Thanks again.
Incidentally I was out the other day and didn't have these problems on a sport warm-up route. It was about the equivalent to 5 TCA problems (hence exhaustion zone), and also slabby (so if it was a leg issue that should have worsened it), but no problems. The main differences I could think of: climbing much slower, breathing normally, and being physically a bit more warmed up from the walk-in (although I don't have the issue at Ratho - no walk-in warm-up there).
I think there are a few things I can try:
Climbing slower during warm-ups.
Focusing on my breathing.
Eating something useful before session.
Testing doing rapid easy problems after warm-ups to see if it's a general issue.
Doing a general physical warm-up first.
At the end of the day it's something that's worrisome rather than actually screwing up the climbing that matters. If it comes down to being an unavoidable issue and I just have to do a slower warm-up with more rests, sobeit.
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Now then DVT stuff (no problems about discussing this stuff, I didn't mention it in detail cos I didn't want to waffle on about it unless it was useful):
I have a congenital aplasic IVC, this was only diagnosed after having DVTs (and a billion other tests because no-one knew what caused them). I'm on warfarin for life due to being high risk from the IVC. My pelvic and iliac veins are completely sealed from the DVT clots, and the collateral venous return is obviously poor. This generally only affects running and uphill walking, both of which exhaust me after a few minutes (legs full of deoxygenated blood, heart and lungs struggling to cope), but I recover quickly once sitting down (blood replenishes everything calms down). I think I'm working at about 25% of leg "fitness" now. Other physical aspects seem unaffected, especially climbing, hence the confusion about the warming up.
i am no expert but i guessy this may be a consequence of decreased venous return as you will be increasig your intrathoracic pressure when trying hard, which you won't to the same extent if rumbling up a 6a or swimming, and the heart will be able to catch up to push the blood round (might be worth checking your pulse - it is surprising how high it goes whilst bouldering compared to say rumbling along on an exercise bike)
Sounds interesting, the intrathoracic thingy, that's what I mean about this not being an issue when trying hard after warming up.
