Faculty Collaboration Database

Inter-Joint Coordination Deficits Revealed in the Decomposition of Endpoint Jerk During Goal-Directed Arm Movement After Stroke. IEEE Trans Neural Syst Rehabil Eng 2017 Jul;25(7):798-810

Date

01/17/2017

Pubmed ID

28092567

DOI

10.1109/TNSRE.2017.2652393

Scopus ID

2-s2.0-85029377618 (requires institutional sign-in at Scopus site)   19 Citations

Abstract

It is well documented that neurological deficits after stroke can disrupt motor control processes that affect the smoothness of reaching movements. The smoothness of hand trajectories during multi-joint reaching depends on shoulder and elbow joint angular velocities and their successive derivatives as well as on the instantaneous arm configuration and its rate of change. Right-handed survivors of unilateral hemiparetic stroke and neurologically-intact control participants held the handle of a two-joint robot and made horizontal planar reaching movements. We decomposed endpoint jerk into components related to shoulder and elbow joint angular velocity, acceleration, and jerk. We observed an abnormal decomposition pattern in the most severely impaired stroke survivors consistent with deficits of inter-joint coordination. We then used numerical simulations of reaching movements to test whether the specific pattern of inter-joint coordination deficits observed experimentally could be explained by either a general increase in motor noise related to weakness or by an impaired ability to compensate for multi-joint interaction torque. Simulation results suggest that observed deficits in movement smoothness after stroke more likely reflect an impaired ability to compensate for multi-joint interaction torques rather than the mere presence of elevated motor noise.

Author List

Laczko J, Scheidt RA, Simo LS, Piovesan D

Author

Robert Scheidt BS,MS,PhD Associate Professor in the Biomedical Engineering department at Marquette University

MESH terms used to index this publication - Major topics in bold

Adult
Aged
Arm
Computer Simulation
Humans
Joints
Middle Aged
Models, Neurological
Movement
Muscle Contraction
Muscle, Skeletal
Paresis
Postural Balance
Psychomotor Performance
Stroke
Torque