Low resting heart rate

I am a 36 year old male and my restin heart rate for as long as I can remember (teen years) my resting heart rate has been low.  I mean in the 38-48 bpm range.  My question is this, I work out and run, but not an abnormal amount and I am by no means a world class athlete, so is this something I should worry about.  When I work out my heart rate rises and falls as it should, but I was just wondering if this is something I should be concerned about...thanks

Matt

[inharm]

I heard of a swiss biker that came to my cardio doc with a rate around 20 bpm.  I don't think that I would worry about your low rate.  If I did worry, I would ask a cardio doc. Jim Ryan the miler had a resting heart rate in the low 70s and he set records in his distance.  Other runners have a resting rate much lower.  Go figure.