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...

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