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Effect of EFS at a) 3Hz and at b) 20Hz for the entire 10 s of EFS in the presence of inhibitors. The area under the contractile curve immediately before EFS was defined as 0%; positive values represent a stimulatory effect on contractile activity, while negative values represent an inhibitory effect. In the presence of these inhibitors, various significant difference of the effect of EFS compared to baseline control condition for the entire 10 s.
