Road Bike Racing - Normalized Power ?

To you guys using power; Do most of you change your FTP when you see an upward move in your 60min NP? I have had my FTP set at 305w for quite awhile, @ 5 weeks ago I had a 60min NP of 307w in a race, then yesterday I was on a group ride were I had a 60min NP of 310w. I guess my understanding of NP is not clear enough to know the answer to this, so any help would be appreciated.

Personally I don't, I wait until I see a change in a more steady-state interval.

But if I had a FTP set at 305, and for some workout/reason I thought it had moved to 310, I probably wouldn't bother changing it anyway.

^^^^^ +1

I think that a 60m NP of 5% more would indicate that you should test again. Otherwise, stay on your current testing schedule. If you feel that your training zones are getting a bit too easy, try bumping them up 10W or so, and nail it down after your next test(s).

Thanks guys, I appreciate the info, should have realized myself that it is a pretty insignificant increase in the overall.

Never. You want to know where your FTP is? Test it. 1hr ISOpower.

To quote the very knowledgeable Dr.A.Coggan:
"Andy Coggan's Seven Deadly Sins
How to determine your Functional Threshold Power (roughly in order of increasing certainty):

1/from inspection of a ride file.
2/from power distribution profile from multiple rides.
3/from blood lactate measurements (better or worse, depending on how it is done).
4/based on normalized power from a hard ~1 h race.
5/using critical power testing and analysis.
6/from the power that you can routinely generate during long intervals done in training.
7/from the average power during a ~1 h TT (the best predictor of performance is performance itself).
Note the key words "hard", "routinely", and "average" in methods 4, 6, and 7... "

+1 to the one hour test. I coach and have compared it to lab results and find that it's very effective. 30 minutes for HR threshold will work very well too.