Maybe you all will know the answer here (or have some good guesses).
This is a great question.
That IS a great question, and I would love to know what her doctor tells her, as well.
That would make sense, since it's true for the rest of us.
Interesting point and question...
I would think that in the interest of maintaining homeostasis and just ensuring that things continue to function normally that the heart will develop a way to compensate for the decreased heart rate.
Interesting thought. It's like a very fit individual with a lower heart rate also gets a lot of cardiovascular benefits because the heart is more efficient. We need a cardiologist who specializes in fitness!