Yesterday I rode so hard that my MHR was at 102% since I had set it to 187bpm but was at 191bpm... I guess I have a new maximum? Or maybe even more than that? I felt light headed big time.
Good news is I thought I was riding with the B group but after we finished I found out I was with the B+ . That made the suffering almost worth while.
Here's the data -
http://connect.garmin.com/activity/81625607