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My target heart rate for endurance training based on my age is about 135 beats per minute. Do I have to take into account, that I have a low resting heart rate or is that irrelevant. My resting heart rate is only 45 beats per minutes. Does this also lower my target heart rate?

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how did you come up with 135 for your age? –  Ryan Miller Sep 4 '11 at 12:54
    
If you really want to know YOUR specific threshold/zones for training, you'll want to get a lactic threshold test done. Any other method/formula (except field testing) is slightly better than guessing. –  Ryan Miller Sep 4 '11 at 12:55
    
@Ryan: From the first diagram in this thread - fitness.stackexchange.com/questions/1015/… I am currently 30 years old. –  Demento Sep 4 '11 at 13:29
    
Yeah, I figured. Charts like those are estimates at best. It's enough to get you started, but if you are training for an endurance event, I'd go a different route. –  Ryan Miller Sep 4 '11 at 15:49
    
These links may provide some info fitness.stackexchange.com/questions/272/… thewalkingsite.com/thr.html –  Joe Blow Sep 4 '11 at 17:15
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The Karvonen Formula shows you how to calculate your target heart rate taking into consideration your resting heart rate and your heart rate reserve.

Karvonen Formula: (MHR - RHR) x _% + RHR = THR

MHR is your maximum heart rate and is calculated by: MHR = 206.9 - (0.67 x age) (This a newer formula than the old 220 - age).

RHR is your resting heart rate.

THR is your target heart rate.

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This would mean a THR of 144,26 for me. Sounds reasonable and would fit into the diagram in fitness.stackexchange.com/questions/1015/… for my age. –  Demento Sep 4 '11 at 19:48
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