a decreasing trendP > 0.05
an increasing trendP > 0.05
2 C); however, LDTN stimulation decreased the LF/HF ratio (LF/HF ratio 1.06 ± 0.29 versus 2.11 ± 0.46, P < 0.05), the LF (nu) value showed a decreasing trend (LF 36.99 ± 10.50 versus 53.03 ± 14.46, P > 0.05) and the HF (nu) showed an increasing trend (HF 35.95 ± 11.48 versus 31.34 ± 6.13, P > 0.05).