In reply to tomaspkr:
I suspect it may be the opposite. Sometimes people talk of a "ping pong" problem effect caused by going up and down too much. Don't know if there is any scientific basis for it, but there is some logic that going up and down repeatedly, changing the conditions your body is trying to cope with might confuse it and actually be counterproductive.
But I don't think this stuff is well understood, so really it's all conjecture. Probably, simply whether you acclimatise well and can cope with sudden altitude changes particularly well is the key. Everybody is different and even the same person can acclimatise completely differently on different occasions... I think you have to just try stuff and figure out how it works as you go along - but being aware that the repeat up and down could be unhelpful rather than helpful may be no bad thing.
Post edited at 23:12