Maybe, or not: Could be external influences (caffeine, stress, other meds/supplements, etc.), or internal (fast metabolism, body shape, etc.). Also, not everyone with hr=55 is a marathoner, and not all marathoners have hr=55. Should ask your dr at next regular visit for once-over and opinion, though.
Answered 6/22/2013
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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