What causes an abnormally high heart rate, and what (if anything) is there to do about it? My girlfriend is 5'4, 120 lbs and has a resting heart rate of around 100-130. WTF? she's been to the doctor and they've never really said anything about it. She drinks a lot of caffeine but even on days when she's not drinking caffeine or hasn't had any for a week or two its still real high. She doesn't get that much excercise, but she's informed me that even when she did dance in high school it was still pretty high.
any advice? she says sometimes it gets really high when she's lifting or doing cardio and she has to stop till it cools down. Like today she was on the elliptical and it was up to 205 O__o.