Even in athletes, it may take hours to recover the completely "baseline" heart rate. Your muscles need blood supply for a long time after heavy exercise, your metabolism is increased, etc, which is why you burn fat for quite some time after exercise. In addition, your blood pressure is lowered.
If I exercise at rate 180 (heavy), my heart rate drops to 145 after a minute, 125 after two minutes, 110 after three and 90-100 after 4-5 minutes. It tends to stay in the 80s for an hour or so. And I consider myself fairly healthy.
There's a process for measuring heart recovery time (if that's what you are talking about)
If you are exercising with your heart rate in your target zone (for a 40 year old that's 108-144) the difference between your peak heart rate right after you stop exercise and what your heart rate is exactly 2 minutes later should be >22. The larger this number the better.
In other words, if I've been exercising I would take my heart rate right when I stop. Let's say it's 140. Then exactly 2 minutes after this while I'm resting my heart rate is 110, the difference is 30. This is a healthy hear rate recovery time.
Let's say right when I stop it's 140, then 2 minutes later it's 130 (while at complete rest). That's a difference of 10, which isn't great.
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