Multichannel time domain fNIRS mapping of cortical activation and superficial systemic responses during neuromuscular electrical stimulation

R. Re; M. Muthalib; L. Zucchelli; S. Perrey; D. Contini; M. Caffini; L. Spinelli; G. Kerr; A. Torricelli

doi:10.1117/12.2032512

24 June 2013 Multichannel time domain fNIRS mapping of cortical activation and superficial systemic responses during neuromuscular electrical stimulation

R. Re, M. Muthalib, L. Zucchelli, S. Perrey, D. Contini, M. Caffini, L. Spinelli, G. Kerr, A. Torricelli

Author Affiliations +

Proceedings Volume 8804, Neurophotonics; 880404 (2013) https://doi.org/10.1117/12.2032512
Event: European Conferences on Biomedical Optics, 2013, Munich, Germany

Abstract

We recorded maps of cortical and systemic hemodynamic responses (oxy-hemoglobin, O₂Hb and deoxy-hemoglobin, HHb) during incremental neuromuscular electrical stimulation (NMES) of the right forearm in nine subjects by a 32- channel time domain fNIRS (TD-fNIRS) instrument. Statistical parametric maps (SPM) relative to the different current stimulations (under and over the maximal tolerated intensity-MTI) versus the 10%MTI were generated. Exploiting the temporal information contained in the TD-fNIRS signal it was possible to create different maps referring to the deeper (cortical activations) and the more superficial (systemic changes) head layers. The increasing of the stimulation current on the right forearm muscle produced a significantly larger bilateral sensorimotor and prefrontal cortical activations (i.e. increase in the O2Hb and decrease in HHb) than the systemic changes. Physiological parameters (heart rate, breathing rate and skin conductance) were also monitored.

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R. Re, M. Muthalib, L. Zucchelli, S. Perrey, D. Contini, M. Caffini, L. Spinelli, G. Kerr, and A. Torricelli "Multichannel time domain fNIRS mapping of cortical activation and superficial systemic responses during neuromuscular electrical stimulation", Proc. SPIE 8804, Neurophotonics, 880404 (24 June 2013); https://doi.org/10.1117/12.2032512

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