Voluntary activation of the trapezius muscle in cases with neck/shoulder pain compared to healthy controls

Katrine Tholstrup Bech, Camilla Marie Larsen, Gisela Sjøgaard, Andreas Holtermann, Janet Louise Taylor, Karen Søgaard

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Subjects reporting neck/shoulder pain have been shown to generate less force during maximal voluntary isometric contractions (MVC) of the shoulder muscles compared to healthy controls. This has been suggested to be caused by a pain-related decrease in voluntary activation (VA) rather than lack of muscle mass. The aim of the present study was to investigate VA of the trapezius muscle during MVCs in subjects with and without neck/shoulder pain by use of the twitch interpolation technique. Ten cases suffering from pain and ten age and gender matched, healthy controls were included in the study. Upper trapezius muscle thickness was measured using ultrasonography and pain intensity was measured on a 100mm visual analog scale (VAS). VA was calculated from five maximal muscle activation attempts. Superimposed stimuli were delivered to the accessory nerve at peak force and during a 2% MVC following the maximal contraction. Presented as mean±SD for cases and controls, respectively: VAS; 16.0±14.4mm and 2.1±4.1mm (P=0.004), MVC; 545±161N and 664±195N (P=0.016), upper trapezius muscle thickness; 10.9±1.9mm and 10.4±1.5mm (P=0.20), VA; 93.6±14.2% and 96.3±6.0% (P=0.29). In spite of significantly eight-fold higher pain intensity and ∼20% lower MVC for cases compared to controls, no difference was found in VA. Possible explanations for the reduction in MVC could be differences in co-activation of antagonists and synergists as well as muscle quality.

Original languageEnglish
JournalJournal of Electromyography & Kinesiology
Volume36
Pages (from-to)56-64
ISSN1050-6411
DOIs
Publication statusPublished - Oct 2017

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Shoulder Pain
Isometric Contraction
Superficial Back Muscles
Neck Pain
Muscles
Visual Analog Scale
Accessory Nerve
Ultrasonography

Keywords

  • Journal Article

Cite this

@article{8114da04be1c4adf852a2e264a649963,
title = "Voluntary activation of the trapezius muscle in cases with neck/shoulder pain compared to healthy controls",
abstract = "Subjects reporting neck/shoulder pain have been shown to generate less force during maximal voluntary isometric contractions (MVC) of the shoulder muscles compared to healthy controls. This has been suggested to be caused by a pain-related decrease in voluntary activation (VA) rather than lack of muscle mass. The aim of the present study was to investigate VA of the trapezius muscle during MVCs in subjects with and without neck/shoulder pain by use of the twitch interpolation technique. Ten cases suffering from pain and ten age and gender matched, healthy controls were included in the study. Upper trapezius muscle thickness was measured using ultrasonography and pain intensity was measured on a 100mm visual analog scale (VAS). VA was calculated from five maximal muscle activation attempts. Superimposed stimuli were delivered to the accessory nerve at peak force and during a 2{\%} MVC following the maximal contraction. Presented as mean±SD for cases and controls, respectively: VAS; 16.0±14.4mm and 2.1±4.1mm (P=0.004), MVC; 545±161N and 664±195N (P=0.016), upper trapezius muscle thickness; 10.9±1.9mm and 10.4±1.5mm (P=0.20), VA; 93.6±14.2{\%} and 96.3±6.0{\%} (P=0.29). In spite of significantly eight-fold higher pain intensity and ∼20{\%} lower MVC for cases compared to controls, no difference was found in VA. Possible explanations for the reduction in MVC could be differences in co-activation of antagonists and synergists as well as muscle quality.",
keywords = "Journal Article",
author = "Bech, {Katrine Tholstrup} and Larsen, {Camilla Marie} and Gisela Sj{\o}gaard and Andreas Holtermann and Taylor, {Janet Louise} and Karen S{\o}gaard",
note = "Copyright {\circledC} 2017 Elsevier Ltd. All rights reserved.",
year = "2017",
month = "10",
doi = "10.1016/j.jelekin.2017.07.006",
language = "English",
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pages = "56--64",
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Voluntary activation of the trapezius muscle in cases with neck/shoulder pain compared to healthy controls. / Bech, Katrine Tholstrup; Larsen, Camilla Marie; Sjøgaard, Gisela; Holtermann, Andreas; Taylor, Janet Louise; Søgaard, Karen.

In: Journal of Electromyography & Kinesiology, Vol. 36, 10.2017, p. 56-64.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Voluntary activation of the trapezius muscle in cases with neck/shoulder pain compared to healthy controls

AU - Bech, Katrine Tholstrup

AU - Larsen, Camilla Marie

AU - Sjøgaard, Gisela

AU - Holtermann, Andreas

AU - Taylor, Janet Louise

AU - Søgaard, Karen

N1 - Copyright © 2017 Elsevier Ltd. All rights reserved.

PY - 2017/10

Y1 - 2017/10

N2 - Subjects reporting neck/shoulder pain have been shown to generate less force during maximal voluntary isometric contractions (MVC) of the shoulder muscles compared to healthy controls. This has been suggested to be caused by a pain-related decrease in voluntary activation (VA) rather than lack of muscle mass. The aim of the present study was to investigate VA of the trapezius muscle during MVCs in subjects with and without neck/shoulder pain by use of the twitch interpolation technique. Ten cases suffering from pain and ten age and gender matched, healthy controls were included in the study. Upper trapezius muscle thickness was measured using ultrasonography and pain intensity was measured on a 100mm visual analog scale (VAS). VA was calculated from five maximal muscle activation attempts. Superimposed stimuli were delivered to the accessory nerve at peak force and during a 2% MVC following the maximal contraction. Presented as mean±SD for cases and controls, respectively: VAS; 16.0±14.4mm and 2.1±4.1mm (P=0.004), MVC; 545±161N and 664±195N (P=0.016), upper trapezius muscle thickness; 10.9±1.9mm and 10.4±1.5mm (P=0.20), VA; 93.6±14.2% and 96.3±6.0% (P=0.29). In spite of significantly eight-fold higher pain intensity and ∼20% lower MVC for cases compared to controls, no difference was found in VA. Possible explanations for the reduction in MVC could be differences in co-activation of antagonists and synergists as well as muscle quality.

AB - Subjects reporting neck/shoulder pain have been shown to generate less force during maximal voluntary isometric contractions (MVC) of the shoulder muscles compared to healthy controls. This has been suggested to be caused by a pain-related decrease in voluntary activation (VA) rather than lack of muscle mass. The aim of the present study was to investigate VA of the trapezius muscle during MVCs in subjects with and without neck/shoulder pain by use of the twitch interpolation technique. Ten cases suffering from pain and ten age and gender matched, healthy controls were included in the study. Upper trapezius muscle thickness was measured using ultrasonography and pain intensity was measured on a 100mm visual analog scale (VAS). VA was calculated from five maximal muscle activation attempts. Superimposed stimuli were delivered to the accessory nerve at peak force and during a 2% MVC following the maximal contraction. Presented as mean±SD for cases and controls, respectively: VAS; 16.0±14.4mm and 2.1±4.1mm (P=0.004), MVC; 545±161N and 664±195N (P=0.016), upper trapezius muscle thickness; 10.9±1.9mm and 10.4±1.5mm (P=0.20), VA; 93.6±14.2% and 96.3±6.0% (P=0.29). In spite of significantly eight-fold higher pain intensity and ∼20% lower MVC for cases compared to controls, no difference was found in VA. Possible explanations for the reduction in MVC could be differences in co-activation of antagonists and synergists as well as muscle quality.

KW - Journal Article

U2 - 10.1016/j.jelekin.2017.07.006

DO - 10.1016/j.jelekin.2017.07.006

M3 - Journal article

C2 - 28735103

VL - 36

SP - 56

EP - 64

JO - Journal of Electromyography & Kinesiology

JF - Journal of Electromyography & Kinesiology

SN - 1050-6411

ER -