Figure 1. The influence of afferent barrages on dorsal spinal cord blood flow measured by laser Doppler flowmetry (A, B and D) or microelectrode hydrogen clearance polarography (C).

Ipsilateral, but not contralateral simulation increased blood flow, independent of the order of the stimulation train (A, B and C). The hydrogen clearance studies provide selective dorsal horn grey matter blood flow values (C). Capsaicin stimulation evoked a much larger rise in RBC (erythrocyte) flux (D).* Significantly different from pre (A, B and D) or none (C). (See statistical description in Tables 1 and 2)