Originally Posted by VintageCommute
It's strange. Supposedly after a long arduous physical exercise like biking, you should have felt refreshed.
This is true but muscles need time to rebuild otherwse they get overused/overtrained. The HRM let's you know when your heart isn't keeping up with the demand. You've suppposed to cycle within a zone but while commuting it distracting... I just have mine beep when the HR goes over the limit for too long.