@Boxeri: I have never heard of such a thing either, that's why I'm eager to try it.

Thanks for your hints. I've had a cold (maybe TWAR) for 4 months and haven't run since september. When I run I use a globalsat sportswatch with gps. The hrm is malfunctioning so I barely never use it.Therefore I have never really been accustomed to what my runningpulse measure. :-)