Unusually (dare I say freakishly?) high heart rate?

I ran about a mile today after having had very little regular exercise for a couple years. About half way through the run, I started walking and measured my heart rate. In five seconds I measured 15 beats, which I believe translates into 300 BPM. I measured two more times, and I had 15 on the second measurement and 14 on the third.

For the sake of hypothetical argument, let%26#039;s assume I measured accurately. (I may get a heart rate monitor to look into this better.) Is this kind of heart rate even possible?

I was really tired after my brief workout, and the music on my iPod sounded slower (which is actually normal for me during workouts), but other than some back pain, I didn%26#039;t feel anything unusual.

Unusually (dare I say freakishly?) high heart rate?

Fibrillation is defined as a heart rate higher than 350 beats per minute. Since you felt fine, it%26#039;s possible you were feeling double beats which often are not a sign of any problem. You could also have been feeling not only the beats in your neck, but the beats in your fingertips, increasing your total count. You could purchase a simple wrist heart monitor to wear while you exercise and check it%26#039;s recordings. But to be extra sure you could ask your doctor about getting an EEG or even a Holter monitor. It is worn for 24 hours continuously recording the heart rhythm.

Unusually (dare I say freakishly?) high heart rate?

I would have to get that checked out