Exercise Tachycardia at beginning of run

I am a 62 year old marathon runner (48 marathons in 30 years).  When I first got a heart rate monitor a few years ago, I noticed that my heart rate in the first mile of my runs was in the 200 range and then would fall to 130 after that and stay there.  I thought it was due to EMFs or something of that sort.  Now I have a Garmin 305 that produces a graph of my workouts on my laptop when I download my workouts.  I consistently have high heart rate in the first mile or so, and then it drops to normal levels and never returns to the elevated levels.  Recently I ran a marathon at a good clip.  During the first mile, my heart rate was around 200.  After mile 1, it dropped to around 150 and stayed there the entire run.  I have no symptoms.  I feel great in the first mile, and I do not push the pace until after I get warmed up. Even though my slower training runs, the heart rate is in the 170 to 180 range during the beginning and subsequently drops to the 120 to 130 range.  Is this common, and is it benign.  Or do I need to see a cardiologist?  

[Jerry_NJ]

Well your physical condition is far beyond anything I can imagine, but at age 62 you upper heart rate numbers look alarming to me.  For that reason alone I suggest you discuss your training and competition experience with a Cardiologist.  

That said, I'd say "second wind".  I have never run more than 3 miles, but even with that I have pushed myself hard enough to "feel" the "second wind" effect, that is a feeling of refreshment and more energy and wind.  I have never noted a drop in HR,but then I wasn't looking either.

What do you think about the human body getting a "second wind" effect after the first mile or two in a run?  I mean it is something very normal, at least for those who put out that level of physical exertion.

[42krunner]

My 150 plus heart rate during competition is normal for me. As a matter of fact, I can sustain 160s.   It's low compared to when I was younger.   Of course, I'm slower.  When you do aerobic conditioning for over 30 years, it is not unusual to be able to sustain a high heart rate during continuous physical exertion.  As long as my breathing is relaxed and rythmic, I am ok.  However, the 180 to 200 heart rates during the first mile when I feel like I'm not pushing it very hard during the first mile is disturbing.  Of course, I have discovered that this has been going on for some time, and I'm not dead yet and have never had any symptoms at all.  Regarding a second wind after the first mile, I think I can help you with that.  When you first start out, your body is adjusting.  Once you are warmed up, you should feel better, providing you don't go out too fast. If you have labored breathing the first mile, start out slower and ease into your run.  If you do this, your pace should automatically get faster after about 1/2 mile or so.  Thus, your second mile will be faster without even trying.

[smco]

I have also noticed a high heart rate on my Polar monitor during the beginning of a run.  I think this is due to poor conduction of the transmitter.  You can purchase conductive gel from a sports catalog that sells heart monitors which should prevent this.   This increase is roughly 1/2 the actual rate high which sounds close to what you are seeing.   Unfortunately, in my case I see very high rates after a period of exercise which is AFIB unsustained. A 24 hour Holter monitor test will confirm a normal heart function.  I pushed as hard as I could on an exercise bike to see some very interesting data that frightened my primary care physician and led to a lot of additional testing.  I think a stess test or Holter with exercise would not be a bad idea for an older runner to validate proper heart function.  
   I have 4 friends, all over 45 years old who have also developed arrhythmia and somewhere I read that endurance athletes with resting low heart rates are 5.5 times more likely to develop arrhythmia problems.  Hope you don't join this club.

[42krunner]

Thanks for the advice.  Despite some new "better news", I am going to get a full cardiac check up, which I have never had.  Yesterday I wore a cotton shirt to my local fitness center.  I lathered the transmitter well with water and hopped on the treadmill.  I took it easy the first 1.2 miles (5.1 mph) and then increased the pace every 1/10th mile until I was running 8 mph (7:30 pace).  During the entire 1.2 miles, my pulse ranged between 131 and 132, except for a brief period of increase at the beginning.  My pulse followed a steady curve on the graph to a maximum of 168 (too fast!).  Then I cooled down at 6 mph where my pulse dropped to 148 and remained fairly steady.  There was nothing unusual at all recorded on my Garmin 305, which is only two weeks old.  I am starting to believe that it is due to not adequately lubricating the transmitter.  Hopefully that is the case.