Prolonged periods of high heart rate after exercise

[soflsun]

I am a 30 year old male.  I have a low resting HR and high exercise HR.  In addition, my pulse stays well above my resting HR after exercise, sometimes staying at 90-110 BPM for 4-6 AFTER exercising.  My normal RHR is anywhere from 48-60.  My exercise HR climbs very quickly, relative to my conditioning, and I often take it easy just to keep my HR from climbing too high.  The condition seems to be worse the longer I exercise.  Meaning, the elevated HR lasts longer if I exercise for 45 minutes as oppsed to 10-15 minutes.  Weight training seems to exascerbate this more as well, since my heart rate tends to be higher during these workouts (stays very high for the entire workout).  My doctor doesn's have an explanation for why it would stay elevated for so long in an active person.  EKG and echo are normal.  Thanks.

[soflsun]

I just a bit tired of docs saying everything is OK when they can't actually give you a reason for the symptoms.  My doctors exact words, "Yes, that is strange that your HR stays that high for so long, normally athletes heart rates return to normal pretty quickly."  Great!! Thanks Doc!!

[scouser costa rica]

I would suggest seeing a Cardio or an EP. I had this problem and it ended up being a combination of Sick Sinus Sydrome and A-Fib. Now am on medication and have no more problems. Or it just be nothing,HRs are strange things and vary from person to person,also this was diagnosed when I was 62, 10 years ago,although I have probabley had it all my life. I was a high performance biker in my youth,but we knew nothing about this stuff in those days. No pulse monitors those days, and as for A-Fib, just rode through it.
            Regards Ian

[soflsun]

Yes, that's 4-6 hours for normal resting HR to return.

[Jerry_NJ]

Interesting, and given a doctor has no idea, how can I even guess?  Well here goes anyway.  

You have a very low rest HR, in my experience, thus I'd guess your heart would accelerate (HR) quickly when you start exercise, it was "running" in a just enough mode.  Next, a HR of 90+ for some period of time doesn't strike me as unusual either, especially if you are still on you feet, not resting.  

Now a question, you said: "4-6 AFTER exercising"  what is the dimension?  If minutes, sounds fine to me, if hours, that seems too long to me for a HR returning to the rest rate, again if you are really resting.