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Bimanual coordination of force enhances interhemispheric inhibition between the primary motor cortices

Hiraoka, Koichia; Ae, Minoria; Ogura, Nanaa; Sano, Chisaa; Shiomi, Keigoa; Morita, Yujia; Yokoyama, Harukaa; Jono, Yasutomob; Nomura, Yoshifumib; Tani, Keisukeb; Chujo, Yutab

doi: 10.1097/WNR.0000000000000248
INTEGRATIVE SYSTEMS
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The purpose of this study was to elucidate whether bimanual coordination of force affects interhemispheric inhibition (IHI) between the primary motor cortices (M1s). IHI with the index fingers isometrically abducted against a fixed plate (AAP task) was compared with IHI with the index fingers isometrically abducted against each other (AAF task). The index fingers were held stationary at the midline and activity levels of the first dorsal interosseous muscles were equalized between the tasks. The abduction force of each index finger was individually controlled during the AAP task, and bimanually coordinated during the AAF task. IHI during the AAF task was significantly higher than that during the AAP task. IHI between the M1s is related not only to the suppression of unwanted activity of the M1 contralateral to the active M1 but also to bimanual coordination of force.

aCollege of Health and Human Sciences

bGraduate School of Comprehensive Rehabilitation, Osaka Prefecture University, Habikino, Osaka, Japan

Correspondence to Koichi Hiraoka, College of Health and Human Sciences, Osaka Prefecture University, 3-7-30 Habikino, Habikino city, Osaka 583-8555, Japan Tel: +81 72 950 2875; fax: +81 72 950 2130; e-mail: hiraoka@rehab.osakafu-u.ac.jp

Received June 11, 2014

Accepted July 23, 2014

© 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins