Fig. 6.

Average physiological changes ($\text{mean}\pm \mathrm{SE}$) over 10 subjects in rBF (a), $\mathrm{\Delta }[\mathrm{Hb}{\mathrm{O}}_2]$ (b), $\mathrm{\Delta }[\mathrm{Hb}]$ (c), ABP (d), and heart rate (e) during ES at 2, 10, and 50 Hz. The changes for each subject were calculated by averaging the data over the last 3 min during ES.