I know caffeine and other stimulants affect your heart rate, but how much can a few cups of coffee raise you're max? I usually top out around 195 bpm, but I've gotten up to 205 when I was really, really wired hitting a big climb.
Does that sound realistic? I haven't really experienced radio interference with my HRM in that area before, but it could be a bad reading. Also, is something that raises your real-world max HR by 10 bpm even safe?