Shoulder abduction loading affects motor coordination in individuals with chronic stroke, informing targeted rehabilitation
IEEE RAS/EMBS International Conference on Biomedical Robotics and Biomechatronics, 2020 Individuals post stroke experience motor impairments, such as loss of independent joint control, leading to an overall reduction in arm function. Their motion becomes slower and more discoordinated, making it dif...
Gespeichert in:
Hauptverfasser: | , , , , , |
---|---|
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext bestellen |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | IEEE RAS/EMBS International Conference on Biomedical Robotics and
Biomechatronics, 2020 Individuals post stroke experience motor impairments, such as loss of
independent joint control, leading to an overall reduction in arm function.
Their motion becomes slower and more discoordinated, making it difficult to
complete timing-sensitive tasks, such as balancing a glass of water or carrying
a bowl with a ball inside it. Understanding how the stroke-induced motor
impairments interact with each other can help design assisted training regimens
for improved recovery. In this study, we investigate the effects of abnormal
joint coupling patterns induced by flexion synergy on timing-sensitive motor
coordination in the paretic upper limb. We design a virtual ball-in-bowl task
that requires fast movements for optimal performance and implement it on a
robotic system, capable of providing varying levels of abduction loading at the
shoulder. We recruit 12 participants (6 individuals with chronic stroke and 6
unimpaired controls) and assess their skill at the task at 3 levels of loading,
defined by the vertical force applied at the robot end-effector. Our results
show that, for individuals with stroke, loading has a significant effect on
their ability to generate quick coordinated motion. With increases in loading,
their overall task performance decreases and they are less able to compensate
for ball dynamics---frequency analysis of their motion indicates that abduction
loading weakens their ability to generate movements at the resonant frequency
of the dynamic task. This effect is likely due to an increased reliance on
lower resolution indirect motor pathways in individuals post stroke. Given the
inter-dependency of loading and dynamic task performance, we can create
targeted robot-aided training protocols focused on improving timing-sensitive
motor control, similar to existing progressive loading therapies, which have
shown efficacy for expanding reachable workspace post stroke. |
---|---|
DOI: | 10.48550/arxiv.2007.04778 |