Changed activation, oxygenation, and pain response of chronically painful muscles to repetitive work after training interventions: a randomized controlled trial

Karen Søgaard, Anne Katrine Blangsted, Pernille Kofoed Nielsen, Lone Hansen, Lars L Andersen, Pernille Vedsted, Gisela Sjøgaard

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The aim of this randomized controlled trial was to assess changes in myalgic trapezius activation, muscle oxygenation, and pain intensity during repetitive and stressful work tasks in response to 10 weeks of training. In total, 39 women with a clinical diagnosis of trapezius myalgia were randomly assigned to: (1) general fitness training performed as leg-bicycling (GFT); (2) specific strength training of the neck/shoulder muscles (SST) or (3) reference intervention without physical exercise. Electromyographic activity (EMG), tissue oxygenation (near infrared spectroscopy), and pain intensity were measured in trapezius during pegboard and stress tasks before and after the intervention period. During the pegboard task, GFT improved trapezius oxygenation from a relative decrease of -0.83 ± 1.48 μM to an increase of 0.05 ± 1.32 μM, and decreased pain development by 43%, but did not affect resting levels of pain. SST lowered the relative EMG amplitude by 36%, and decreased pain during resting and working conditions by 52 and 38%, respectively, without affecting trapezius oxygenation. In conclusion, GFT performed as leg-bicycling decreased pain development during repetitive work tasks, possibly due to improved oxygenation of the painful muscles. SST lowered the overall level of pain both during rest and work, possibly due to a lowered relative exposure as evidenced by a lowered relative EMG. The results demonstrate differential adaptive mechanisms of contrasting physical exercise interventions on chronic muscle pain at rest and during repetitive work tasks.
Original languageEnglish
JournalEuropean Journal of Applied Physiology
Volume112
Issue number1
Pages (from-to)173-181
Number of pages9
ISSN1439-6319
DOIs
Publication statusPublished - 2012

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Superficial Back Muscles
Randomized Controlled Trials
Muscles
Myalgia
Leg
Exercise
Neck Muscles
Near-Infrared Spectroscopy
Resistance Training
Chronic Pain

Cite this

@article{186774e5e7e247a2af3bb19244fe0c74,
title = "Changed activation, oxygenation, and pain response of chronically painful muscles to repetitive work after training interventions: a randomized controlled trial",
abstract = "The aim of this randomized controlled trial was to assess changes in myalgic trapezius activation, muscle oxygenation, and pain intensity during repetitive and stressful work tasks in response to 10 weeks of training. In total, 39 women with a clinical diagnosis of trapezius myalgia were randomly assigned to: (1) general fitness training performed as leg-bicycling (GFT); (2) specific strength training of the neck/shoulder muscles (SST) or (3) reference intervention without physical exercise. Electromyographic activity (EMG), tissue oxygenation (near infrared spectroscopy), and pain intensity were measured in trapezius during pegboard and stress tasks before and after the intervention period. During the pegboard task, GFT improved trapezius oxygenation from a relative decrease of -0.83 ± 1.48 μM to an increase of 0.05 ± 1.32 μM, and decreased pain development by 43{\%}, but did not affect resting levels of pain. SST lowered the relative EMG amplitude by 36{\%}, and decreased pain during resting and working conditions by 52 and 38{\%}, respectively, without affecting trapezius oxygenation. In conclusion, GFT performed as leg-bicycling decreased pain development during repetitive work tasks, possibly due to improved oxygenation of the painful muscles. SST lowered the overall level of pain both during rest and work, possibly due to a lowered relative exposure as evidenced by a lowered relative EMG. The results demonstrate differential adaptive mechanisms of contrasting physical exercise interventions on chronic muscle pain at rest and during repetitive work tasks.",
author = "Karen S{\o}gaard and Blangsted, {Anne Katrine} and Nielsen, {Pernille Kofoed} and Lone Hansen and Andersen, {Lars L} and Pernille Vedsted and Gisela Sj{\o}gaard",
note = "Published online: 22 April 2011",
year = "2012",
doi = "10.1007/s00421-011-1964-6",
language = "English",
volume = "112",
pages = "173--181",
journal = "European Journal of Applied Physiology",
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Changed activation, oxygenation, and pain response of chronically painful muscles to repetitive work after training interventions: a randomized controlled trial. / Søgaard, Karen; Blangsted, Anne Katrine; Nielsen, Pernille Kofoed; Hansen, Lone; Andersen, Lars L; Vedsted, Pernille; Sjøgaard, Gisela.

In: European Journal of Applied Physiology, Vol. 112, No. 1, 2012, p. 173-181.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Changed activation, oxygenation, and pain response of chronically painful muscles to repetitive work after training interventions: a randomized controlled trial

AU - Søgaard, Karen

AU - Blangsted, Anne Katrine

AU - Nielsen, Pernille Kofoed

AU - Hansen, Lone

AU - Andersen, Lars L

AU - Vedsted, Pernille

AU - Sjøgaard, Gisela

N1 - Published online: 22 April 2011

PY - 2012

Y1 - 2012

N2 - The aim of this randomized controlled trial was to assess changes in myalgic trapezius activation, muscle oxygenation, and pain intensity during repetitive and stressful work tasks in response to 10 weeks of training. In total, 39 women with a clinical diagnosis of trapezius myalgia were randomly assigned to: (1) general fitness training performed as leg-bicycling (GFT); (2) specific strength training of the neck/shoulder muscles (SST) or (3) reference intervention without physical exercise. Electromyographic activity (EMG), tissue oxygenation (near infrared spectroscopy), and pain intensity were measured in trapezius during pegboard and stress tasks before and after the intervention period. During the pegboard task, GFT improved trapezius oxygenation from a relative decrease of -0.83 ± 1.48 μM to an increase of 0.05 ± 1.32 μM, and decreased pain development by 43%, but did not affect resting levels of pain. SST lowered the relative EMG amplitude by 36%, and decreased pain during resting and working conditions by 52 and 38%, respectively, without affecting trapezius oxygenation. In conclusion, GFT performed as leg-bicycling decreased pain development during repetitive work tasks, possibly due to improved oxygenation of the painful muscles. SST lowered the overall level of pain both during rest and work, possibly due to a lowered relative exposure as evidenced by a lowered relative EMG. The results demonstrate differential adaptive mechanisms of contrasting physical exercise interventions on chronic muscle pain at rest and during repetitive work tasks.

AB - The aim of this randomized controlled trial was to assess changes in myalgic trapezius activation, muscle oxygenation, and pain intensity during repetitive and stressful work tasks in response to 10 weeks of training. In total, 39 women with a clinical diagnosis of trapezius myalgia were randomly assigned to: (1) general fitness training performed as leg-bicycling (GFT); (2) specific strength training of the neck/shoulder muscles (SST) or (3) reference intervention without physical exercise. Electromyographic activity (EMG), tissue oxygenation (near infrared spectroscopy), and pain intensity were measured in trapezius during pegboard and stress tasks before and after the intervention period. During the pegboard task, GFT improved trapezius oxygenation from a relative decrease of -0.83 ± 1.48 μM to an increase of 0.05 ± 1.32 μM, and decreased pain development by 43%, but did not affect resting levels of pain. SST lowered the relative EMG amplitude by 36%, and decreased pain during resting and working conditions by 52 and 38%, respectively, without affecting trapezius oxygenation. In conclusion, GFT performed as leg-bicycling decreased pain development during repetitive work tasks, possibly due to improved oxygenation of the painful muscles. SST lowered the overall level of pain both during rest and work, possibly due to a lowered relative exposure as evidenced by a lowered relative EMG. The results demonstrate differential adaptive mechanisms of contrasting physical exercise interventions on chronic muscle pain at rest and during repetitive work tasks.

U2 - 10.1007/s00421-011-1964-6

DO - 10.1007/s00421-011-1964-6

M3 - Journal article

C2 - 21512799

VL - 112

SP - 173

EP - 181

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

SN - 1439-6319

IS - 1

ER -