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Different Hemodynamic Responses of the Primary Motor Cortex Accompanying Eccentric and Concentric Movements: A Functional NIRS Study

Borot, L, Vergotte, G and Perrey, S (2018) Different Hemodynamic Responses of the Primary Motor Cortex Accompanying Eccentric and Concentric Movements: A Functional NIRS Study. Brain Sciences, 8 (5). ISSN 2076-3425

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Abstract

The literature contains limited evidence on how our brains control eccentric movement. A higher activation is expected in the contralateral motor cortex (M1) but consensus has not yet been reached. Therefore, the present study aimed to compare patterns of M1 activation between eccentric and concentric movements. Nine healthy participants performed in a randomized order three sets of five repetitions of eccentric or concentric movement with the dominant elbow flexors over a range of motion of 60◦ at two velocities (30◦/s and 60◦/s). The tests were carried out using a Biodex isokinetic dynamometer with the forearm supported in the horizontal plane. The peak torque values were not significantly different between concentric and eccentric movements (p = 0.42). Hemodynamic responses of the contralateral and ipsilateral M1 were measured with a near-infrared spectroscopy system (Oxymon MkIII, Artinis). A higher contralateral M1 activity was found during eccentric movements (p = 0.04, η2 = 0.47) and at the velocity of 30◦/s (p = 0.039, η2 = 0.48). These preliminary findings indicate a specific control mechanism in the contralateral M1 to produce eccentric muscle actions at the angular velocities investigated, although the role of other brain areas in the motor control network cannot be excluded.

Item Type: Article
Uncontrolled Keywords: 1109 Neurosciences, 1701 Psychology, 1702 Cognitive Sciences
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions: Sports & Exercise Sciences
Publisher: MDPI
Related URLs:
Date Deposited: 11 Oct 2019 11:44
Last Modified: 11 Oct 2019 11:45
DOI or Identification number: 10.3390/brainsci8050075
URI: http://researchonline.ljmu.ac.uk/id/eprint/11559

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