I hazard the guess that if playing a computer game is enough to spike your adrenaline, then you should wait until you're out of nappies before you go running in the dark. 
Because playing is only for babies. I get it.
Bizarre idea.
1) Your training would probably benefit more if you spent the time you were playing resident evil either running for longer or doing some other cross/strength training.
I think even the most committed runner is allowed (nay, encouraged) to take some time off from training.
And bear in mind, this is a hypothetical question. I was just wondering if heart rate per se was the important factor, or heart rate was just a proxy for effort being exerted.