Effect of contrasting physical exercise interventions on rapid force capacity of chronically painful muscles

Lars L Andersen, Jesper L Andersen, Charlotte Suetta, Michael Kjaer, Karen Søgaard, Gisela Sjøgaard

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Rapid force capacity of chronically painful muscles is inhibited markedly more than maximal force capacity and is therefore relevant to assess in rehabilitation settings. Our objective was to investigate the effect of two contrasting types of physical exercise on rapid force capacity, as well as neural and muscular adaptations in women with chronic neck muscle pain. A group of employed women (n = 42) with a clinical diagnosis of trapezius myalgia participated in a 10-wk randomized controlled trial; specific strength training of the neck/shoulder muscles, general fitness training performed as leg-bicycling; or a reference intervention without physical activity. Maximal voluntary shoulder abductions were performed at static angles of 35 degrees and 115 degrees with simultaneous recording of electromyography (EMG) in the trapezius and deltoid. Maximal muscle strength and activation (peak torque and peak EMG) as well as rapid muscle strength and activation [rate of torque development (RTD) and rate of EMG rise] were subsequently determined. Trapezius muscle fiber characteristics were determined with ATPase histochemistry. Significant changes were observed only in the specific strength training group. Whereas peak torque increased 18-29% (P < 0.01), RTD increased 61-115% (P < 0.001). Peak EMG and rate of EMG rise increased correspondingly (P < 0.05-0.001), and trapezius type II muscle fibers hypertrophied 20% (P < 0.001). In conclusion, rapid force capacity of chronically painful muscles is highly responsive to rehabilitation with specific strength training. The underlying mechanisms were related to both pain reduction and general neuromuscular adaptations to strength training. Potentially, the present method can be a useful clinical screening tool of muscle function in rehabilitation settings.
Original languageEnglish
JournalJournal of Applied Physiology
Volume107
Issue number5
Pages (from-to)1413-9
Number of pages6
ISSN8750-7587
DOIs
Publication statusPublished - 1. Nov 2009

Fingerprint

Electromyography
Superficial Back Muscles
Resistance Training
Torque
Exercise
Muscles
Neck Muscles
Myalgia
Fast-Twitch Muscle Fibers
Neck Pain
Chronic Pain
Adenosine Triphosphatases
Leg
Randomized Controlled Trials

Cite this

Andersen, Lars L ; Andersen, Jesper L ; Suetta, Charlotte ; Kjaer, Michael ; Søgaard, Karen ; Sjøgaard, Gisela. / Effect of contrasting physical exercise interventions on rapid force capacity of chronically painful muscles. In: Journal of Applied Physiology. 2009 ; Vol. 107, No. 5. pp. 1413-9.
@article{bae47470d42b11deb0fe000ea68e967b,
title = "Effect of contrasting physical exercise interventions on rapid force capacity of chronically painful muscles",
abstract = "Rapid force capacity of chronically painful muscles is inhibited markedly more than maximal force capacity and is therefore relevant to assess in rehabilitation settings. Our objective was to investigate the effect of two contrasting types of physical exercise on rapid force capacity, as well as neural and muscular adaptations in women with chronic neck muscle pain. A group of employed women (n = 42) with a clinical diagnosis of trapezius myalgia participated in a 10-wk randomized controlled trial; specific strength training of the neck/shoulder muscles, general fitness training performed as leg-bicycling; or a reference intervention without physical activity. Maximal voluntary shoulder abductions were performed at static angles of 35 degrees and 115 degrees with simultaneous recording of electromyography (EMG) in the trapezius and deltoid. Maximal muscle strength and activation (peak torque and peak EMG) as well as rapid muscle strength and activation [rate of torque development (RTD) and rate of EMG rise] were subsequently determined. Trapezius muscle fiber characteristics were determined with ATPase histochemistry. Significant changes were observed only in the specific strength training group. Whereas peak torque increased 18-29{\%} (P < 0.01), RTD increased 61-115{\%} (P < 0.001). Peak EMG and rate of EMG rise increased correspondingly (P < 0.05-0.001), and trapezius type II muscle fibers hypertrophied 20{\%} (P < 0.001). In conclusion, rapid force capacity of chronically painful muscles is highly responsive to rehabilitation with specific strength training. The underlying mechanisms were related to both pain reduction and general neuromuscular adaptations to strength training. Potentially, the present method can be a useful clinical screening tool of muscle function in rehabilitation settings.",
author = "Andersen, {Lars L} and Andersen, {Jesper L} and Charlotte Suetta and Michael Kjaer and Karen S{\o}gaard and Gisela Sj{\o}gaard",
year = "2009",
month = "11",
day = "1",
doi = "10.1152/japplphysiol.00555.2009",
language = "English",
volume = "107",
pages = "1413--9",
journal = "Journal of Applied Physiology",
issn = "8750-7587",
publisher = "American Physiological Society",
number = "5",

}

Effect of contrasting physical exercise interventions on rapid force capacity of chronically painful muscles. / Andersen, Lars L; Andersen, Jesper L; Suetta, Charlotte; Kjaer, Michael; Søgaard, Karen; Sjøgaard, Gisela.

In: Journal of Applied Physiology, Vol. 107, No. 5, 01.11.2009, p. 1413-9.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effect of contrasting physical exercise interventions on rapid force capacity of chronically painful muscles

AU - Andersen, Lars L

AU - Andersen, Jesper L

AU - Suetta, Charlotte

AU - Kjaer, Michael

AU - Søgaard, Karen

AU - Sjøgaard, Gisela

PY - 2009/11/1

Y1 - 2009/11/1

N2 - Rapid force capacity of chronically painful muscles is inhibited markedly more than maximal force capacity and is therefore relevant to assess in rehabilitation settings. Our objective was to investigate the effect of two contrasting types of physical exercise on rapid force capacity, as well as neural and muscular adaptations in women with chronic neck muscle pain. A group of employed women (n = 42) with a clinical diagnosis of trapezius myalgia participated in a 10-wk randomized controlled trial; specific strength training of the neck/shoulder muscles, general fitness training performed as leg-bicycling; or a reference intervention without physical activity. Maximal voluntary shoulder abductions were performed at static angles of 35 degrees and 115 degrees with simultaneous recording of electromyography (EMG) in the trapezius and deltoid. Maximal muscle strength and activation (peak torque and peak EMG) as well as rapid muscle strength and activation [rate of torque development (RTD) and rate of EMG rise] were subsequently determined. Trapezius muscle fiber characteristics were determined with ATPase histochemistry. Significant changes were observed only in the specific strength training group. Whereas peak torque increased 18-29% (P < 0.01), RTD increased 61-115% (P < 0.001). Peak EMG and rate of EMG rise increased correspondingly (P < 0.05-0.001), and trapezius type II muscle fibers hypertrophied 20% (P < 0.001). In conclusion, rapid force capacity of chronically painful muscles is highly responsive to rehabilitation with specific strength training. The underlying mechanisms were related to both pain reduction and general neuromuscular adaptations to strength training. Potentially, the present method can be a useful clinical screening tool of muscle function in rehabilitation settings.

AB - Rapid force capacity of chronically painful muscles is inhibited markedly more than maximal force capacity and is therefore relevant to assess in rehabilitation settings. Our objective was to investigate the effect of two contrasting types of physical exercise on rapid force capacity, as well as neural and muscular adaptations in women with chronic neck muscle pain. A group of employed women (n = 42) with a clinical diagnosis of trapezius myalgia participated in a 10-wk randomized controlled trial; specific strength training of the neck/shoulder muscles, general fitness training performed as leg-bicycling; or a reference intervention without physical activity. Maximal voluntary shoulder abductions were performed at static angles of 35 degrees and 115 degrees with simultaneous recording of electromyography (EMG) in the trapezius and deltoid. Maximal muscle strength and activation (peak torque and peak EMG) as well as rapid muscle strength and activation [rate of torque development (RTD) and rate of EMG rise] were subsequently determined. Trapezius muscle fiber characteristics were determined with ATPase histochemistry. Significant changes were observed only in the specific strength training group. Whereas peak torque increased 18-29% (P < 0.01), RTD increased 61-115% (P < 0.001). Peak EMG and rate of EMG rise increased correspondingly (P < 0.05-0.001), and trapezius type II muscle fibers hypertrophied 20% (P < 0.001). In conclusion, rapid force capacity of chronically painful muscles is highly responsive to rehabilitation with specific strength training. The underlying mechanisms were related to both pain reduction and general neuromuscular adaptations to strength training. Potentially, the present method can be a useful clinical screening tool of muscle function in rehabilitation settings.

U2 - 10.1152/japplphysiol.00555.2009

DO - 10.1152/japplphysiol.00555.2009

M3 - Journal article

VL - 107

SP - 1413

EP - 1419

JO - Journal of Applied Physiology

JF - Journal of Applied Physiology

SN - 8750-7587

IS - 5

ER -