Increased prefrontal activity and reduced motor cortex activity during imagined eccentric compared to concentric muscle actions
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Increased prefrontal activity and reduced motor cortex activity during imagined eccentric compared to concentric muscle actions. / Olsson, C. J.; Hedlund, M.; Sojka, P.; Lundström, R.; Lindström, B.
I: Frontiers in Human Neuroscience, Bind 6, 255, 2012.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Increased prefrontal activity and reduced motor cortex activity during imagined eccentric compared to concentric muscle actions
AU - Olsson, C. J.
AU - Hedlund, M.
AU - Sojka, P.
AU - Lundström, R.
AU - Lindström, B.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - Concentric
KW - Eccentric
KW - fMRI
KW - Force modulation
KW - Motor imagery
U2 - 10.3389/fnhum.2012.00255
DO - 10.3389/fnhum.2012.00255
M3 - Journal article
AN - SCOPUS:84867188903
VL - 6
JO - Frontiers in Human Neuroscience
JF - Frontiers in Human Neuroscience
SN - 1662-5161
M1 - 255
ER -
ID: 339261570