That was a typo on mine as well. It has been edited. The old parameters for heart rates were higher when I was studying, but 50 bpm is on the low end of the new numbers. My concern for Len is his age and CHF when looking at his heart rate. As we get older, ones heart rate tends to increase. This is also true if we put on extra weight. If it remains low in spite of this, it could be pathological. That was my only point.