p.s., I throw a PVC here and there when exercising too. Neither of us has died yet!
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.
i had several palps while exercising very scary
i was doin kinda low impact thing riding a exercise bike and i got up to about 140 and after 1 min or so it fell to 120s then it stayed there for 4-5 min at ten min it was 106 now at 15-17 min its 98
i get very nervous when my heart rate goes up even if i'm exerting myself it just makes me nervous
Recovery to what?
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.