Figure 4. Correlation between LF/HF differences during
tVNS and NWR thresholds.
A significant negative correlation was found between LF/HF changes
during tVNS and the NWR threshold change at Post 10 and Post 30,
indicating that subjects whose LF/HF significantly decreased during
tVNS, that is, those whose parasympathetic activity increased during
tVNS stimulation, tended to have larger increases in NWR threshold at
Post 10 and Post 30. No such correlation was observed at Post 0 (p
> 0.05).