Heart Rate Query

I have a pretty low heart rate, around 55 BPM.

 However, after say a half hour of fairly intensive exercise, although my heart rate drops quickly from say 160 BPM back down to under 100 BPM, say within a matter of 2-3 mins, it takes almost 2 hours for it to return back to 60 or below... say between 15 -120 mins after, its still elevated to around 70-75 BPM...

 Is this normal? It seems strange...

Perfectly normal Bob.

You'll typically register your lowest resting heart rate when you first wake in the morning - provided it's a 'gentle' awakening.

Bob,

How old are you?

If I've done a long run (16-18miles) my heart rate is affected all day. It stays a little higher than normal and rises quickly if I have to do anything strenuous.

I'm no expert but I think that this is quite normal.

hey, thanks for the responses, you've put my mind at ease

 I'm 26, and I'd say I am reasonably fit for my age, tho am improving all the time since giving up my vices...

 U run 18 miles jon?? thats hardcore