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Old 09-14-08, 06:43 PM
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If you are using the "220 minus your age" formula, then there's your problem, it probably comes out too low. Ideally you should do a max heartrate test, but if not then one of the better calculators is the Karvonnen formula which is based on your age and resting heart rate.

The max test is really the best way to go though. A friend of mine found out that her max HR is actually 220. She wondered why she never felt tired at the 220 - age levels.
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