Fig. 2
The basic HR was no significant difference between three groups. At 3āmin after begin of VNS, the HR in SV group was lower than the other groups. And at 3āmin after stop of VNS, the HR of SV group was slightly increased, compared to the other groups. Tenāmin after stopping VNS, the HR of SV group return to the basic level, no difference of HR between three groups