2 Hz EA – OBF and MAP Summarized OBF (A, C, E) and MAP (B, D, F) responses in both the control rats and the PCO rats when stimulating with low-frequency (2 Hz) EA. Changes in OBF and MAP were calculated every minute (1 s record), and response magnitude is expressed as percentage of the pre-stimulus value at the time point 0 min. The vertical lines and thick horizontal bar indicate the time of stimulation. The onset of stimulation is indicated as zero. The data is expressed as mean ± SEM. †p < 0.05, ††p < 0.01 (control rats) * p < 0.05, **p < 0.01 (PCO rats), compared with the pre-stimulus control value.