Figure 5
From: Shoulder transcutaneous electric nerve stimulation decreases heart rate via potentiating vagal tone
Spectrum analysis of heart rate variability. (A, B) Power of the low-frequency (LF) and high-frequency spectra as well as (C) Power ratio of LF to HF spectrum (LF/HF) at baseline control (CONT) and during the period of sham stimulation (TENS-S) and TENS on the right and left shoulder (TENS-R and TENS-L, respectively). (A–C) all DF = 2, F = 3.48, 3.30, and 3.19, respectively; all p < 0.05 among groups; all DF = 1, F = 21.63, 21.04, and 15.40, respectively; all p < 0.01 between treatment; Two-way ANOVA. *p < 0.05 versus baseline control; post hoc.
