Originally Posted by
Ygduf
speed = distance/time. distance = integral(velocity). both rolling and wind resistance increase with velocity, so very simply it's best to expend your energy in the "slow" parts, be they uphill or into a headwind. More speed-bang for the watt-buck, so to speak.
Accelerations out of corners and turnarounds too. You pretty much want to minimize any of your time going slow, and maximize your time going fast (which sounds silly, but is pretty much what we're talking about).
Originally Posted by
Ygduf
how much over threshold vs. under is going to vary with each rider.
It's also going to vary with each course and each gust of wind.