Now, this formula, and others, for that matter, may do a decent job of estimating maximum heart rate for a large group of people, but it could be very misleading for a specific person. I can cite two people, whom I tested on numerous occasions, whose maximum heart rates fell far from their predicted values. One male runner, at age 30, had a maximum heart rate of 148, and this same runner, at age 55, had a maximum heart rate of 146. You can imagine how far off you would be if you told this runner, when he was 30 years old, that to run at 86 percent of his maximum heart rate he would need to
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