In reply to David Bennett:
This whole topic seems like a dark art to me. My layman's suspicion is that the input factors into tendon healing are so complex - lifestyle factors (stress, sleep quality, etc), non-climbing strains (RSI at work, etc), nutrition, hydration, etc, etc - that no medical professional's advice can be expected to "work" in a straightforwardly causal way. Worse, the person I know who suffers most from tendon issues is also a very experienced and wise physiotherapist ... But FWIW, especially as we are about the same age, these are two recent experiences of mine.
Last August I experienced a nasty inner elbow tendon problem in my right arm after doing some lock-offs when unwarmed up. I then exacerbated it - I think - by doing too many dips in my company's new gym in early September. For the next two months I went from bad to 90% healed via a classic sequence of complete rest (2 weeks), reversion to climbing after promising improvement, relapse and more rest (1-2 weeks) and so on. I also bought some light dumbbells and did a lot of reverse wrist-curls. It's all lovingly documented at this site on the Fit Club #24 to #33 threads. One weird aspect of this period I noticed is that "tough-love" therapy - going out and climbing far too much all day - had absolutely no correlation with immediate after-effect and if anything seemed to accelerate recovery at a key point (perhaps in some subtle way a decent level of "abuse" is necessary to persuade the body to start rebuilding the collagen?). By mid-winter - prime season in this part of the world - I was stronger than I have ever been and redpointed a first ascent project that's unquestionably the hardest thing I have ever done.
Recently, though my climbing intensity is pretty low, I have started to get persistent aches at the inner elbow insertion point in both elbows. I'm really sure that the major aggravating factor, if not actual initial cause, is that we had a second child in February and I spend a vast amount of time carrying and moving him. It seems absurd as even now he only weighs 7Kg but the muscles get engaged for long periods at a time, often without any warm-up (ie middle of the night!). I am hoping that the two months I'll have off baby duties this summer will therefore allow some recovery. We'll see ...
Slightly off-topic but one other injury avoidance practice I have adopted that I suspect to be worthwhile is to switch my mouse arm at work every few weeks. I believes this helps avoid RSI-type problems at the shoulders and elbows, even though the actual physical loading is very slight.