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Long term effects of running marathons in predominantly anareobic metabolism with occassional tachycardia

I have been running/training in marathons for the last 5 years   (one marathon a year).  In each of my training years I have never had incidences where my HR went above 200 BPM.  When I was stressed it would hit 183-189 at the peak.
However this year I started taking an over the counter melatonin sleep aide and I wonder if this could be a causitive effect on this years training (I observed on three weekends where my HR went at or above 200 BPM, the last one lasted around 2 minutes long).

Any inputs:  Thoughts?
1 Responses
1803629 tn?1323451126
In general, the recommended peak heart rate during exercise is 85% of 220 minus your age.  Of course this is a generalization and some people are able to safely exercise at a higher heart rate. The question regarding the safety of your elevated heart rate prompts another question of whether or not your heart is still in a normal rhythm when it is going that fast or if you have gone into a supraventricular tachycardia (SVT).  For a more definitive answer, I recommend a consultation with a cardiologist who could possibly order an exercise stress test to determine if you have episodes of SVT when you are at maximal exercise.
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