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Examining impairment of adaptive compensation for stabilizing motor repetitions in stroke survivors

Authors
Kim, YushinKoh, KyungYoon, BumChulKim, Woo-SubShin, Joon-HoPark, Hyung-SoonShim, Jae Kun
Issue Date
12월-2017
Publisher
SPRINGER
Keywords
Stroke; Patient outcome assessment; Fingers; Psychomotor performance; Nervous system; Functional capacity impairment
Citation
EXPERIMENTAL BRAIN RESEARCH, v.235, no.12, pp.3543 - 3552
Indexed
SCIE
SCOPUS
Journal Title
EXPERIMENTAL BRAIN RESEARCH
Volume
235
Number
12
Start Page
3543
End Page
3552
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81317
DOI
10.1007/s00221-017-5074-5
ISSN
0014-4819
Abstract
The hand, one of the most versatile but mechanically redundant parts of the human body, suffers more and longer than other body parts after stroke. One of the rehabilitation paradigms, task-oriented rehabilitation, encourages motor repeatability, the ability to produce similar motor performance over repetitions through compensatory strategies while taking advantage of the motor system's redundancy. The previous studies showed that stroke survivors inconsistently performed a given motor task with limited motor solutions. We hypothesized that stroke survivors would exhibit deficits in motor repeatability and adaptive compensation compared to healthy controls in during repetitive force-pulse (RFP) production tasks using multiple fingers. Seventeen hemiparetic stroke survivors and seven healthy controls were asked to repeatedly press force sensors as fast as possible using the four fingers of each hand. The hierarchical variability decomposition model was employed to compute motor repeatability and adaptive compensation across finger-force impulses, respectively. Stroke survivors showed decreased repeatability and adaptive compensation of force impulses between individual fingers as compared to the control (p < 0.05). The stroke survivors also showed decreased pulse frequency and greater peak-to-peak time variance than the control (p < 0.05). Force-related variables, such as mean peak force and peak force interval variability, demonstrated no significant difference between groups. Our findings indicate that stroke-induced brain injury negatively affects their ability to exploit their redundant or abundant motor system in an RFP task.
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