GO TO THE DOCTOR! Get a stress test specifically on the treadmill, don't just talk about it. Heart rate should climb some then level out unless you increase intensity. So if it is jumping that high during your run and you aren't changing speed or incline to cause it, then the doctor is your safest bet.
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A bit of background: I've been running/jogging on the treadmill fairly regularly for about 3 months now. During that three month timeframe, I've worked my speed up from 5.0 mph pace to 6.0 mph pace. It's obviously been a fairly slow increase in speed, and I feel that I wait until I'm really ready to move up each time I do. I've always kept my runs between 20-25 minutes with a 5 minute warm up and a 5 minute cooldown. Although I've been running at a 6.0 mph pace for a couple of weeks now, my heart doesn't seem to like it. My breathing is fine, to the point that I could probably carry on a conversation throughout my run pretty easily. However, each time, my heart rate skyrockets about 15-20 minutes in. I get a slight pain in the area of my heart, and when I use the heart rate moniter on the treadmill itself, my heartrate is close to 200 bpm. I know that's above what is recommended, and wonder how harmful it may be to allow it to be that high. Also, is there anything I can do to make my heart stronger so I don't get held back in my training due to heart rate? I feel that I could probably bump my speed up again soon, but I'm afraid to do so because of this. Any thoughts or advice would be greatly appreciated!
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