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Is it safe to do intense cardio with tachycardia and PACs?

I've started working out every day pretty intensely, as I'm trying to get very strong. I'm a seventeen year-old girl, and I was recently diagnosed to PACs and tachycardia, much to my surprise. I was completely unaware of these conditions until I went to my annual physical (which was the event my doctor discovered the conditions), two specialists, and had to wear a holter monitor for a day. My heartbeat is usually around 120, but the holter revealed it fluctuates anywhere from 56 to 173 BPM when I am not exercising. I have no idea how fast it goes when I exercise intensely or even at all.

Basically, I want to know if it's safe for me to be doing intensely strenuous exercises and intense cardio. I really want to be super strong and fit, and I know there are certain limits of mine involving cardio. Ex: I can't run a mile in under ten minutes because my heart prevents me from being able to breathe enough. But I use the stairmaster regularly and do intense muscular workouts, and I just wanted to make sure I'm not putting myself in danger.

Thank you. :)
2 Responses
144586 tn?1284669764
You pose a very interesting question, that should be addressed by your cardiologist. There are several different reasons for a high heartrate. It could be something as simple as a magnesium deficiency. Sometimes medications can treat the condition. I would er on the side of caution, but I would try hard to get a second or a third in-person opinion from a spedcialist.
12492606 tn?1459877633
It is great to see that you are so fit and healthy.  However, there is an optimal point where more exercise doesn't add to your fitness and in fact damage your heart.  Each person has their own optimal point.  Overdoing it would be just as damaging as smoking and diabetes.  I had a co-worker friend that ran marathons because he wanted to keep healthy and because there was a history of heart disease in his family.  He died suddenly from VF two days after a marathon while in a meeting.  I wasn't there but my other friends tried to resuscitate him with no luck.  Back in those days, there were no defibrillators in the emergency kits.  The following article and TED talk is from a doctor that is also an endurance athlete regarding this issue that you raise.

http://espn.go.com/sports/endurance/story/_/id/13386980/velonews-endurance-athletes-damaging-their-hearts
https://youtube/Y6U728AZnV0
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