I am a young 22 yr old girl. I work out about 4 times a week and am not over weight. I have always known that I have a high pulse rate. When resting it is around 100 to 110, which is fine to me. But when I exercise my heart rate increases to 150's or 160's without sweating and it is a light to moderate exercise. When I do exercise heavily, I begin to get out of breath, and sweat. My heart rate goes up to 180 or 190 and I can feel my pulse in my head, and I get light headed and dizzy. My trainer noticed this and told me to slow down to 150, which is walking for me. And now I don't feel like I am getting any exercise. My pulse rate drops back down to 110 after 15 to 20 min of resting after exercising. I am going to the doctor soon, but wanted to know and understand more about high heart rates, and whether or not I should be worried.
I think you need to give you body more time to condition itself to exercise. Follow your trainer's recommendation, but push it a little. Say work at 150 bpm limit for a week, then step it up a little and run at 160... and so on. Nothing new here, this is how one gets in "condition". Given you young age and your history of a higher resting HR I'd think when you are in good condition there's nothing wrong with you working out at a HR of 180.
I used to push a HR up to 150 when jogging when I was in my mid 60s (years old). That's very near the maximum of 220-age, and I had no problems... well I do suffer for AFib, but that was not caused by exercising. My AFig got bad enough about 18 months ago that I stopped jogging, and I do miss it, and so does my waist line.
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