Fig. 6

Analysis of Heart Rate Variability (HRV). a Low frequency component (LF) in the control group, PBC group (pretreatment), before and after TN, and before and after sham-TN); b High frequency component (HF) in the control group, PBC group (pretreatment), before and after TN, and before and after sham-TN); c LF/HF ratio in the control group, PBC group (pretreatment), before and after TN, and before and after sham-TN). (n = 10)