Abstract
In eight healthy male volunteers, fNIRS was used to measure relative changes in oxyhaemoglobin (O2 Hb) and deoxyhaemoglobin (HHb) concentrations from a cortical sensorimotor region of interest in the left (LH) and right (RH) hemispheres during NMES-evoked and VOL wrist extension movements of the right arm. NMES-evoked movements induced significantly greater activation (increase in O2 Hb and concomitant decrease in HHb) in the contralateral LH than in the ipsilateral RH (O2 Hb: 0·44±0·16μM and 0·25±0·22μM, P=0·017; HHb: -0·19±0·10μM and -0·12±0·09μM, P=0·036, respectively) as did VOL movements (0·51±0·24 μΜ and 0·34±0·21μM, P=0·031; HHb: -0·18±0·07 μΜ and -0·12±0·04 μΜ, P=0·05, respectively). There was no significant difference between conditions for O2 Hb (P=0·144) and HHb (P=0·958). fNIRS neuroimaging enables quantification of bilateral sensorimotor regional activation profiles during voluntary and NMES-evoked wrist extension movements.
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