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In a very active and physically fit person at rest-could be normal though rare. Usually a heart rate of 40 is present in some forms of heart block. Normally, a heart beats at an average of 60-100 beats per minute but this can go lower or higher based on exercise, stress, physical fitness, stress, etc. This heart rate is controlled by a "focus" in your heart, a natural pacemaker (the right atrium). If this fails, your heart does have other options to keep your heart rate going. A heart rate of 40 is usually originating from the ventricles, and is a form of an "escape" rhythm.

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Q: Causes of 40 range heart rate?
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Maximum heart rate is determined by 220- age, if 40, the maximum heart rate would be 180. Heart rates in the range 190-200 often cause nausea, headache and vomiting.


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