Persistence of inter-joint coupling during single-joint elbow flexions after shoulder fixation

Experimental Brain Research
Derek B Debicki, Paul L Gribble

Abstract

Single-joint elbow flexions are associated with muscle activity at the shoulder that opposes interaction torques arising from rotation of the elbow. We have previously shown that this activity is linearly related to elbow muscle torque and is robust in the presence of novel dynamic loads. Here we examined this relationship in the context of shoulder joint fixation. We tested the hypothesis that after mechanically fixing the shoulder the relationship between shoulder muscle activity and elbow muscle torque will be preserved. In contrast, proposals in which energetic variables are optimized predict that shoulder muscle activity should cease. Subjects performed single-joint elbow flexions in a horizontal plane while interacting with the KINARM robotic exoskeleton. After repeated movements with the shoulder joint fixed we observed a slight and gradual decrease in the activity of pectoralis major relative to movements in which the shoulder was free to rotate. However the strength of the coupling between the shoulder and elbow did not change after shoulder fixation. This is consistent with our previous findings and suggests that the nervous system maintains this inter-joint coupling relationship even when activity at the fixed joint ...Continue Reading

References

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Citations

Mar 10, 2006·Experimental Brain Research·N CothrosPaul L Gribble
May 11, 2010·Experimental Brain Research·Derek B DebickiJon Hore
Apr 23, 2013·Experimental Brain Research·Christoph Schütz, Thomas Schack
Jul 16, 2010·Journal of Neurophysiology·Liana E BrownPaul L Gribble
Dec 17, 2011·PloS One·Liana E BrownNicole Malfait
Feb 20, 2013·Acta Psychologica·Christoph Schütz, Thomas Schack
Sep 4, 2009·Perceptual and Motor Skills·Hiroshi YamasakiHiroshi Nagasaki
Dec 1, 2009·Human Movement Science·Till BockemühlVolker Dürr
Jun 7, 2014·Frontiers in Human Neuroscience·Thomas SchackDirk Koester
Nov 27, 2014·Frontiers in Computational Neuroscience·Thomas Buhrmann, Ezequiel A Di Paolo
Aug 2, 2014·Journal of Neural Engineering·George A TsianosGerald E Loeb
Aug 23, 2018·Journal of Neurophysiology·Frederic Crevecoeur, Isaac Kurtzer
Apr 19, 2013·Journal of Neurophysiology·Tricia L GiboAmy J Bastian
Feb 27, 2020·Journal of Neurophysiology·Rodrigo S MaedaJ Andrew Pruszynski
Mar 12, 2016·Experimental Brain Research·Christoph SchützThomas Schack
Nov 23, 2020·The European Journal of Neuroscience·Rodrigo S MaedaJ Andrew Pruszynski

Related Concepts

Upper Arm
Kinematics
Elbow Joint Structure
Surface Electromyography
Inotropism
Joint Structure of Shoulder Region
Passive Range of Motion Function
Soleus Muscle Structure
Torque

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