Probably nothing: Heart rate varies with respiration normally. It is usually not sensible however. A low heart rate may be a normal occurrence in a conditioned person, however if the low heart rate causes fatigue, dizziness or passing out episodes, it needs to be evaluated. Usually, a treadmill stress test is done to see if the heart rate responds appropriately, if not, the person may need a pacemaker.
Answered 6/24/2015
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