‘In our experiment, with a short [Wi-Fi and DECT cordless phone] exposure of 10 minutes, EMF effects on HRV were found even though the power flux density was only 0.000275% of the ICNIRP limit…’

PDF https://thesai.org/Downloads/Volume15No6/Paper_9-Evaluating_the_Effect_on_Heart_Rate_Variability_of_Adults.pdf

https://thesai.org/Publications/ViewPaper?Volume=15&Issue=6&Code=IJACSA&SerialNo=9