The Location of Peak Upper Trapezius Muscle Activity During Submaximal Contractions is not Associated With the Location of Myofascial Trigger Points: New Insights Revealed by High-density Surface EMG: New Insights Revealed by High-density Surface EMG

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@article{6893b62413a748e9b6a015f3b55bf4cb,
title = "The Location of Peak Upper Trapezius Muscle Activity During Submaximal Contractions is not Associated With the Location of Myofascial Trigger Points: New Insights Revealed by High-density Surface EMG: New Insights Revealed by High-density Surface EMG",
abstract = "AIM: To apply topographical mapping of the electromyography (EMG) amplitude recorded from the upper trapezius muscle to evaluate the distribution of activity and the location of peak activity during a shoulder elevation task in participants with and without myofascial pain and trigger points (MTrP) and compare this location with the site of the MTrP.MATERIALS AND METHODS: Thirteen participants with myofascial pain and MTrP in the upper trapezius muscle and 12 asymptomatic participants participated. High-density surface EMG was recorded from the upper trapezius muscle using a matrix of 64 surface electrodes aligned with an anatomic landmark system (ALS). Each participant performed a shoulder elevation task consisting of a series of 30▒s ramped contractions to 15% or 60% of their maximal voluntary contraction (MVC) force. Topographical maps of the EMG average rectified value were computed and the peak EMG amplitude during the ramped contractions was identified and its location determined with respect to the ALS. The location of the MTrP was also determined relative to the ALS and Spearman correlation coefficients were used to examine the relationship between MTrP and peak EMG amplitude location.RESULTS: The location of the peak EMG amplitude was significantly (P<0.05) different between groups (participants with pain/MTrP: -0.32±1.2▒cm at 15% MVC and -0.35±0.9▒cm at 60% MVC relative to the ALS; asymptomatic participants: 1.0±1.3▒cm at 15% MVC and 1.3±1.1▒cm relative to the ALS). However, no correlation was observed between the position of the MTrP and peak EMG amplitude during the ramped contractions at either force level (15%: rs=0.039, P=0.9; 60%: rs=-0.087, P=0.778).CONCLUSIONS: People with myofascial pain and MTrP displayed a caudal shift of the distribution of upper trapezius muscle activity compared with asymptomatic individuals during a submaximal shoulder elevation task. However, for the first time, we show that the location of peak muscle activity is not associated with the location of MTrP.",
keywords = "myofascial trigger points, high-density surface electromyography, topographical maps, upper trapezius muscle, ramped isometric contractions",
author = "Marco Barbero and Deborah Falla and L Mafodda and Corrado Cescon and Roberto Gatti",
year = "2016",
month = apr,
day = "22",
doi = "10.1097/AJP.0000000000000373",
language = "English",
journal = "Clinical Journal of Pain",
issn = "0749-8047",
publisher = "Lippincott Williams and Wilkins",

}

RIS

TY - JOUR

T1 - The Location of Peak Upper Trapezius Muscle Activity During Submaximal Contractions is not Associated With the Location of Myofascial Trigger Points: New Insights Revealed by High-density Surface EMG

T2 - New Insights Revealed by High-density Surface EMG

AU - Barbero, Marco

AU - Falla, Deborah

AU - Mafodda , L

AU - Cescon, Corrado

AU - Gatti, Roberto

PY - 2016/4/22

Y1 - 2016/4/22

N2 - AIM: To apply topographical mapping of the electromyography (EMG) amplitude recorded from the upper trapezius muscle to evaluate the distribution of activity and the location of peak activity during a shoulder elevation task in participants with and without myofascial pain and trigger points (MTrP) and compare this location with the site of the MTrP.MATERIALS AND METHODS: Thirteen participants with myofascial pain and MTrP in the upper trapezius muscle and 12 asymptomatic participants participated. High-density surface EMG was recorded from the upper trapezius muscle using a matrix of 64 surface electrodes aligned with an anatomic landmark system (ALS). Each participant performed a shoulder elevation task consisting of a series of 30▒s ramped contractions to 15% or 60% of their maximal voluntary contraction (MVC) force. Topographical maps of the EMG average rectified value were computed and the peak EMG amplitude during the ramped contractions was identified and its location determined with respect to the ALS. The location of the MTrP was also determined relative to the ALS and Spearman correlation coefficients were used to examine the relationship between MTrP and peak EMG amplitude location.RESULTS: The location of the peak EMG amplitude was significantly (P<0.05) different between groups (participants with pain/MTrP: -0.32±1.2▒cm at 15% MVC and -0.35±0.9▒cm at 60% MVC relative to the ALS; asymptomatic participants: 1.0±1.3▒cm at 15% MVC and 1.3±1.1▒cm relative to the ALS). However, no correlation was observed between the position of the MTrP and peak EMG amplitude during the ramped contractions at either force level (15%: rs=0.039, P=0.9; 60%: rs=-0.087, P=0.778).CONCLUSIONS: People with myofascial pain and MTrP displayed a caudal shift of the distribution of upper trapezius muscle activity compared with asymptomatic individuals during a submaximal shoulder elevation task. However, for the first time, we show that the location of peak muscle activity is not associated with the location of MTrP.

AB - AIM: To apply topographical mapping of the electromyography (EMG) amplitude recorded from the upper trapezius muscle to evaluate the distribution of activity and the location of peak activity during a shoulder elevation task in participants with and without myofascial pain and trigger points (MTrP) and compare this location with the site of the MTrP.MATERIALS AND METHODS: Thirteen participants with myofascial pain and MTrP in the upper trapezius muscle and 12 asymptomatic participants participated. High-density surface EMG was recorded from the upper trapezius muscle using a matrix of 64 surface electrodes aligned with an anatomic landmark system (ALS). Each participant performed a shoulder elevation task consisting of a series of 30▒s ramped contractions to 15% or 60% of their maximal voluntary contraction (MVC) force. Topographical maps of the EMG average rectified value were computed and the peak EMG amplitude during the ramped contractions was identified and its location determined with respect to the ALS. The location of the MTrP was also determined relative to the ALS and Spearman correlation coefficients were used to examine the relationship between MTrP and peak EMG amplitude location.RESULTS: The location of the peak EMG amplitude was significantly (P<0.05) different between groups (participants with pain/MTrP: -0.32±1.2▒cm at 15% MVC and -0.35±0.9▒cm at 60% MVC relative to the ALS; asymptomatic participants: 1.0±1.3▒cm at 15% MVC and 1.3±1.1▒cm relative to the ALS). However, no correlation was observed between the position of the MTrP and peak EMG amplitude during the ramped contractions at either force level (15%: rs=0.039, P=0.9; 60%: rs=-0.087, P=0.778).CONCLUSIONS: People with myofascial pain and MTrP displayed a caudal shift of the distribution of upper trapezius muscle activity compared with asymptomatic individuals during a submaximal shoulder elevation task. However, for the first time, we show that the location of peak muscle activity is not associated with the location of MTrP.

KW - myofascial trigger points

KW - high-density surface electromyography

KW - topographical maps

KW - upper trapezius muscle

KW - ramped isometric contractions

U2 - 10.1097/AJP.0000000000000373

DO - 10.1097/AJP.0000000000000373

M3 - Article

C2 - 27110746

JO - Clinical Journal of Pain

JF - Clinical Journal of Pain

SN - 0749-8047

ER -