On a 6-mile run during 2010, my heart rate was 211 (documented by a Garmin GPS trainer).
In 2005, I "failed" an EKG at an urgent care, according to the incompetent nurse. They referred me to a reputable Cardiologist in the area. The cardiologist asked, "Are you a cardio-freak?" I'm not one. I do jog, but not efficiently. My feet, ankles, knees, hips... have always been off and my gait is not efficient.
The Cardiologist told that my heart rate was unusually low, 41. He said that as long as I'm exercising and I feel ok, that it's a good thing and I should be fine.
The Cardiologist concluded that I had contracted and survived meningitis from being in the ocean at Imperial Beach which is just north of the murky Tijuana river. His wife had contracted it while she was pregnant so he was very familiar with the cluster, intensity and duration of specific symptoms associated with meningitis.
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think... "Little Circles"