Between-muscle differences in the adaptation to experimental pain

Hug, François, Hodges, Paul W., Van Den Hoorn, Wolbert and Tucker, Kylie (2014) Between-muscle differences in the adaptation to experimental pain. Journal of Applied Physiology, 117 10: 1132-1140. doi:10.1152/japplphysiol.00561.2014

Author Hug, François
Hodges, Paul W.
Van Den Hoorn, Wolbert
Tucker, Kylie
Title Between-muscle differences in the adaptation to experimental pain
Journal name Journal of Applied Physiology   Check publisher's open access policy
ISSN 1522-1601
Publication date 2014-11-15
Year available 2014
Sub-type Article (original research)
DOI 10.1152/japplphysiol.00561.2014
Open Access Status DOI
Volume 117
Issue 10
Start page 1132
End page 1140
Total pages 9
Place of publication Bethesda, MD,United States
Publisher American Physiological Society
Collection year 2015
Language eng
Formatted abstract
This study aimed to determine whether muscle stress (force per unit area) can be redistributed between individual heads of the quadriceps muscle when pain is induced into one of these heads. Elastography was used to measure muscle shear elastic modulus (an index of muscle stress). Electromyography (EMG) was recorded from vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF). In experiment I (n = 20), participants matched a knee extension force, and thus any reduction of stress within the painful muscle would require compensation by other muscles. In experiment II (n = 13), participants matched VL EMG amplitude and were free to vary external force such that intermuscle compensation would be unnecessary to maintain the experimental task. In experiments I and II, pain was induced by injection of hypertonic saline into VM or RF. Experiment III aimed to establish whether voluntary drive to the individual muscles could be controlled independently. Participants (n = 13) were asked to voluntarily reduce activation of VM or RF while maintaining knee extension force. During VM pain, there was no change in shear elastic modulus (experiments I and II) or EMG amplitude of VM (experiment II). In contrast, RF pain was associated with a reduction in RF elastic modulus (experiments I and II: −8 to −17%) and EMG amplitude (experiment II). Participants could voluntarily reduce EMG amplitude of RF (−26%; P = 0.003) but not VM (experiment III). These results highlight between-muscle differences in adaptation to pain that might be explained by their function (monoarticular vs. biarticular) and/or the neurophysiological constraints associated to their activation.
Keyword Quadriceps
Noxious stimulation
Supersonic shear imaging
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biomedical Sciences Publications
School of Health and Rehabilitation Sciences Publications
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