Task-dependent modulation of propriospinal inputs to human shoulder

Journal of Neurophysiology
Lynley V RobertsWinston D Byblow

Abstract

In the human upper limb a proportion of the descending corticospinal command may be relayed through cervical propriospinal premotoneurons. This may serve to coordinate movements involving multiple joints of the arm, such as reaching. The present study was conducted to determine whether a shoulder stabilizing muscle, infraspinatus (INF), is functionally integrated into the putative cervical propriospinal network, and whether there is task-dependent modulation of the network. Fourteen healthy adults participated in this study. Responses in the right INF were evoked by transcranial magnetic stimulation over the motor cortex and compared with responses conditioned by ulnar nerve stimulation. Interstimulus intervals were chosen to summate inputs at the level of the premotoneurons. Participants performed a forearm and shoulder muscle cocontraction task or a grip-lift task that also coactivated forearm and shoulder muscles. During the cocontraction task, INF motor-evoked potentials were significantly facilitated by ulnar nerve stimulation at low intensities and suppressed at higher intensities. Only facilitation reached significance during the grip-lift task. We have shown for the first time that propriospinal pathways may connect the...Continue Reading

References

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Citations

Apr 27, 2013·BMC Neuroscience·Suzy NgomoJean-Sébastien Roy
Mar 15, 2016·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Sina SangariVéronique Marchand-Pauvert
Apr 23, 2015·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Lynley BradnamSheila Lennon
Aug 18, 2009·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Gwyn N Lewis, Peter J McNair
Sep 22, 2009·Muscle & Nerve·Gwyn N Lewis, Peter J McNair
Jul 21, 2015·Journal of Shoulder and Elbow Surgery·Damien BachassonSamuel R Ward
Mar 31, 2015·Experimental Brain Research·Yin-Liang LinAndrew Karduna
Oct 28, 2011·Journal of Neurophysiology·Louis-Solal GiboinVéronique Marchand-Pauvert

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