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Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz

Increased force variability constitutes a hallmark of arm disabilities following stroke. Force variability is related to the modulation of force below 1 Hz in healthy young and older adults. However, whether the increased force variability observed post stroke is related to the modulation of force b...

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Autores principales: Lodha, Neha, Misra, Gaurav, Coombes, Stephen A., Christou, Evangelos A., Cauraugh, James H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873339/
https://www.ncbi.nlm.nih.gov/pubmed/24386208
http://dx.doi.org/10.1371/journal.pone.0083468
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author Lodha, Neha
Misra, Gaurav
Coombes, Stephen A.
Christou, Evangelos A.
Cauraugh, James H.
author_facet Lodha, Neha
Misra, Gaurav
Coombes, Stephen A.
Christou, Evangelos A.
Cauraugh, James H.
author_sort Lodha, Neha
collection PubMed
description Increased force variability constitutes a hallmark of arm disabilities following stroke. Force variability is related to the modulation of force below 1 Hz in healthy young and older adults. However, whether the increased force variability observed post stroke is related to the modulation of force below 1 Hz remains unknown. Thus, the purpose of this study was to compare force modulation below 1 Hz in chronic stroke and age-matched healthy individuals. Both stroke and control individuals (N = 26) performed an isometric grip task to submaximal force levels. Coefficient of variation quantified force variability, and power spectrum density of force quantified force modulation below 1 Hz with a high resolution (0.07 Hz). Analyses indicated that force variability was greater for the stroke group compared with to healthy controls and for the paretic hand compared with the non-paretic hand. Force modulation below 1 Hz differentiated the stroke individuals and healthy controls, as well as the paretic and non-paretic hands. Specifically, stroke individuals (paretic hand) exhibited greater power ∼0.2 Hz (0.07–0.35 Hz) and lesser power ∼0.6 Hz (0.49–0.77 Hz) compared to healthy controls (non-dominant hand). Similarly, the paretic hand exhibited greater power ∼0.2 Hz, and lesser power ∼0.6 Hz than the non-paretic hand. Moreover, variability of force was strongly predicted from the modulation of specific frequencies below 1 Hz (R (2) = 0.80). Together, these findings indicate that the modulation of force below 1 Hz provides significant insight into changes in motor control after stroke.
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spelling pubmed-38733392014-01-02 Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz Lodha, Neha Misra, Gaurav Coombes, Stephen A. Christou, Evangelos A. Cauraugh, James H. PLoS One Research Article Increased force variability constitutes a hallmark of arm disabilities following stroke. Force variability is related to the modulation of force below 1 Hz in healthy young and older adults. However, whether the increased force variability observed post stroke is related to the modulation of force below 1 Hz remains unknown. Thus, the purpose of this study was to compare force modulation below 1 Hz in chronic stroke and age-matched healthy individuals. Both stroke and control individuals (N = 26) performed an isometric grip task to submaximal force levels. Coefficient of variation quantified force variability, and power spectrum density of force quantified force modulation below 1 Hz with a high resolution (0.07 Hz). Analyses indicated that force variability was greater for the stroke group compared with to healthy controls and for the paretic hand compared with the non-paretic hand. Force modulation below 1 Hz differentiated the stroke individuals and healthy controls, as well as the paretic and non-paretic hands. Specifically, stroke individuals (paretic hand) exhibited greater power ∼0.2 Hz (0.07–0.35 Hz) and lesser power ∼0.6 Hz (0.49–0.77 Hz) compared to healthy controls (non-dominant hand). Similarly, the paretic hand exhibited greater power ∼0.2 Hz, and lesser power ∼0.6 Hz than the non-paretic hand. Moreover, variability of force was strongly predicted from the modulation of specific frequencies below 1 Hz (R (2) = 0.80). Together, these findings indicate that the modulation of force below 1 Hz provides significant insight into changes in motor control after stroke. Public Library of Science 2013-12-26 /pmc/articles/PMC3873339/ /pubmed/24386208 http://dx.doi.org/10.1371/journal.pone.0083468 Text en © 2013 Lodha et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Lodha, Neha
Misra, Gaurav
Coombes, Stephen A.
Christou, Evangelos A.
Cauraugh, James H.
Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz
title Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz
title_full Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz
title_fullStr Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz
title_full_unstemmed Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz
title_short Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz
title_sort increased force variability in chronic stroke: contributions of force modulation below 1 hz
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873339/
https://www.ncbi.nlm.nih.gov/pubmed/24386208
http://dx.doi.org/10.1371/journal.pone.0083468
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