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Increased prefrontal activity and reduced motor cortex activity during imagined eccentric compared to concentric muscle actions
Centre for Population Studies, Ageing and Living Conditions, Umeå University, S-901 87 Umeå, Sweden.
Department of Community Medicine and Rehabilitation, Umeå University, Umeå, Sweden.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden.
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2012 (English)In: Frontiers in Human Neuroscience, ISSN 1662-5161, E-ISSN 1662-5161, no SEP, Art. no. 255- p.Article in journal (Refereed) Published
Abstract [en]

In this study we used functional magnetic resonance imaging (fMRI) to examine differences in recruited brain regions during the concentric and the eccentric phase of an imagined maximum resistance training task of the elbow flexors in healthy young subjects. The results showed that during the eccentric phase, pre-frontal cortex (BA44) bilaterally was recruited when contrasted to the concentric phase. During the concentric phase, however, the motor and pre-motor cortex (BA 4/6) was recruited when contrasted to the eccentric phase. Interestingly, the brain activity of this region was reduced, when compared to the mean activity of the session, during the eccentric phase. Thus, the neural mechanisms governing imagined concentric and eccentric contractions appear to differ. We propose that the recruitment of the pre-frontal cortex is due to an increased demand of regulating force during the eccentric phase. Moreover, it is possible that the inability to fully activate a muscle during eccentric contractions may partly be explained by a reduction of activity in the motor and pre-motor cortex.

Place, publisher, year, edition, pages
2012. no SEP, Art. no. 255- p.
Keyword [en]
motor imagery, fMRI, eccentric, concentric, force modulation
National Category
URN: urn:nbn:se:miun:diva-17248DOI: 10.3389/fnhum.2012.00255ISI: 000308479700001ScopusID: 2-s2.0-84867188903OAI: diva2:563219
Available from: 2012-10-29 Created: 2012-10-27 Last updated: 2016-10-17Bibliographically approved

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