Some meds will give you a higher max HR too. A year and a half or so back I started taking adderall to try and help some of my ADD issues (ADHD if anyone needs the currently accepted acronym, I'm not disposed to the "H" though). The adderall pushed my max HR up about 8 plus BPM. I routinely hit 185 or more with it. Probably any amphetamine will do that, legal or illegal. I didn't like it though so I got off it after about 9 months and my HR returned to what it had been before.