Vagal stimulation of the hea causes all, EXCEPT:
Parasympathetic supply to the hea by vagus nerve causes decreased hea rate, decreased force of contraction, decreased cardiac output. R-R interval is the time interval between consecutive hea beats in the ECG. So a decrease in hea rate increases the R-R interval.
Decreased Hea Rate
Decreased force of Hea contraction
Decreased Cardiac Output.
Decreased R-R interval in ECG