Absolute heart rate, no, but heart rate variability, yes. It took a lot of research to make it accurate. https://help.fitbit.com/articles/en_US/Help_article/21

Absolute heart rate, no, but heart rate variability, yes. It took a lot of research to make it accurate. https://help.fitbit.com/articles/en_US/Help_article/2163#AutomaticDetection https://help.fitbit.com/articles/en_US/Help_article/2163#Aut...