Insight into motor adaptation to pain from between-leg compensation

Hug, Francois, Hodges, Paul W., Salomoni, Sauro E. and Tucker, Kylie (2014) Insight into motor adaptation to pain from between-leg compensation. European Journal of Applied Physiology, 114 5: 1057-1065. doi:10.1007/s00421-014-2840-y

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Author Hug, Francois
Hodges, Paul W.
Salomoni, Sauro E.
Tucker, Kylie
Title Insight into motor adaptation to pain from between-leg compensation
Journal name European Journal of Applied Physiology   Check publisher's open access policy
ISSN 1439-6319
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s00421-014-2840-y
Open Access Status File (Author Post-print)
Volume 114
Issue 5
Start page 1057
End page 1065
Total pages 9
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Subject 2739 Public Health, Environmental and Occupational Health
2737 Physiology (medical)
2732 Orthopedics and Sports Medicine
Abstract Purpose: Although it appears obvious that we change movement behaviors to unload the painful region, non-systematic motor adaptations observed in simple experimental tasks with pain question this theory. We investigated the effect of unilateral pain on performance of a bilateral plantarflexion task. This experimental task clearly allowed for stress on painful tissue to be reduced by modification of load sharing between legs. Methods: Fourteen participants performed a bilateral plantarflexion at 10, 30, 50 and 70 % of their MVC during 5 conditions (Baseline, Saline-1, Washout-1, Saline-2, Washout-2). For Saline-1 and -2, either isotonic saline (Iso) or hypertonic saline (Pain) was injected into the left soleus. Results: The force produced by the painful leg was less during Pain than Baseline (range -52.6 % at 10 % of MVC to -20.1 % at 70 % of MVC; P < 0.003). This was compensated by more force produced by the non-painful leg (range 18.4 % at 70 % of MVC to 70.2 % at 10 % of MVC; P < 0.001). The reduction in plantarflexion force was not accompanied by a significant decrease in soleus electromyographic activity at 10 and 30 % of MVC. Further, no significant linear relationship was found between changes in soleus electromyographic activity and change in plantarflexion force for the painful leg (with the exception of a weak relationship at 10 % of MVC, i.e., R2 = 0.31). Conclusion: These results show that when the nervous system is presented with an obvious solution to decrease stress on irritated tissue, this option is selected. However, this was not strongly related to a decrease in soleus (painful muscle) activity level.
Keyword Electromyography
Force plate
Hypertonic saline
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID ID401599
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
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