Posted: 22/10/2014 at 20:36
I think it all depends on your training. I've definitely sacrificed speed since getting into ultras, but then most of my runs are long and slow, so what do you expect. Those who continue a more marathon based training regime, with tempos and speed work, probably hold on to their speed a bit better.
I've heard the advice of flipping the usual winter base period, in season speed work, for ultras, as all race season is pretty slow by definition, so the off season is the time for speed and strength. If that makes sense.