique ◽

Myofascial Trigger Points ◽

Stomatognathic System ◽

Before And After

Active myofascial trigger points (MTrPs) in masticatory muscles are associated with a reduced range of motion and muscle weakness within the stomatognathic system. However, it is hard to identify the most effective treatment technique for disorders associated with MTrPs. The objective of this study was to analyze the acute effect of the compression technique (CT) on active maximal mouth opening (MMO) and electromyographic activity of the masseter (MM) and temporalis anterior (TA) muscles in subjects with active myofascial trigger points in the MM muscles. The study group comprised 26 women (mean age 22 ± 2) with bilateral active myofascial trigger points (MTrPs) in the MM. The control group comprised 26 healthy women (mean age 22 ± 1) without the presence of MTrPs in the MM. Masticatory muscle activity was recorded in two conditions (during resting mandibular position and maximum voluntary clenching) before and after the application of the CT to the MTrPs in MM. After the CT application, a significant decrease in resting activity (3.09 μV vs. 2.37 μV, p = 0.006) and a significant increase in clenching activity (110.20 μV vs. 139.06 μV, p = 0.014) within the MM muscles were observed in the study group, which was not observed within TA muscles. Controls showed significantly higher active MMO values compared to the study group before CT (50.42 mm vs. 46.31 mm, p = 0.024). The differences between the study group after CT and controls, as well as among the study group before and after CT did not reach the assumed level of significance in terms of active MMO. The compression technique appears to be effective in the improvement of the active maximal mouth opening and gives significant acute effects on bioelectric masticatory muscle activity. Therefore, CT seems to be effective in MTrPs rehabilitation within the stomatognathic system.

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