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Heart Rate Danger Zone?

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Hey Folks,

Is there any level of Cardio that would be deemed unhealthy for a mans heart? This man is in his late 20s and is 70 lbs overweight. In my late teens and early twenties I was able to run very efficiently, about 48-56 miles/week in 6-7 hours. Since then I've endured an injury which confines me to the elliptical. I had a long lapse (3-4 years) of relative inactivity. Since my latest venture to re-attain strong fitness levels, I have noticed that my lung capacity and strength has weakened considerably. This was to be expected. What I hadn't anticipated was that my non-tangible traits that made me a solid runner have remained intact. Determination, drive, will... Whatever you may call it, I still have it. I find myself running the heartbeat monitor up around 195. I'm able to sustain and function quite comfortably other than the anxiety it causes me when I start realizing how many beats that is.

My Question: Is it safe for a late-20s male, 70 lb over weight (or ever for that matter) to exercise at ~200 BPM for an extended period of time 30-60 mins, assuming this person feels good while doing it?

PS My blood pressure is a bit high, 130/90 on occasion.
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replied March 31st, 2012
In a manner of speaking this is a rather ridiculous question, because this young man obviously understands that he is significantly overweight. Therefore, one appropriate bit of advice is for him to lose weight. Such a positive move would probably result in normal blood pressures and he would obviously be more fit.
I am more interested in levels of exercise achieved than in pushing to high heart rates, and tend to avoid high heart rates for prolonged periods of time like one hour. It is hard to decide what is "safe" without having more detailed information (for example, what was the injury that was sustained?).
Physical fitness includes the ability to perform work, but it also includes body composition (is the person overweight?).

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