Stimulation of the spinal cord (10, 20, 50, 75 or 100 Hz, at 300 μA, 1 ms pulse for 5 s) evoked comparable rises in SNA (A), accompanied by attenuated increases in MAP (B) in rats exposed to CIH (n = 5) compared to control rats (n = 5). **Significantly different from control rats, P < 0.01, unpaired t test.