If you go back to the forums page you will see on the right the expert/Doctor forums check out the heart rythum forum good luck..if you run so much you are doing pretty well.and .running in races, good for you ..
The problem is, with rates below fifty, the atrial pacemaker is not working. Usually this is because there is dead tissue (an infarct), however the atrial pacemaker may be destroyed. Your rate indicates you are on the back-up pacemaker site. There are rare exceptions to this, but normally a rate such as yours does not come from the atrial pacemaker site. The rate comes from the last-ditch-emergency back-up site. If this is the case it makes good sense to get a demand pacemaker while you are still relatively healthy.