new high

so check this out...
Yesterday during CX practice I was trying to keep up with these 3 guys and while doing so went all out, I mean all out for a while. I knew I was going to blow up so I backed off and was worn out. When I got home I checked the readings on my heart rate monitor and my high hr was 188, higher than I have ever seen and higher than my predicted heart rate based on my age, 187. I have been using zones based on that and on my maximum steady state high hr of 169. Both have been superseded this week. Even though, it is only a beat or two, it's kinda exciting and I'll be changing my training zones accordingly.