Curious how this topic comes up today. I woke too early and was trying to get back to sleep, but I was in a position where I could hear my heart beating in my ears, so with nothing better to do I did a rate test and came up with 50. Quite a bit different than a few years ago when it was more like 68. While at dinner the other night I tested my friend's 8 y.o. daughter and her HR was 80. Little person, little heart, more BPM.