About one month ago I started running every couple of days after being completely sedentary for ... well, essentially my entire life. I'm 23 years old, 5'11", 155 lbs, never done regular physical activity of any kind before that (except gym class, lifting a few weights every now and then, etc.)
I'm 100% healthy, but I have noticed that my heart rate seems to be a bit unusual. My resting heart rate is fairly low at 55 bpm, and when I run I can stay between 180 and 190 bpm for a fairly long time (at least 45 min). Today, after a 30 min run at 185 bpm, I tried sprinting for the first time (for like 5 sec), and my heart rate went up to 210 bpm. Somewhere between 195 and 205 must've been where my body crossed the lactate threshold. I then slowed down and went another 15 minutes at 190 bpm, all without any uncomfortable physical symptoms (like nausea, dizziness, or something).
Please assume my heart rate monitor is correct, if only for the sake of argument, since I've tested several and they all give identical results. Also, my heart rate doesn't seem to fluctuate abnormally, so irregular heart beats or PVCs are probably not the reason.
Having said all that, I'm definitely not some sort of super athlete: The speed at which I'm running with this heart rate is not high at all (about 10 km/h at 190 bpm) and my performance overall is not great.
My question is what this means in terms of my physical fitness, if it means anything. I'm not asking a medical question here, my heart is completely fine, which has been confirmed by doctors.
Does it mean that (a) I'm unusually fit, (b) I'm unusually unfit or (c) it doesn't mean anything and only performance counts? If it's (c), and it doesn't mean anything, I'd still be curious why my heart rate might be so unusual. I know that noone here can give me a definitive answer without further details, but maybe someone wants to venture a guess.