I like the fact that you can measure your heart rate in real time, and that a comparison can be made to before and after the breathing strategies are carried out. (au.reachout.com)
The primary goal of the test is to measure the heart rate of the fetus in response to its own movements. (americanpregnancy.org)
It uses your real - time heart rate stats to measure your heart rate variability and determine the best breathing rate to suit your needs. (androidauthority.com)