Asmussen MJ; Bailey AZ; Nelson AJ. Institution Asmussen,M J. Department of Kinesiology, McMaster University, Hamilto n L8S 4K1, Canada. Electronic address: email@example.com. Bailey,A Z. Department of Kinesiology, McMaster University, Hamilt on L8S 4K1, Canada. Electronic address: firstname.lastname@example.org. Nelson,A J. Department of Kinesiology, McMaster University, Hamilton L8S 4K1, Canada. Electronic address: email@example.com.
Cortical and corticospinal output modulations during r eaching movements with varying directions and magnitudes of interaction torques.
Source: Neuroscience. 311:268-83, 2015 Dec 17.
Abstract: The neural command required to coordinate a multi-joint movem ent is inherently complex. During multi-joint movement of the limb, the force created from movement at one joint may create a torque at a second j oint known as an interaction torque. Interaction torques may be assist ive or resistive thereby aiding or opposing the motion of the second joint, respectively. For movement to be effectively controlled, the cen tral nervous system should modulate neural output to the muscles to appropriately account for interaction torques. The present stud y examined the neural output from the primary motor cortex before and dur ing reaching movements that required different combinations of assistive an d resistive interaction torques occurring at the shoulder and elbow joint s. Using transcranial magnetic stimulation to probe neural output fro m the primary motor cortex, results indicate that corticospinal output c ontrolling the upper arm is related to resistive interaction torques occurr ing at the shoulder joint. Further, cortical output to bi-articul ar muscles is associated with interaction torque and this may be driven by t he fact that these muscles are in an advantageous position to control torq ues produced between inter-connection segments. Humans have a tendency to avoid reaching movements that involve resistive interaction torques and this may be driven by the requirement of increased neural output asso ciated with these movements.
Copyright © 2015 IBRO. Published by Elsevi er Ltd. All rights reserved.
Publication Type Journal Article. Research Support, Non-U.S. Gov't.