Compensating for intersegmental dynamics across the shoulder, elbow, and wrist joints during feedforward and feedback control

Journal of Neurophysiology
Rodrigo S MaedaJ Andrew Pruszynski

Abstract

Moving the arm is complicated by mechanical interactions that arise between limb segments. Such intersegmental dynamics cause torques applied at one joint to produce movement at multiple joints, and in turn, the only way to create single joint movement is by applying torques at multiple joints. We investigated whether the nervous system accounts for intersegmental limb dynamics across the shoulder, elbow, and wrist joints during self-initiated planar reaching and when countering external mechanical perturbations. Our first experiment tested whether the timing and amplitude of shoulder muscle activity account for interaction torques produced during single-joint elbow movements from different elbow initial orientations and over a range of movement speeds. We found that shoulder muscle activity reliably preceded movement onset and elbow agonist activity, and was scaled to compensate for the magnitude of interaction torques arising because of forearm rotation. Our second experiment tested whether elbow muscles compensate for interaction torques introduced by single-joint wrist movements. We found that elbow muscle activity preceded movement onset and wrist agonist muscle activity, and thus the nervous system predicted interaction t...Continue Reading

References

Aug 23, 2018·Journal of Neurophysiology·Frédéric Crevecoeur, Isaac L Kurtzer
Jun 5, 2019·The European Journal of Neuroscience·Sasha ReschechtkoJ Andrew Pruszynski
Feb 27, 2020·Journal of Neurophysiology·Rodrigo S MaedaJ Andrew Pruszynski
Aug 29, 2019·Journal of Neurophysiology·Alexander MathisSamuel D McDougle
Nov 10, 2017·Journal of Neurophysiology·Jeffrey WeilerJ Andrew Pruszynski

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Related Concepts

Elbow Joint Structure
Articular System
Elbow
Entire Nervous System
Set of Muscles
JOINT Movement Glucoseamine, Chondroitin, MSN SOLN
Wrist Joint
Entire Elbow Region
Joint Structure of Shoulder Region
Shoulder

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