OK guys, thanks for the comments and I will try to answer some of the points raised.
1) The good old manual test. Of course I did that while OFF the bike. My HR was near normal both measured with the HRM and manual. BTW I do not have a very strong signal for a manual test.
As I go on the bike and bike a reasonable speed, the HR starts accelerating up over 200. I tried but did not succeed in testing manual while pedaling the bike. As someone said: I was somewhat freaked out.
2) It is a Polar HRM. A electromagnetic interference is the most likely explanation IMHO.
3) You can have an joke on me. I still use German English every so often especially when I write something. In German Chest is called "Brust" and NOT gender specific. They have other names for gender specific Chest. I had a slip up to translate that "Brust" into Breast and had to think hard what I did wrong.
Last edited by will dehne; 01-27-09 at 06:26 PM.