While in the middle of a 30 minute HIIT session when my heart rate is up in the 120’s and 130’s (54 yr old male) the monitor will show my heart rate dropping to my resting rate and below. After a few minutes it will recover and show the right (assumed) heart rate again, very frustrating.
https://www.amazon.com/Wahoo-TICKR-Heart-Armband-Bluetooth/dp/B078GRMFSN

