NDLI: Motor adaptations to local muscle pain during a bilateral cyclic task

Content Provider	Springer Nature Link
Author	Brøchner Nielsen, Niels Peter Tucker, Kylie Dorel, Sylvain Guével, Arnaud Hug, François
Copyright Year	2016
Abstract	The aim of this study was to determine how unilateral pain, induced in two knee extensor muscles, affects muscle coordination during a bilateral pedaling task. Fifteen participants performed a 4-min pedaling task at 130 W in two conditions (Baseline and Pain). Pain was induced by injection of hypertonic saline into the vastus medialis (VM) and vastus lateralis (VL) muscles of one leg. Force applied throughout the pedaling cycle was measured using an instrumented pedal and used to calculate pedal power. Surface electromyography (EMG) was recorded bilaterally from eight muscles to assess changes in muscle activation strategies. Compared to Baseline, during the Pain condition, EMG amplitude of muscles of the painful leg (VL and VM—the painful muscles, and RF—another quadriceps muscle with no pain) was lower during the extension phase [(mean ± SD): VL: −22.5 ± 18.9%; P < 0.001; VM: −28.8 ± 19.9%; P < 0.001, RF: −20.2 ± 13.9%; P < 0.001]. Consistent with this, pedal power applied by the painful leg was also lower during the extension phase (−16.8 ± 14.2 W, P = 0.001) during Pain compared to Baseline. This decrease was compensated for by an 11.3 ± 8.1 W increase in pedal power applied by the non-painful leg during its extension phase (P = 0.04). These results support pain adaptation theories, which suggest that when there is a clear opportunity to compensate, motor adaptations to pain occur to decrease load within the painful tissue. Although the pedaling task offered numerous possibilities for compensation, only between-leg compensations were systematically observed. This finding is discussed in relation to the mechanical and neural constraints of the pedaling task.
Starting Page	607
Ending Page	614
Page Count	8
File Format	PDF
ISSN	00144819
Journal	Experimental Brain Research
Volume Number	235
Issue Number	2
e-ISSN	14321106
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Muscle coordination Pedaling Force Electromyography Neurosciences Neurology
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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