Heart rate shoots dangerously high

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im a fit 18 year old you goes to the gym 4-5 times a week, my resting heart rate is around 74 but if i do any cadio ( fro exaple 10 mins speed walking on the treadmill) then my heart rate shoots up to 212.

I know the max you should allow it to go is 220-your age (so for me 202) so i stop when it goes crazy high. I dont feel dizzy when it goes about 200 and in fact when it does it the only time in my workout that i actually start to sweat. I have no idea how to fix this, i have done all the stop and start cardio that i can think of and still my heart rate shoots up. Any one have ideas? should i just keep pushing past it and igore how high it goes?

I don't smoke, nor do i have any known heart of lung problems. 


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    Forget 220-age. It's a statistical average. Actually, during stationary bike lessons with the HR projected on a wall I witnessed 3 out of 20 people were close to that number, 14 were about 10% higher or lower, and 3 were more than 10% higher. Actually, my HRmax is at around 210, while it should only be at around 178 per above equation. How fast your heart beats is genetically determined.

    If you can still talk then you're not training too hard. If you cannot talk anymore then you're still not training too hard because then you've crossed across the anaerobic threashold, which happens at about 90% of your maximum heart rate.

    Thus train at a difficulty that is difficult for you, as you don't get fitter from walking the same distance at the same speed again and again. Build in variation: sometimes longer and slower, sometimes faster and shorter. But make sure your heart has something to do.

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