Figure 3
From: Shoulder transcutaneous electric nerve stimulation decreases heart rate via potentiating vagal tone
Mean heart rate (HR) of subjects in response to (A) sham stimulation (TENS-S) and (B, C) TENS on the right and left shoulder (TENS-R and TENS-L, respectively). The black bar at the bottom indicates the stimulation period. DF = 2, F = 5.31; p < 0.01 among groups; DF = 9, F = 1.94; p < 0.05 among time points; Two-way ANOVA. *p < 0.05; **p < 0.01 versus baseline control; post hoc.
