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Cerebral cortex activation mapping upon electrical muscle stimulation by 32-channel time-domain functional near-infrared spectroscopy

conference contribution
posted on 2013-01-01, 00:00 authored by R Re, M Muthalib, D Contini, L Zucchelli, A Torricelli, L Spinelli, M Caffini, M Ferrari, V Quaresima, S Perrey, G Kerr
The application of different EMS current thresholds on muscle activates not only the muscle but also peripheral sensory axons that send proprioceptive and pain signals to the cerebral cortex. A 32-channel time-domain fNIRS instrument was employed to map regional cortical activities under varied EMS current intensities applied on the right wrist extensor muscle. Eight healthy volunteers underwent four EMS at different current thresholds based on their individual maximal tolerated intensity (MTI), i.e., 10 % < 50 % < 100 % < over 100 % MTI. Time courses of the absolute oxygenated and deoxygenated hemoglobin concentrations primarily over the bilateral sensorimotor cortical (SMC) regions were extrapolated, and cortical activation maps were determined by general linear model using the NIRS-SPM software. The stimulation-induced wrist extension paradigm significantly increased activation of the contralateral SMC region according to the EMS intensities, while the ipsilateral SMC region showed no significant changes. This could be due in part to a nociceptive response to the higher EMS current intensities and result also from increased sensorimotor integration in these cortical regions.

History

Event

International Society on Oxygen Transport to Tissue. Annual Meeting (40th : 2012 : Bruges, Belgium)

Volume

789

Series

Advances in Experimental medicine and Biology

Pagination

441 - 447

Publisher

Springer

Location

Bruges, Belgium

Place of publication

New York, N.Y.

Start date

2012-08-19

End date

2012-08-24

ISSN

0065-2598

Language

eng

Notes

Chapter 59 of Oxygen Transport to Tissue XXXV

Publication classification

E1.1 Full written paper - refereed; E Conference publication

Copyright notice

2013, Springer

Title of proceedings

ISOTT 2012 : Proceedings of the 40th Annual Meeting of the International Society on Oxygen Transport to Tissue

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