Multichannel time domain fNIRS mapping of cortical activation and superficial systemic responses during neuromuscular electrical stimulation
time domain fNIRS
NMES
myostimulation
Time domain fNIRS
Statistical parametric mapping
cortical activation
Myostimul
Cortical activation
01 natural sciences
Cortical imaging
03 medical and health sciences
statistical parametric mapping
Blood oxygenation
0302 clinical medicine
Sensorimotor
blood oxygenation
0103 physical sciences
cor
Myostimulation
sensorimotor
DOI:
10.1117/12.2032512
Publication Date:
2013-06-24T15:30:46Z
AUTHORS (9)
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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