I have a natural low rate heart beat..46-52 is normal for me.
I have to remind all medical personnel about this at every visit. Its especially important when having surgery done under anesthesia. It makes my drs go whacko as my heart rate has been known to drop to 32bpm. And every time I see my neurologist she insists on retaking my heart rate manually because she doesn't trust the machines.
I am convienced this condition is inherited ... my dad's heart rate was the same as mine and so is my son's. When I do to the drs and my heart rate is 55+ I am known to say... gee something must be off in my body