HRV and E-field magnitude
A significant association was found between both measures of HRV (RMSSD and HF-HRV) and the E-field magnitude in all brain regions of interest, showing that stronger E-field are able to induce greater HRV changes (Table 1 and Figures 3 and 4).
Table 1. Mixed effects model outcomes showing the association between E-field strength in the brain regions of interest and HRV modulation.