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Is better preservation of eccentric strength after stroke due to altered prefrontal function?
Umeå Univ, Umeå, Sweden.
Umeå Univ, Umeå, Sweden.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
Umeå Univ, Umeå, Sweden.
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2016 (English)In: Neurocase, ISSN 1355-4794, E-ISSN 1465-3656, Vol. 22, no 2, 229-242 p.Article in journal (Refereed) Published
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Abstract [en]

Ventrolateral prefrontal cortex (VLPFC) is part of a network that exerts inhibitory control over the motor cortex (MC). Recently, we demonstrated that VLPFC was more activated during imagined maximum eccentric than during imagined concentric contractions in healthy participants. This was accompanied with lower activation levels within motor regions during imagined eccentric contractions. The aim was to test a novel hypothesis of an involvement of VLPFC in contraction mode-specific modulation of force. Functional magnetic resonance imaging was used to examine differences in VLPFC and motor regions during the concentric and the eccentric phases of imagined maximum contractions in a selected sample of subjects with stroke (n=4). The subjects were included as they exhibited disturbed modulation of force. The previously demonstrated pattern within VLPFC was evident only on the contralesional hemisphere. On the ipsilesional hemisphere, the recruitment in VLPFC was similar for both modes of contractions. The findings support a hypothesis of the involvement of VLPFC in contraction mode-specific modulation of maximum force production. A disturbance of this system might underlie the lack of contraction mode-specific modulation commonly found among stroke subjects, often expressed as an increased ratio between eccentric and concentric strength.

Place, publisher, year, edition, pages
2016. Vol. 22, no 2, 229-242 p.
Keyword [en]
Motor imagery, fMRI, stroke, eccentric, concentric, inhibition
National Category
Neurology
Identifiers
URN: urn:nbn:se:miun:diva-27247DOI: 10.1080/13554794.2015.1130232ISI: 000369770400016PubMedID: 26750576Scopus ID: 2-s2.0-84956648177OAI: oai:DiVA.org:miun-27247DiVA: diva2:913423
Available from: 2016-03-21 Created: 2016-03-17 Last updated: 2017-01-18Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
  • html
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  • asciidoc
  • rtf